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Update using subquery with group by

Tom Kyte - Tue, 2016-08-23 16:06
Hi Tom I have a table with 18 million rows. I need to do an once-off update to fix a data issue. CREATE TABLE TESTLARGE(CODE number, STATE varchar2(5), SDATE date, flag char(1)); This table does not have any primary key enforced. I have t...
Categories: DBA Blogs

problem with a few chjaracters in JAVA / JDBC that cant be converted from source 9i solaris DB to a 12c linux system

Tom Kyte - Tue, 2016-08-23 16:06
Hello Tom, 1.what is the right superset for WE8DEC?? 2. what OS charset (say I would it set in my java program) should by set if I want to read varchar fields and write them in a new varchar field? Apart from this they received "ORA-29345:...
Categories: DBA Blogs

DBMS_STATS.GATHER_TABLE_STATS Gives wrong row count (NUM_ROWS column in user_tables)

Tom Kyte - Tue, 2016-08-23 16:06
Tom, I am a big fan of yours and you are awesome. Here is something I observed today. I always thought analyzing table will populate number of rows in user_tables.num_rows column. I have a table with 204,913 records. When I do a select count(1) fr...
Categories: DBA Blogs

dynamic pivoting

Tom Kyte - Tue, 2016-08-23 16:06
Hello, I have a table something like this: book name| chapter| sub-chapter | no. of pages| book1 chap1 sub_book1_a1 230 book1 chap1 sub_book1_a2 110 book1 chap1 sub_book1_a3 220 book1 chap2 su...
Categories: DBA Blogs

ORA-01410: invalid ROWID

Tom Kyte - Tue, 2016-08-23 16:06
Declare Cursor C1 is select * from emp; Cursor C2(P_deptno dept.deptno%type) is select deptno,dname,loc from dept where deptno=P_deptno for update of dname,loc; dept_Rec dept%rowtype; i emp%rowtype; Begin Open C1; loop Fetch C1 into i; Exit...
Categories: DBA Blogs

alias to a non named column

Tom Kyte - Tue, 2016-08-23 16:06
Hi Chris and Connor, How can I give an alias a non named column resulting from a subquery? the case select * from ( select 6*7 from dual ); I know it's easy to alias it in the subquery like that select result from ( select 6*7 as ...
Categories: DBA Blogs

Oracle Materialized View Fast refresh on remote database

Tom Kyte - Tue, 2016-08-23 16:06
GM Tom, In my current db implementation, we do not have any data/tables in our db and gets all data from two other data sources. To do so we have created Materialized Views using dblinks to get data from these two other db sources. We use to COMPL...
Categories: DBA Blogs

Force Query to use a hash plan

Tom Kyte - Tue, 2016-08-23 16:06
Hi Tom, I have SQL HC for a SQL ID which shows the query have two Hash Plans one is Optimal and another which elapse a lot. And my query is taking long time to run which means that it is using the worst plan. I want to force my query to use the O...
Categories: DBA Blogs

Real World SQL and PL/SQL: Advice from the Experts

Chet Justice - Tue, 2016-08-23 15:10


Because my hero is Cary Millsap, I'm going to do what he did and publish my foreword Preface. All joking aside, I consider myself incredibly fortunate to have been included in this project. I learned...a lot, by simply trying to find the author's mistakes (and there were not many). There was a lot more work than I expected, as well. (Technical) Editing is lot easier than writing, to be sure.

Brendan Tierney and Heli Helskyaho approached me in March 2015 about being an author on this book, along with Arup Nanda and Alex Nuijten. Soon after, we picked up Martin Widlake. To say that I was honored to be asked would be a gross understatement. Rather quickly though, I realized that I did not have the mental energy to devote to the project and didn’t want to put the other authors at risk. Still wanting to be part of the book, I suggested that I be the Technical Editor and they graciously accepted my new role.

This is my first official role as Technical Editor, but I’ve been doing it for years through work; checking my work, checking others work, etc. Having a touch of Obsessive Compulsive Disorder (OCD) helps greatly.

All testing was done with the pre-built Database App Development VM provided by OTN/Oracle which made things easy. Configuration for testing was simple with the instructions provided in those chapters that required it.

One of my biggest challenges was the multi-tenant architecture of Oracle 12c. I haven’t done DBA type work in a few years, so trying to figure out if I should be doing something in the root container (CDB) or the pluggable database (PDB) was fun. Other than that though, the instructions provided by the authors were pretty easy to follow.

Design (data modeling, Edition Based Redefinition, VPD), Security (Redaction/Masking, Encryption/Hashing), Coding (Reg Ex, PL/SQL, SQL), Instrumentation, and “Reporting” or turning that raw data into actionable information (Data Mining, Oracle R, Predictive Queries). These topics are covered in detail throughout this book. Everything a developer would need to build an application from scratch.

Probably my favorite part of this endeavor is that I was forced to do more than simply see if it works. Typically when reading a book, or blog entry, I’ll grab the technical solution and move on often skipping the Why, When, and Where. How, to me, is relatively easy. I read AskTom daily for many years, it was my way of taking a break without getting in trouble. At first, it was to see how particular solutions were solved, occasionally using it for my own problems. After a year or two, I wanted to understand the Why of doing it a certain way and would look for those responses where Tom provided insight into his approach.

That’s what I got reviewing this book. I was allowed into their minds, to not only see How they solved technical problems, but Why. This is invaluable for developer’s and DBAs. Most of us can figure out How to solve specific technical issues, but to reach that next level we need to understand the Why, When and Where. This book provides that.

Categories: BI & Warehousing

Journalismus, den die Welt braucht. Teil 3 | Pearls of journalism. Part 3

Dietrich Schroff - Tue, 2016-08-23 14:00
Yippie! I got a new release of IT-BUSINESS:
 And inside there was really nice article:
aha. I did not get this, but there is a magic weapon called chain management. Let's see what Google Translate does with this text:
Channel conflict threatens

The comparison of the "delivery price of Distribution" (blue line) with the average "sales price of Channels" (green line) makes it clear that price reductions on the part of distribution only be partially passed through the channel to the end customer. This focuses thus partially more on profit than on volume growth. A coordinated supply chain management is the solution to avoid such a channel conflict and specifically to develop benefits for participants
I think the english text is much more understandable than the german version...





Networking 102 - part 2

Pat Shuff - Tue, 2016-08-23 11:37
Yesterday we looked at what it takes to start an Apache Web Server on a Linux instance in the Oracle Cloud. We had to create a security rule, security list, and associate it with a running instance as well as configure the firewall on the operating system. We took a castle defense strategy and turned off the firewall on the operating system and are trusting that the external cloud firewall into our server is good enough. Today we are going to drop that assumption and spin up a second server in the same compute zone and configure a secure communication between the two servers. The idea is if we have a database server as a back end to a shopping cart, we want to hide the database from public access. We want to be able to store credit card information, customers addresses and phone numbers and do so securely. We don't want to expose port 1521 to the public internet but only expose it to our Web/Application server and keep it secure in our cloud instance from anyone hacking into it.

To achieve this level of security we will again look at our network diagram and realize that we can communicate on the private network interface rather than the public interface that is facing the public internet. What we want to do is change the network configuration on instance 1 to only listen for traffic from instance 2 and have instance 2 open to the public internet. We will do this with an Apache Web Server because it is easy to configure and test.

Step 1:Go through the configuration steps (all 9 of them) from yesterday and configure one compute instance with an httpd server, ports open, and firewall disabled. We are going to fix the security issues in the upcoming steps and make them only accessible from the second instance that we are about to spin up.

Step 2:Create a second Oracle Linux instance on the same compute cloud. This is done by going into the Create Instance, selecting Oracle Linux 6.6 and accepting the default configurations. A few minutes later we should have a second Linux instance that we can play with. Note that we could have cheated by creating a snapshot of our first instance and spinning up a new instance based on the first instance. This would save us a few steps and configuration options if our installation were more complex. We will save that for another day. Today we will provision an Oracle Linux 6.6 instance with WebServer as the security list which opens up port 80 and 22 for the instance. We accept all of the other defaults.

Step 3:Log into our instance as opc by getting the public ip address from the compute console and using ssh on a Mac or putty on Windows. Once we log in we install w get as a package so that we can read web pages from WebServer1.

Step 4:We can now read the web page from WebServer1 by getting the index.html page from the public ip address as well as the private ip address. We find these ip addresses from the compute console.

Step 5:Now that we can read from the private ip address, we can turn off the public ip address from WebServer1 and communicate on the 10.196 network. This is done by changing the Security List from WebServer back to default for WebServer1. We add the default in the security list and remove the WebServer in the security list.

Step 6:We can test the interface by repeating the read from the http server. We will get a timeout on the public ip address and timeout on the private ip address as well. We will need to create a new security list that allows network communications from the 10.196 network on port 80 to get to the server.

Step 7:We need to define a new Security List that allows port 80 on network 10.196. This is done by going to the Network tab on the compute console and defining a new security list. We will call it privateHttp. Once we have this defined we will allow http on port 80 on the private network but not the public network. We create a security rule for privateWebServer that allows us to go from an instance using port 80 to local instances. Once we have this defined we need to add the privateHttp in the security list for the WebServer1 instance.

Step 7a - add privateHttp to security list

Step 7b - add privateWebServer to security rule

Step 7c - associate new security list with instance

Step 8:Verify that we have connectivity on private network but lack of connectivity on public network

In summary, we created a new compute instance and reconfigured the network for our two compute instances. The goal was to setup our WebServer2 instance so that we could server the public internet with an Apache Web Server. Note that we did not go through these steps because we did this yesterday. We wanted to have WebServer2 talk to WebServer1 but do it on the private network and not have WebServer1 accessible from the public internet. We used an Apache Web Server as the example because it is easy to configure. We could have made this an identity server, a database, a file server, or any service that we want. The key difference would be the port that we create for the communication and security rule/list. Think of running EBusiness Suite or JD Edwards. We really don't want port 1521 of our database exposed to the public internet but we do want the http server exposed. If we run the ERP database on a separate server we need a secure way of communicating with our WebLogic server that is running the ERP logic without exposing drivers license numbers, credit cards, or private information to the public cloud. Hopefully this example allows you to take this concept with web servers and deploy more complex systems into the public cloud securely. It is important to note that we didn't fix the iptables issue and have the firewall turned off for the Linux instance on WebServer1. This is not best practice but we will leave that for another day.

Getting ready your EM12cR5 system with latest Patches for Exadata Management

Arun Bavera - Tue, 2016-08-23 10:00
As of Aug 2016 these are the latest Patches Needed:

For OMS side:
PSU (12.1.0.5.160719)    Note 2158181.1 Patch 23087400 ( latest PSU)
OMS System side Monthly bundle patch – OMS Patch 23741465 ( jul2016)

For Agent side:
Agent Core System Patch: 23639986
Agent DB 12.1.0.8.0 Discovery Patch: 22135601
Agent DB 12.1.0.8.0 Monitoring Patch: 23517257
Agent FMW 12.1.0.8.0 Discovery:  23217959
Agent FMW 12.1.0.8.0 Monitoring: 23741311

EM for Exadata Plug-in  12.1.0.6.160731
Agent Exadata 12.1.0.6.0 Monitoring: 23639890
Agent Exadata 12.1.0.6.0 Discovery:  20844924

Use the EM Patch capability to create a Patch plan and apply these patches (agent side only):



Automating the Agent Side Patching
If you want to automate applying these patches for every new agent and plugin deployment follow this process:
Install the above agent side patches on any one of the agent. Use this as Golden Template and use Clone feature to deploy the further agent. ( Each GoldenTemplate for each platform)
OR
Step 1: Copy the Agent Sytem Patch to: $OMS_HOME/install/oneoffs/<agentversion>/<platform>
For Example:
cd /u01/app/oracle/middleware/oms/install/oneoffs/12.1.0.5.0/Generic
ls -ltr
total 19987
-rw-r--r-- 1 emuser oinstall 20383932 Aug 23 10:36 p23639986_121050_Generic.zipStep2: Create the custom plugin out of the above any one Golden Agent, to bake the patches in the default plugins:
Database Custom Plugin creation:
emcli create_custom_plugin_update -agent_name="mysystem.com:3872" -plugin_id="oracle.sysman.db" -overwrite
FMW Custom Plugin creation:
emcli create_custom_plugin_update -agent_name="mysystem.com:3872" -plugin_id="oracle.sysman.emas" -overwrite
Exadata Custom Plugin creation:
emcli create_custom_plugin_update -agent_name="mysystem.com:3872" -plugin_id="oracle.sysman.xa" -overwrite
Verify the patches:
emcli list_patches_in_custom_plugin_update -plugin="oracle.sysman.db" 
emcli list_patches_in_custom_plugin_update -plugin="oracle.sysman.db" -discovery

emcli list_patches_in_custom_plugin_update -plugin="oracle.sysman.emas" 
emcli list_patches_in_custom_plugin_update -plugin="oracle.sysman.emas" -discovery

emcli list_patches_in_custom_plugin_update -plugin="oracle.sysman.emas" 
emcli list_patches_in_custom_plugin_update -plugin="oracle.sysman.xa" -discovery


Now, any new agent deployed from console or emcli, even though you forget to use clone feature will make sure the latest Agent System patches are picked up from default patch locations and plugins deployed will make sure the patches contains for plugins as they are the default plugins now.

References:
Applying Enterprise Manager Recommended Patches (Doc ID 1664074.1)
Oracle Recommended Patches (PSU) for Enterprise Manager Base Platform (All Releases) (Doc ID 822485.1)
Document 2038446.1 - Enterprise Manager 12.1.0.5.0 (PS4) Master Bundle Patch List
Enterprise Manager Cloud Control 12c Recommended Plug-Ins and Patches for Database as a Service (DBaaS) (Doc ID 1549855.1)         
Enterprise Manager for Exadata 12.1.0.6.0 Bundle Patch Bug List (Doc ID 1929659.1)
Patch Requirements for Setting up Monitoring and Administration for Exadata (Doc ID 1323298.1)
http://oraforms.blogspot.ca/2014/05/oracle-em12c-release-and-patch-schedules.html
https://blogs.oracle.com/oem/entry/simplified_agent_and_plug_in
Categories: Development

Webcast Tomorow! The Road to Cloud: Digital Experience Best Practices

WebCenter Team - Tue, 2016-08-23 08:37
The Road to Cloud: Digital Experience Best Practices Prioritize your customer, partner and employee experiences

Digital Transformation

With the rise of the digital world — web, mobile, social and cloud technologies have changed people’s expectations of how they engage with each other and how work gets done. For most organizations, it’s not a matter of “if” they will migrate to the cloud, it’s “when”.

Join CMSWire with Craig Wentworth, Principal Analyst at MWD Advisors, and David Le Strat, Senior Director of Product Management at Oracle, for a one-hour webinar on how you can leverage your current IT investments as you modernize your applications infrastructure to embrace new digital imperatives to meet customer, partner and employee experiences.

AUG
24

Wed, Aug 24 at 10am PT/ 1pm ET/ 7pm CET

This webinar will cover:

  • How to overcome common challenges and hurdles of cloud adoption
  • Key trends in embracing cloud, content and experience management solutions
  • How to leverage your existing investments while still reaping the benefits of the cloud

Register Today!

Bonus: Webinar attendees have a chance to win a free pass to CMSWire'sDX Summit 2016, November 14 - 16, in Chicago (a value of $1295). The winner will be announced at the end of the live Q&A.

How To Poke Around OBIEE on Linux with strace (Working with Unsupported ODBC Sources in OBIEE 12c)

Rittman Mead Consulting - Tue, 2016-08-23 08:30

OBIEE 12c (and 11g and 10g before it) supports three primary ways of connecting to data sources:

  1. Native Gateway, such as OCI for Oracle. This is always the preferred option as it gives the greatest support and performance.
  2. Data Direct ODBC Drivers, a set of which are bundled with OBIEE for enabling connectivity to sources such as SQL Server, MySQL, Hive, and Impala. The configuration of these is documented in the OBIEE manuals and is generally a supported configuration.
  3. Native ODBC Drivers.

There's also kind of a fourth option, which is JDBC, as explained by Fiston in this excellent post. It's OBIEE 12c only and not fully documented/supported.

In this article we're going to dig into the third option (native ODBC) and look at how it can be used, and also how to troubleshoot it (and the OBIEE stack in general) on Linux.

ODBC (Open Database Connectivity) is a documented API designed to enable applications to work with databases, without one explicitly supporting the other. A comparable protocol is JDBC, which is also widely used (but as yet not fully supported/documented within OBIEE). To use native ODBC drivers with OBIEE on *nix, you install the driver on your OBIEE server and then configure OBIEE to use it. Mark Rittman wrote an example of how to do this with the original Hive ODBC drivers here (before they were formally bundled with OBIEE), and the manual shows how to use it with a native driver for Teradata.

My interest in this is the Apache Drill tool, which enables querying with SQL against a multitude of datasources, including things like JSON files, Hive tables, RDBMS, and more. MapR have released an ODBC driver for it, and I thought it'd be neat to get Apache Drill to work with OBIEE. It evidently does work for OBIEE running on Windows, but I wanted to be able to use it on my standard environment, Linux. This blog post is a warts-and-all exploration of the process I went through to get it to work, since I thought it might be of interest to see some of the forensic methods available when trying to get things to work. For just the headlines, see Using Apache Drill with OBIEE 12c.

First Things First - Setting Up Apache Drill

Drill can be deployed in distributed configuration (with all the parallel processing goodness which that brings), but also run as a single instance locally. For the sake of simplicity that's what I'm going to do here. It's rather easy to do:

# Download Apache Drill
wget http://www.apache.org/dyn/closer.cgi/drill/drill-1.7.0/apache-drill-1.7.0.tar.gz
# Unpack
tar -xvf apache-drill-1.7.0.tar.gz
# Run
cd /opt/apache-drill-1.7.0/ && bin/sqlline -u jdbc:drill:zk=local

You need to make sure you've got a recent JDK available, and if you're running it on SampleApp, watch out for this odd problem that I had which was related to classpaths and manifested itself with the error java.lang.NoSuchMethodError: com.fasterxml.jackson.databind.JavaType.isReferenceType()Z.

All being well, you'll now have a Drill prompt:

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=512M; support was removed in 8.0  
Aug 09, 2016 5:51:43 AM org.glassfish.jersey.server.ApplicationHandler initialize  
INFO: Initiating Jersey application, version Jersey: 2.8 2014-04-29 01:25:26...  
apache drill 1.7.0  
"say hello to my little drill"
0: jdbc:drill:zk=local>  

From here you can run a simple query to check the version:

0: jdbc:drill:zk=local> SELECT version FROM sys.version;  
+----------+
| version  |
+----------+
| 1.7.0    |
+----------+
1 row selected (0.392 seconds)  

or query one of the built-in sample data sets:

0: jdbc:drill:zk=local> select count(*) from cp.`employee.json`;  
+---------+
| EXPR$0  |
+---------+
| 1155    |
+---------+
1 row selected (0.977 seconds)  

For more examples of Drill, see the tutorials.

Setting up Drill ODBC on Linux

With Drill setup and running locally, let's now install the ODBC driver. This is all on SampleApp v511 / Oracle Linux 6.7.

sudo rpm -i http://package.mapr.com/tools/MapR-ODBC/MapR_Drill/MapRDrill_odbc_v1.2.1.1000/MapRDrillODBC-1.2.1.x86_64.rpm

Per the system requirements, we need to make sure that we're using one of the supported ODBC Driver Managers, so we'll install iODBC to start with (the other option being unixODBC):

sudo yum install -y unixodbc

Now follow the configuration instructions. To start with we'll do this in isolation of OBIEE to check that it works, and then bring it into OBIEE's world (for example, odbc.ini already exists in OBIEE).

  1. Set environment variables

    export ODBCINI=~/.odbc.ini
    export MAPRDRILLINI=~/.mapr.drillodbc.ini
    export LD_LIBRARY_PATH=/opt/mapr/drillodbc/lib/64
    
  2. Set up ODBC DSN in ~/.odbc.ini

    [ODBC Data Sources]
    DrillDSN=MapR Drill ODBC Driver 64-bit
    
    
    [DrillDSN]
    Driver=/opt/mapr/drillodbc/lib/64/libmaprdrillodbc64.so
    Description=Drill ODBC Driver
    ConnectionType=Direct
    HOST=localhost
    PORT=31010
    AuthenticationType=No Authentication
    
  3. Copy the default ODBC driver manager config

    cp /opt/mapr/drillodbc/Setup/odbcinst.ini ~/.odbcinst.ini
    
  4. Configure the Drill ODBC driver in ~/.mapr.drillodbc.ini

    Here I've set the log level to Trace, so that we can see what's going on in depth—in practice this would generate huge amounts of unnecessary log data so set it to a lower value (e.g. 0) for actual use.

    [Driver]
    DisableAsync=0
    DriverManagerEncoding=UTF-32
    ErrorMessagesPath=/opt/mapr/drillodbc/ErrorMessages
    LogLevel=6
    LogPath=/tmp/odbc.log
    SwapFilePath=/tmp
    
    
    ODBCInstLib=libiodbcinst.so.2
    # This is the ODBC Driver Manager library
    # Note the documentation - the DriverManagerEncoding (above) will vary depending
    # on the driver manager in use.
    # See https://drill.apache.org/docs/configuring-odbc-on-linux/#configuring-.mapr.drillodbc.ini
    

Having set this up, we'll now test it:

[oracle@demo ~]$ iodbctest "DSN=DrillDSN"

You should see:

iODBC Demonstration program  
This program shows an interactive SQL processor  
Driver Manager: 03.52.0709.0909  
Driver: 1.2.1.1001 (MapR Drill ODBC Driver)

SQL>  

From where you can enter a command (don't include the ; suffix as this is added automatically)

SQL> SELECT version FROM sys.version

version  
--------
1.7.0

result set 1 returned 1 rows.  
  • If you get Unable to locate SQLGetPrivateProfileString function then check that your LD_LIBRARY_PATH includes the location of the Driver Manager (libiodbc.so.2), and that the exact library specified by ODBCInstLib exists—in my installation it was called libiodbcinst.so.2 rather than libiodbc.so as shown in the docs. Also check that you've set MAPRDRILLINI environment variable.
    • libiodbc installs into /usr/lib64 which is one of the default paths checked for library files, hence not including it explicitly in the LD_LIBRARY_PATH environment variable.
  • If you just get Have a nice day. with no error but no SQL> prompt, check your ODBC DSN configuration. I hit this issue when inadvertently omitting the AuthenticationType parameter.

If you head over to /tmp/odbc.log/ you should see a file called driver.log with a bunch of trace data in it. Here's the data from the above session, excluding TRACE logs:

Aug 09 06:23:35.701 INFO  1148090112 Driver::LogVersions: SDK Version: 09.05.07.1008  
Aug 09 06:23:35.701 INFO  1148090112 Driver::LogVersions: DSII Version: 1.2.1.1001  
Aug 09 06:23:35.701 INFO  1148090112 Driver::Initialize: Database CHAR Encoding: UTF-8  
Aug 09 06:23:35.701 INFO  1148090112 Driver::Initialize: Database WCHAR Encoding: UTF-8  
Aug 09 06:23:35.701 INFO  1148090112 Driver::Initialize: ANSI CHAR Encoding: UTF-8  
Aug 09 06:23:35.701 INFO  1148090112 Driver::Initialize: Driver Manager WCHAR Encoding: UTF-32LE  
Aug 09 06:23:35.702 INFO  1148090112 Driver::Initialize: Detected Driver Manager: iODBC, 3.52.7  
Aug 09 06:23:35.702 INFO  1148090112 Driver::Initialize: Locale name: en_GB  
Aug 09 06:23:35.702 INFO  1148090112 Driver::Initialize: Bitness: 64-bit  
Aug 09 06:23:35.702 INFO  1148090112 CInterface::SQLAllocHandle: Allocating environment handle.  
Aug 09 06:23:35.702 INFO  1148090112 Environment::SQLSetEnvAttr: Attribute: SQL_ATTR_ODBC_VERSION (200)  
Aug 09 06:23:35.702 INFO  1148090112 EnvironmentAttributes::SetAttribute: Setting ODBC version to: 3  
Aug 09 06:23:35.702 INFO  1148090112 CInterface::SQLAllocHandle: Allocating connection handle.  
Aug 09 06:23:35.702 INFO  1148090112 Connection::SQLSetConnectAttr: Attribute: Unknown Attribute (1051)  
Aug 09 06:23:35.702 INFO  1148090112 ConnectionAttributes::SetAttribute: Invalid attribute: 1051  
Aug 09 06:23:35.704 ERROR 1148090112 Connection::SQLSetConnectAttr: [MapR][ODBC] (10210) Attribute identifier invalid or not supported: 1051  
Aug 09 06:23:35.708 INFO  1148090112 DiracClient::DiracClient: Create a new Dirac Client [194bd90] (handshakeTimeout = 5, queryTimeout = 180)  
Aug 09 06:23:35.708 INFO  1148090112 DiracClient::connect: Connection String 'local=localhost:31010' & Default Schema ''  
Aug 09 06:23:35.712 DEBUG 1148090112 DiracClient::connect: Connection successfully.  
Aug 09 06:23:35.713 INFO  1148090112 Connection::SQLGetInfoW: InfoType: SQL_CURSOR_COMMIT_BEHAVIOR (23)  
Aug 09 06:23:35.713 INFO  1148090112 Connection::SQLGetInfoW: InfoType: SQL_CURSOR_ROLLBACK_BEHAVIOR (24)  
Aug 09 06:23:35.713 INFO  1148090112 Connection::SQLGetInfoW: InfoType: SQL_DRIVER_VER (7)  
Aug 09 06:23:35.713 INFO  1148090112 Connection::SQLGetInfoW: InfoType: SQL_DRIVER_NAME (6)  
Aug 09 06:23:35.713 INFO  1148090112 CInterface::SQLAllocHandle: Allocating statement handle.  
Aug 09 06:23:35.714 INFO  1148090112 Statement::SQLGetStmtAttrW: Attribute: SQL_ATTR_APP_ROW_DESC (10010)  
Aug 09 06:23:35.714 INFO  1148090112 Statement::SQLGetStmtAttrW: Attribute: SQL_ATTR_APP_PARAM_DESC (10011)  
Aug 09 06:23:35.714 INFO  1148090112 Statement::SQLGetStmtAttrW: Attribute: SQL_ATTR_IMP_ROW_DESC (10012)  
Aug 09 06:23:35.714 INFO  1148090112 Statement::SQLGetStmtAttrW: Attribute: SQL_ATTR_IMP_PARAM_DESC (10013)  
Aug 09 06:25:39.409 INFO  1148090112 StatementState::InternalPrepare: Preparing query: SELECT version FROM sys.version  
Aug 09 06:25:39.412 INFO  1148090112 DiracClient::ExecuteStatementDirect: DRResultSet [19494c0] executes query 'SELECT * FROM (SELECT version FROM sys.version) T LIMIT 0'  
Aug 09 06:25:39.412 DEBUG 1148090112 DRResultSet::GetNextRecordBatch: START DEQUEUE. Current ResultQueue Size = 0  
Aug 09 06:25:40.219 DEBUG 979547904 DiracClient::QueryResultsListener: DRResultSet [19494c0]: Handle RecordBatch [34001c40], DrillClientError [0]'  
Aug 09 06:25:40.219 DEBUG 1148090112 DRResultSet::GetNextRecordBatch: END DEQUEUE. Get RecordBatch 34001c40 [m_recordCount = 0 ]. Now ResultQueue Size = 0  
Aug 09 06:25:40.219 DEBUG 1148090112 DRResultSet::InitializeColumns: Column 1 version: {DataMode: OPTIONAL, MinorType: VARCHAR, Precision = 1, Scale = 0}  
Aug 09 06:25:40.219 DEBUG 1148090112 DRResultSet::GetNextRecordBatch: START DEQUEUE. Current ResultQueue Size = 0  
Aug 09 06:25:40.276 DEBUG 979547904 DiracClient::QueryResultsListener: DRResultSet [19494c0]: Handle RecordBatch [0], DrillClientError [0]'  
Aug 09 06:25:40.276 DEBUG 1148090112 DRResultSet::GetNextRecordBatch: status = QRY_COMPLETED.  
Aug 09 06:25:40.276 INFO  1148090112 DiracClient::CloseStatement: Close statement and free query resources  
Aug 09 06:25:40.276 INFO  1148090112 DiracClient::ExecuteStatementDirect: DRResultSet [19494c0] executes query 'SELECT version FROM sys.version'  
Aug 09 06:25:40.277 DEBUG 1148090112 DRResultSet::GetNextRecordBatch: START DEQUEUE. Current ResultQueue Size = 0  
Aug 09 06:25:40.748 DEBUG 979547904 DiracClient::QueryResultsListener: DRResultSet [19494c0]: Handle RecordBatch [3400cb60], DrillClientError [0]'  
Aug 09 06:25:40.750 DEBUG 1148090112 DRResultSet::GetNextRecordBatch: END DEQUEUE. Get RecordBatch 3400cb60 [m_recordCount = 1 ]. Now ResultQueue Size = 0  
Aug 09 06:25:40.750 DEBUG 1148090112 DRResultSet::InitializeColumns: Column 1 version: {DataMode: OPTIONAL, MinorType: VARCHAR, Precision = 1, Scale = 0}  
Aug 09 06:25:40.751 DEBUG 1148090112 DRResultSet::GetNextRecordBatch: START DEQUEUE. Current ResultQueue Size = 0  
Aug 09 06:25:40.985 DEBUG 979547904 DiracClient::QueryResultsListener: DRResultSet [19494c0]: Handle RecordBatch [0], DrillClientError [0]'  
Aug 09 06:25:40.985 DEBUG 1148090112 DRResultSet::GetNextRecordBatch: status = QRY_COMPLETED.  
Aug 09 06:25:40.986 INFO  1148090112 DiracClient::CloseStatement: Close statement and free query resources  
Aug 09 06:25:40.991 ERROR 1148090112 Statement::SQLCloseCursor: [MapR][ODBC] (10510) Invalid cursor state.  
Aug 09 06:27:19.748 ERROR 1148090112 Statement::SQLCloseCursor: [MapR][ODBC] (10510) Invalid cursor state.  
Aug 09 06:27:19.748 INFO  1148090112 CInterface::SQLFreeHandle: Freeing statement handle.  
Aug 09 06:27:19.748 INFO  1148090112 DiracClient::~DiracClient: Close the Dirac Client [194bd90]  
Aug 09 06:27:19.748 INFO  1148090112 CInterface::SQLFreeHandle: Freeing connection handle.  
Aug 09 06:27:19.749 INFO  1148090112 CInterface::SQLFreeHandle: Freeing environment handle.  
Hooking it up to OBIEE

We've shown that we can connect to Apache Drill using ODBC and query it. Let's see if we get it to work for OBIEE. Our starting point is the 12c docs, Configuring Database Connections Using Native ODBC Drivers.

  1. Environment variables are defined per-component in a .properties file, which for the BI Server (OBIS / nqsserver) is BI_DOMAIN/config/fmwconfig/bienv/obis/obis.properties, so on SampleApp /app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/OBIS/obis.properties. To this file (which in 12.2.1 is empty by default) we add:

    MAPRDRILLINI=/home/oracle/.mapr.drillodbc.ini
    LD_LIBRARY_PATH=/opt/mapr/drillodbc/lib/64
    
  2. Add the Drill DSN to odbc.ini which for OBIEE already exists and is populated with other ODBC configurations. You'll find the file in BI_DOMAIN/config/fmwconfig/bienv/core, which on SampleApp is /app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/odbc.ini.

    1. Add to the [ODBC Data Sources] section

      DrillDSN=MapR Drill ODBC Driver 64-bit
      
    2. Add a section to the bottom of the file:

      [DrillDSN]
      Driver=/opt/mapr/drillodbc/lib/64/libmaprdrillodbc64.so
      AuthenticationType=No Authentication
      Description=Drill ODBC Driver
      ConnectionType=Direct
      HOST=localhost
      PORT=31010
      

Now restart the BI Server:

/app/oracle/biee/user_projects/domains/bi/bitools/bin/stop.sh -i obis1 && /app/oracle/biee/user_projects/domains/bi/bitools/bin/start.sh -i obis1

We can check that the BI Server has picked up our new environment variables by using the /proc pseudo file-system (you can also see an environment variable dump as part of the obis1.out logfile during startup):

[oracle@demo ~]$ strings /proc/$(pgrep nqsserver)/environ|grep mapr
LD_LIBRARY_PATH=/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib:/app/oracle/biee/bi/bifoundation/server/bin:/app/oracle/biee/bi/bifoundation/web/bin:/app/oracle/biee/bi/clients/Essbase/EssbaseRTC/bin:/app/oracle/biee/bi/lib:/app/oracle/biee/lib:/app/oracle/biee/oracle_common/adr:/app/oracle/biee/oracle_common/lib:/usr/lib:/lib:/opt/mapr/drillodbc/lib/64:::/app/oracle/app/oracle/product/12.1.0/dbhome_1/lib:/app/oracle/endeca/olt/bin:/app/oracle/biee/wlserver/server/native/linux/x86_64:/app/oracle/biee/wlserver/server/native/linux/x86_64/oci920_8:/app/oracle/biee/wlserver/server/native/linux/x86_64:/app/oracle/biee/wlserver/server/native/linux/x86_64/oci920_8
MAPRDRILLINI=/home/oracle/.mapr.drillodbc.ini

Over in the Administration Tool I set up a new Database (type: ODBC Basic) and associated connection pool (ODBC 2.0) pointing to DrillDSN.

Now to try it out! In Answers I build a Direct Database Request:

But...oh no!

Odbc driver returned an error (SQLExecDirectW).
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. (HY000)
State: HY000. Code: 12010. [nQSError: 12010] Communication error connecting to remote end point: address = demo.us.oracle.com; port = 7792. (HY000)
SQL Issued: {call NQSGetQueryColumnInfo('EXECUTE PHYSICAL CONNECTION POOL "Apache Drill"."Apache Drill" SELECT version FROM sys.version;')}

Let's pick through this, because it's a common error and easily misinterpreted.

  1. Odbc driver returned an error (SQLExecDirectW).

    • When you run an analysis/dashboard, Presentation Services (OBIPS/sawserver) connects to the BI Server (OBIS/nqsserver) to send the request as Logical SQL, and it connects to the BI Server using ODBC. Therefore any kind of issue running the request will always show as an "ODBC error".

    • Learning: nothing, other than that Presentation Services hit an error.

  2. State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. (HY000)

    • Learning: nothing. Something went wrong, somewhere, and OBIEE was involved (nQSError).
  3. State: HY000. Code: 12010. [nQSError: 12010] Communication error connecting to remote end point: address = demo.us.oracle.com; port = 7792. (HY000)

    • Now we're getting somewhere. Port 7792 is, on this server, the BI Server (OBIS / nqsserver). And, there was an error connecting to it.
    • Learning: We failed to successfully connect to the BI Server. Is it running? Was it running but crashed? Is there a network problem? Lots to investigate.
  4. SQL Issued: {call NQSGetQueryColumnInfo('EXECUTE PHYSICAL CONNECTION POOL "Apache Drill"."Apache Drill" SELECT version FROM sys.version;')}

    • Learning: This is the logical SQL that Presentation Services was trying to run. Useful to know.

Let's go and have a look at the BI Server log, because something's evidently not right. We know that it was running, because otherwise we'd not have been able to login to OBIEE in the first place.

In /app/oracle/biee/user_projects/domains/bi/servers/obis1/logs/obis1.out there's some bad news:

<NodeManager ComponentManager> <The server 'obis1' with process id 7059 is no longer alive; waiting for the process to die.>
<NodeManager ComponentManager> <Process died.>
<NodeManager ComponentManager> <get latest startup configuration before deciding/trying to restart the server>
<NodeManager ComponentManager> <Server failed so attempting to restart (restart count = 1)>

So it looks like the BI Server crashed. In the folder above where obis1.out is kept, there's a corresponding crash report (note that the process ID matches the log message above), nqsserver_7059_crashreport.txt. Some bits of interest from it:

[...]
Beginning of crash dump...  
Signal: 11  
================================================================
[...]
Activity type: ExecutePhysical GatewayDbGateway Prepare  
DSN:Apache Drill  
User Name:weblogic  
SQL:SELECT version FROM sys.version;  
================================================================
Activity #2 ECID: 005EPt5qYm2Fw000jzwkno0001iJ0001KT,0  
================================================================
Activity type: Producer Executing Query  
Repository Name:ssi;Subject Area Name:;User Name:weblogic  
Logical Hash of SQL: 0x3d5c4ef2SQL:{call NQSGetQueryColumnInfo('EXECUTE PHYSICAL  CONNECTION POOL "Apache Drill"."Apache Drill" SELECT version FROM sys.version;')}  
[...]

BACKTRACE:  
/app/oracle/biee/bi/bifoundation/server/bin/libnqutilityserver64.so(+0x12a829)[0x7f554995b829]
/lib64/libpthread.so.0(+0xf790)[0x7f5547cde790]
/lib64/libc.so.6(cfree+0x1c)[0x7f554721693c]
/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libodbc.so(+0xa5c55)[0x7f550f2efc55]
/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libodbc.so(+0xa4fc0)[0x7f550f2eefc0]
/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libodbc.so(+0xa53f0)[0x7f550f2ef3f0]
/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libodbc.so(SQLDriverConnect+0x149)[0x7f550f2d8337]
/app/oracle/biee/bi/bifoundation/server/bin/libnqsdbgatewayodbc64.so(_ZN8NQSQLAPI18NQSQLDriverConnectEPvS0_RKN3sup6StringIwN7_SASSTL9allocatorIwEEEES8_S8_tbS8_+0x1c8)[0x7f54abfb5078]
/app/oracle/biee/bi/bifoundation/server/bin/libnqsdbgatewayodbc64.so(_ZN24OdbcDataSourceConnection7ConnectERK6SignonbjN10ServerInfo17TxnIsolationLevelEi+0x275)[0x7f54abfcbb45]
/app/oracle/biee/bi/bifoundation/server/bin/libnqutilityserver64.so(_ZN20DataSourceConnection7ConnectERK6SignonbRK14GatewayOptions+0x79)[0x7f55498d6819]
/app/oracle/biee/bi/bifoundation/server/bin/libnqsdbconnection64.so(_ZN12DbConnection9FixDamageERK14GatewayOptions+0x7c)[0x7f55524e12cc]
/app/oracle/biee/bi/bifoundation/server/bin/libnqsdbconnection64.so(_ZN20SingleThreadedDbPool22GetAvailableConnectionERK6SignonR17DbConnectionGuardRbRK14GatewayOptions+0x45e)[0x7f555250513e]
/app/oracle/biee/bi/bifoundation/server/bin/libnqsdbgateway64.so(_ZN11NQDbGateway7PrepareEv+0xb14)[0x7f5552294fa4]
/app/oracle/biee/bi/bifoundation/server/bin/libnqsexecutionlist64.so(_ZN8Producer11ExecuteOnceEv+0xb4c)[0x7f555146192c]
/app/oracle/biee/bi/bifoundation/server/bin/libnqutilitygeneric64.so(_ZN16NQExecutionState17ExecuteSystemMainEv+0x82)[0x7f5549c92032]
/app/oracle/biee/bi/bifoundation/server/bin/libnqutilitygeneric64.so(_ZN15NQThreadJobBase17ExecuteSystemMainEv+0x51)[0x7f5549cd9dd1]
/app/oracle/biee/bi/bifoundation/server/bin/libnqsdbconnection64.so(_ZN18NQThreadServerBaseI17ManagedJobFunctorE11ScheduleJobEv+0x40)[0x7f5552509650]
/app/oracle/biee/bi/bifoundation/server/bin/libnqutilitygeneric64.so(_ZN19NQThreadServerNoJob15ExecuteUserMainEv+0x16)[0x7f5549cda256]
/app/oracle/biee/bi/bifoundation/server/bin/libnqutilitygeneric64.so(_ZN16NQExecutionState17ExecuteSystemMainEv+0x82)[0x7f5549c92032]
/app/oracle/biee/bi/bifoundation/server/bin/libnqutilitygeneric64.so(_ZN8NQThread17ExecuteSystemMainEv+0x5b)[0x7f5549cd897b]
/app/oracle/biee/bi/bifoundation/server/bin/libnqutilitygeneric64.so(_ZN8NQThread15ThreadMainEntryEPv+0x2e)[0x7f5549cd8c9e]
/lib64/libpthread.so.0(+0x7a51)[0x7f5547cd6a51]
/lib64/libc.so.6(clone+0x6d)[0x7f554728393d]

Signal 11 is "SIGSEGV", or segmentation fault, which is bad, m'kay?

Tracing OBIEE's ODBC Connectivity with strace

Looking in at the ODBC driver.log we can see that something happened, but no error logged. Here's everything, minus TRACE logs:

Aug 09 07:13:43.283 INFO  2896611072 Driver::LogVersions: SDK Version: 09.05.07.1008  
Aug 09 07:13:43.288 INFO  2896611072 Driver::LogVersions: DSII Version: 1.2.1.1001  
Aug 09 07:13:43.288 INFO  2896611072 Driver::Initialize: Database CHAR Encoding: UTF-8  
Aug 09 07:13:43.288 INFO  2896611072 Driver::Initialize: Database WCHAR Encoding: UTF-8  
Aug 09 07:13:43.288 INFO  2896611072 Driver::Initialize: ANSI CHAR Encoding: UTF-8  
Aug 09 07:13:43.288 INFO  2896611072 Driver::Initialize: Driver Manager WCHAR Encoding: UTF-32LE  
Aug 09 07:13:43.289 INFO  2896611072 Driver::Initialize: Detected Driver Manager: DataDirect Driver Manager, 07.14.0119 (U0115)  
Aug 09 07:13:43.289 INFO  2896611072 Driver::Initialize: Locale name: en_US  
Aug 09 07:13:43.289 INFO  2896611072 Driver::Initialize: Bitness: 64-bit  
Aug 09 07:13:43.290 INFO  2896611072 CInterface::SQLAllocHandle: Allocating environment handle.  
Aug 09 07:13:43.293 INFO  2896611072 CInterface::SQLAllocHandle: Allocating connection handle.  
Aug 09 07:13:43.298 ERROR 2896611072 CInterface::SQLGetConnectAttr: [MapR][ODBC] (10210) Attribute identifier invalid or not supported: 1063  
Aug 09 07:13:43.300 INFO  2896611072 CInterface::SQLFreeHandle: Freeing connection handle.  
Aug 09 07:13:43.301 INFO  2896611072 CInterface::SQLFreeHandle: Freeing environment handle.  
Aug 09 07:13:43.312 INFO  2896611072 CInterface::SQLAllocHandle: Allocating environment handle.  
Aug 09 07:13:43.315 INFO  2896611072 Environment::SQLSetEnvAttr: Attribute: SQL_ATTR_ODBC_VERSION (200)  
Aug 09 07:13:43.315 INFO  2896611072 EnvironmentAttributes::SetAttribute: Setting ODBC version to: 2  
Aug 09 07:13:43.315 INFO  2896611072 CInterface::SQLAllocHandle: Allocating connection handle.  
Aug 09 07:13:43.317 INFO  2896611072 Environment::SQLGetEnvAttr: Attribute: Unknown Attribute (1065)  
Aug 09 07:13:43.317 INFO  2896611072 Connection::SQLGetInfoW: InfoType: SQL_DRIVER_ODBC_VER (77)  

One thing that stands out (with the benefit of hindsight because I've been hacking away at this for a while) is

Driver::Initialize: Detected Driver Manager: DataDirect Driver Manager, 07.14.0119 (U0115)

Whereas in my successful standalone test above it was

Driver::Initialize: Detected Driver Manager: iODBC, 3.52.7

So now let's do some digging. Using strace (which I've written about previously) we can see every system call that OBIEE makes, letting us audit the files that it reads and libraries that it loads. You can invoke strace at process startup or, easier, attach it to a running one. Since the BI Server also creates child processes, and also may crash (as here), we'll use a loop to make sure we've always got a strace running against it until we opt to cancel it:

while [ 1 -eq 1 ]; do strace -f -p $(pgrep nqsserver) -tt -y -s 4096 -o ~/nqs_trace_$(date +%Y%m%dT%H%M%S%N).out;done

If the BI Server isn't running, you'll just see

strace: Invalid process id: '-tt'

But once it starts, you'll get

Process 8457 attached

The output is written to the home folder, in files named nqs_trace_ followed by the timestamp at which the trace started. To cancel it, hit Ctrl-C several times to break out of strace and the while loop. If you leave this running for a long period of time you'll likely fill the filesystem and possibly make the server unusable…

Using your text editor of choice, you can search through the strace output to try and pick apart what's happening. Even if you don't find the cause of the error, you can at least rule other causes out this way. For example, whether a configuration file that you think is being used actually is, or where a library is actually being read from.

First up in searching the trace for odbc is the BI Server's own ODBC gateway library being opened and read:

7222  07:13:43.080212 open("/app/oracle/biee/bi/bifoundation/server/bin/libnqsdbgatewayodbc64.so", O_RDONLY) = 31

Next it checks for the odbc.ini configuration file and gets a success return code (0), but at this point it doesn't read it

8382  07:13:43.097901 stat("/app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/odbc.ini", {st_mode=S_IFREG|0640, st_size=2613, ...}) = 0

and then looks for the ODBC trace library, and this is interesting because it can't find it. One of the very useful things with strace is to be able to see all the paths that a program tries to read for a given file. Here you see a selection of the paths it's trying, and the failure (-1 ENOENT (No such file or directory)) each time:

8382  07:13:43.098135 stat("/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/odbctrac.so", 0x7f54aca68b90) = -1 ENOENT (No such file or directory)
8382  07:13:43.098190 stat("/usr/local/lib//app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/odbctrac.so", 0x7f54aca68b90) = -1 ENOENT (No such file or directory)
8382  07:13:43.098230 stat("/usr/local/lib/..//app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/odbctrac.so", 0x7f54aca68b90) = -1 ENOENT (No such file or directory)
8382  07:13:43.098274 stat("/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib//app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/odbctrac.so", 0x7f54aca68b90) = -1 ENOENT (No such file or directory)
8382  07:13:43.098312 stat("/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/..//app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/odbctrac.so", 0x7f54aca68b90) = -1 ENOENT (No such file or directory)

We can use one of my favourite linux utilities, locate, to find where this file actually is:

[oracle@demo ~]$ locate odbctrac.so
/app/oracle/biee/bi/bifoundation/odbc/lib/odbctrac.so
/app/oracle/biee/bi/common/ODBC/Merant/5.3/lib/odbctrac.so

You can install this on your system with sudo yum install -y mlocate, and if you've recently changed files (e.g. installed a new package) refresh the database with sudo updatedb before running locate.

This is one interesting point of note here, then, that the ODBC trace library isn't loading properly. Let's note this for now, and carry on through the trace file. Next up it opens and reads the odbc.ini file:

8382  07:13:43.102664 open("/app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/odbc.ini", O_RDONLY) = 31
8382  07:13:43.102786 read(31</app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/odbc.ini>, "[ODBC]\nTrace=1\nTraceFile=/app/oracle/biee/user_projects/domains/bi/odbctrace.out\nTraceDll=/app/oracle/biee/bi/common/ODBC/M [...]

Now we get into the meat of it. The Apache Drill ODBC driver gets checked that it exists:

8382  07:13:43.109475 stat("/opt/mapr/drillodbc/lib/64/libmaprdrillodbc64.so", {st_mode=S_IFREG|0645, st_size=38794216, ...}) = 0

and then opened and read. Next OBIEE tries to read the libdrillClient.so library, starting here:

8382  07:13:43.113071 open("/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)

Note that this fails (-1 ENOENT), and it works it's way through other paths until it succeeds:

8382  07:13:43.113071 open("/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113189 open("/app/oracle/biee/bi/bifoundation/server/bin/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113238 open("/app/oracle/biee/bi/bifoundation/web/bin/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113274 open("/app/oracle/biee/bi/clients/Essbase/EssbaseRTC/bin/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113309 open("/app/oracle/biee/bi/lib/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113341 open("/app/oracle/biee/lib/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113374 open("/app/oracle/biee/oracle_common/adr/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113408 open("/app/oracle/biee/oracle_common/lib/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113440 open("/usr/lib/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113484 open("/lib/libdrillClient.so", O_RDONLY) = -1 ENOENT (No such file or directory)
8382  07:13:43.113517 open("/opt/mapr/drillodbc/lib/64/libdrillClient.so", O_RDONLY) = 31

Where do these paths come from? LD_LIBRARY_PATH! And we can confirm that by comparing the above sequence of folders with the value of LD_LIBRARY_PATH that we saw above, split out onto lines here with a bit of sed magic:

[oracle@demo ~]$  strings /proc/$(pgrep nqsserver)/environ|grep LD_LIBRARY_PATH|sed 's/:/\n/g'|sed 's/=/\n/g'
LD_LIBRARY_PATH
/app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib
/app/oracle/biee/bi/bifoundation/server/bin
/app/oracle/biee/bi/bifoundation/web/bin
/app/oracle/biee/bi/clients/Essbase/EssbaseRTC/bin
/app/oracle/biee/bi/lib
/app/oracle/biee/lib
/app/oracle/biee/oracle_common/adr
/app/oracle/biee/oracle_common/lib
/usr/lib
/lib
/opt/mapr/drillodbc/lib/64

So...we've read the odbc.ini config file, loaded the Apache Drill ODBC driver (libmaprdrillodbc64.so) and associated library (libdrillClient.so). Now a further library is opened and read:

8382  07:13:43.271710 open("/opt/mapr/drillodbc/lib/64/SimbaDrillODBC.did", O_RDONLY) = 31

and then the Apache Drill ODBC driver configuration file that we created earlier (and referenced in the MAPRDRILLINI environment variable) is opened and read:

8382  07:13:43.281356 open("/home/oracle/.mapr.drillodbc.ini", O_RDONLY) = 31

Because we've enabled logging in the driver configuration, what happens next in the strace is that log file being created and written to:

8382  07:13:43.283527 mkdir("/tmp/odbc.log/", 0755) = -1 EEXIST (File exists)
8382  07:13:43.283834 open("/tmp/odbc.log/driver.log", O_WRONLY|O_CREAT|O_APPEND, 0666) = 31
8382  07:13:43.284037 fstat(31</tmp/odbc.log/driver.log>, {st_mode=S_IFREG|0640, st_size=174018, ...}) = 0
8382  07:13:43.284220 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f54ad460000
8382  07:13:43.284338 fstat(31</tmp/odbc.log/driver.log>, {st_mode=S_IFREG|0640, st_size=174018, ...}) = 0
8382  07:13:43.284389 lseek(31</tmp/odbc.log/driver.log>, 174018, SEEK_SET) = 174018
8382  07:13:43.284438 write(31</tmp/odbc.log/driver.log>, "Aug 09 07:13:43.283 INFO  2896611072 Driver::LogVersions: SDK Version: 09.05.07.1008\n", 85) = 85
[...]

After a bunch of trace logging is written, the ODBC messages translation file is read:

8382  07:13:43.290888 read(34</opt/mapr/drillodbc/ErrorMessages/en-US/ODBCMessages.xml>, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<!DOCTYPE Messages [\n    <!ELEMENT Messages (Package*)>\n\n    <!ELEMENT Package (Error*)>\n    <!ATTLI

The next file read is odbc.ini again

8382  07:13:43.304659 read(35</app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/odbc.ini>, "", 4096) = 0

followed by odbc.ini in the default /etc/ path (which exists but is zero bytes):

8382  07:13:43.306727 open("/etc/odbc.ini", O_RDONLY) = 35

The odbcinst.ini file is then read, from /etc/odbcinst.ini (which is created by unixODBC on installation, and has entries for non-existant mysql/postgresql drivers):

8382  07:13:43.307417 read(35</etc/odbcinst.ini>, "# Example driver definitions\n\n# Driver from the postgresql-odbc package\n# Setup from the unixODBC package\n[PostgreSQL]\nDescription\t= ODBC for PostgreSQL\nDriver\t\t= /usr/lib/psqlod

and then the version for Drill:

8382  07:13:43.308040 read(35</home/oracle/.odbcinst.ini>, "[ODBC Drivers]\nMapR Drill ODBC Driver 64-bit=Installed\n\n[MapR Drill ODBC Driver 64-bit]\nDescription=MapR Drill ODBC Driver(64-bit)\nDriver=/opt/mapr/drillodbc/lib/64/libmaprd

Back to the odbc.ini file, both OBIEE and default (empty) system:

8382  07:13:43.309065 open("/app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/odbc.ini", O_RDONLY) = 35
8382  07:13:43.309619 read(35</etc/odbc.ini>, "", 4096) = 0

After another read of the two odbcinst.ini files (per above), there's logging information written

8382  07:13:43.312345 write(31</tmp/odbc.log/driver.log>, "Aug 09 07:13:43.312 INFO  2896611072 CInterface::SQLAllocHandle: Allocating environment handle.\n", 96) = 96
[...]
8382  07:13:43.317106 write(31</tmp/odbc.log/driver.log>, "Aug 09 07:13:43.317 INFO  2896611072 Connection::SQLGetInfoW: InfoType: SQL_DRIVER_ODBC_VER (77)\n", 97) = 97
8382  07:13:43.317141 stat("/tmp/odbc.log/driver.log", {st_mode=S_IFREG|0640, st_size=179550, ...}) = 0

And then, bang.

8382  07:13:43.317198 --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x1f} ---

After which, the crashreport is written:

8382  07:13:43.317249 open("/app/oracle/biee/user_projects/domains/bi/servers/obis1/nqsserver_7059_crashreport.txt", O_WRONLY|O_CREAT|O_APPEND, 0600) = 35
[...]

So from this we can see that the ODBC driver is being loaded from the path we expected, and the configuration files that we expected are being read too. So no smoking gun - but a couple of possible problems ruled out.

Reproducing the Crash on Demand

With this kind of problem it's often a case of working through lots of different configuration settings to obtain further diagnostic evidence - which requires reproducing the problem each time. Instead of manually running the query through Answers which triggers the problem, I moved this part of the diagnostics to the command line, with nqcmd. I copied the logical SQL to a file drill-test.lsql:

EXECUTE PHYSICAL CONNECTION POOL "Apache Drill"."Apache Drill" SELECT version FROM sys.version;

and then run with:

/app/oracle/biee/user_projects/domains/bi/bitools/bin/nqcmd.sh -d AnalyticsWeb -u weblogic -p Admin123 -s ~/drill-test.lsql

gives the same result (error) but easier to do.

Aug 09, 2016 7:59:53 PM oracle.bi.endpointmanager.impl.bienv.BIEnvComponents loadFromInputStream  
INFO: Reading components from: /app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/bienv-components.xml ...

-------------------------------------------------------------------------------
          Oracle BI ODBC Client
          Copyright (c) 1997-2015 Oracle Corporation, All rights reserved
-------------------------------------------------------------------------------


EXECUTE PHYSICAL CONNECTION POOL "Apache Drill"."Apache Drill" SELECT version FROM sys.version  
EXECUTE PHYSICAL CONNECTION POOL "Apache Drill"."Apache Drill" SELECT version FROM sys.version  
[unixODBC][nQSError: 12010] Communication error connecting to remote end point: address = demo.us.oracle.com; port = 7792.[unixODBC][NQODBC] [SQL_STATE: S1000] [nQSError: 10058] A general error has occurred.

Statement preparation failed


Processed: 1 queries  
Encountered 1  errors  
Stuff Ruled Out
  • The odbcinst.ini file doesn't have to be present - strace showed it is looked for, but the result is the same even if it's not (or is but doesn't have an entry for the Drill drivers):

    4270  20:00:06.692891 open("/home/oracle/.odbcinst.ini", O_RDONLY) = -1 ENOENT (No such file or directory)
    
  • Changing the connection pool call interface to ODBC 3.5 doesn't fix things, nor does changing the database type to Apache Hadoop (grasping at straws...)

Driver Manager

One of the routes of investigation is the Driver Manager. This is for two reasons; one is that on Windows ODBC is native, the driver manager is built in. As mentioned, @cfiston has got this to work - but on Windows. So platform differences aside (he says casually), this could be something. The second reason is the difference in the driver manager that shows in the ODBC log between a successful (via iodbctest) request

Driver::Initialize: Detected Driver Manager: iODBC, 3.52.7

versus an unsuccessful one (in OBIEE):

Driver::Initialize: Detected Driver Manager: DataDirect Driver Manager, 07.14.0119 (U0115)

Before we dig into this further let's take a look at the driver manager libraries that we've got on the system. DataDirect and unixODBC are both libodbcinst.so whilst iODBC is libiodbc.so. We'll use a bit of bash magic to find all the files, and list their sizes and checksums so we can spot which are the same:

[oracle@demo odbc.log]$ locate libodbcinst|xargs -Ifoo ls -l foo
-rw-r----- 1 oracle oinstall 1380087 2015-10-13 03:04 /app/oracle/biee/bi/bifoundation/odbc/lib/libodbcinst.so
-rw-r----- 1 oracle oinstall 1380087 2015-10-03 02:59 /app/oracle/biee/bi/common/ODBC/Merant/5.3/lib/libodbcinst.so
-rw-r----- 1 oracle oinstall 1203032 2015-10-03 02:59 /app/oracle/biee/bi/common/ODBC/Merant/7.0.1/lib/libodbcinst.so
-rw-r----- 1 oracle oinstall 1239728 2015-10-03 02:59 /app/oracle/biee/bi/common/ODBC/Merant/7.1.2/lib/libodbcinst.so
-rw-r----- 1 oracle oinstall 1244304 2015-10-03 02:59 /app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libodbcinst.so
lrwxrwxrwx 1 root root 20 2016-08-08 11:55 /usr/lib64/libodbcinst.so -> libodbcinst.so.2.0.0  
lrwxrwxrwx 1 root root 20 2016-08-08 11:55 /usr/lib64/libodbcinst.so.2 -> libodbcinst.so.2.0.0  
-rwxr-xr-x 1 root root 68928 2014-08-16 19:58 /usr/lib64/libodbcinst.so.2.0.0

[oracle@demo odbc.log]$ locate libodbcinst|xargs -Ifoo md5sum foo|sort
0bfd147ff6b41daee527861143040f1b  /app/oracle/biee/bi/common/ODBC/Merant/7.1.2/lib/libodbcinst.so  
7eaee346f92169fc2e2ba5900dceefa3  /app/oracle/biee/bi/common/ODBC/Merant/5.3/lib/libodbcinst.so  
b340968ee0a2188427a66203fb0a56b7  /app/oracle/biee/bi/bifoundation/odbc/lib/libodbcinst.so  
dadcb67d26d42b0c2535a9be44d2b46f  /usr/lib64/libodbcinst.so  
dadcb67d26d42b0c2535a9be44d2b46f  /usr/lib64/libodbcinst.so.2  
dadcb67d26d42b0c2535a9be44d2b46f  /usr/lib64/libodbcinst.so.2.0.0  
eccb81df3cdaaeb83faa86dfc6187844  /app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libodbcinst.so  
ed27493fd52534e181e0e6cd29c6a48a  /app/oracle/biee/bi/common/ODBC/Merant/7.0.1/lib/libodbcinst.so

[oracle@demo odbc.log]$ locate libiodbcinst|xargs -Ifoo ls -l foo
lrwxrwxrwx 1 root root 22 2016-08-08 11:24 /usr/lib64/libiodbcinst.so.2 -> libiodbcinst.so.2.1.19  
-rwxr-xr-x 1 root root 72896 2010-06-23 11:07 /usr/lib64/libiodbcinst.so.2.1.19

[oracle@demo odbc.log]$ locate libiodbcinst|xargs -Ifoo md5sum foo|sort
44a432e25d176079cf30e805c648fc86  /usr/lib64/libiodbcinst.so.2  
44a432e25d176079cf30e805c648fc86  /usr/lib64/libiodbcinst.so.2.1.19  

What's interesting from this is that the libodbcinst.so installed within OBIEE (bifoundation/odbc/lib/) is the same size as the DataDirect 5.3 one, but a different checksum.

OBIEE uses ODBC for its own internal connectivity between Presentation Services (OBIPS) and BI Server (OBIS). We saw in the strace output above that odbctrac.so wasn't successfully loaded, so let's fix that in /app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/odbc.ini:

[ODBC]
Trace=1  
TraceFile=/tmp/odbctrace.out  
TraceDll=/app/oracle/biee/bi/bifoundation/odbc/lib/odbctrac.so  
[...]

With this enabled there's now debug information written - although in this case it's about OBIEE using ODBC to connect to its internal MDS schemas (which in 12c it looks to use ODBC for):

ppid=24928:pid= 3bd8:754f8720   ENTER SQLConnect  
                HDBC                0x01385750
                UCHAR *             0x012fbfb0 [      15] "opss_datasource"
                SWORD                       15
                UCHAR *             0x012fcba0 [       9] "BIEE_OPSS"
                SWORD                        9
                UCHAR *             0x54665b84 [4294967293] "******"
                SWORD                       -3

ppid=24928:pid= 3bd8:754f8720   EXIT  SQLConnect  with return code 0 (SQL_SUCCESS)  
                HDBC                0x01385750
                UCHAR *             0x012fbfb0 [      15] "opss_datasource"
                SWORD                       15
                UCHAR *             0x012fcba0 [       9] "BIEE_OPSS"
                SWORD                        9
                UCHAR *             0x54665b84 [4294967293] "******"
                SWORD                       -3

So back to driver managers. The DataDirect manager is not listed in the system requirements - perhaps it's not supported, perhaps it's not been tested. Let's see if our iodbctest works when we force it to use the DataDirect driver. We'll do this by setting the ODBCInst parameter in ~/.mapr.drillodbc.ini, along with the accompanying LDLIBRARYPATH. The latter is necessary for dependent libraries used by the driver manager. We can use strace to verify the paths being picked up.

First with the unixODBC driver:

[oracle@demo odbc.log]$ export MAPRDRILLINI=~/.mapr.drillodbc.ini
[oracle@demo odbc.log]$ export LD_LIBRARY_PATH=/opt/mapr/drillodbc/lib/64
[oracle@demo odbc.log]$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib64
[oracle@demo odbc.log]$ grep ODBCInstLib ~/.mapr.drillodbc.ini
ODBCInstLib=libodbcinst.so
[oracle@demo odbc.log]$ iodbctest "DSN=DrillDSN"
iODBC Demonstration program
This program shows an interactive SQL processor
Driver Manager: 03.52.0709.0909
Driver: 1.2.1.1001 (MapR Drill ODBC Driver)
SQL>SELECT version FROM sys.version

version
---------
1.7.0

result set 1 returned 1 rows.

strace shows the libodbcinst.so is loaded from where we'd expect (/usr/lib64), but that two other folders are checked first.

open("/opt/mapr/drillodbc/lib/64/libodbcinst.so", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/tls/libodbcinst.so", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/libodbcinst.so", O_RDONLY) = 5

As a debug aside, you can also use ltrace to show the library calls being made:

[oracle@demo ~]$ ltrace --demangle -s 128 -f --indent 2 iodbctest "DSN=DrillDSN"
(0, 0, 502528, -1, 0x1f25bc2)                                                                                                                      = 0x7fb61240f160
__libc_start_main(0x402110, 2, 0x7ffd6920ba08, 0x4021f0, 0x4021e0 <unfinished ...>  
  setlocale(6, "")                                                                                                                                 = "en_GB.UTF-8"
  __printf_chk(1, 0x4025ed, 0, 0x7fb60bba0174, 0x7fb611d92ee8iODBC Demonstration program
)                                                                                     = 28
  __printf_chk(1, 0x4023f8, 0x7fb611d92e10, 0x402609, 0xffffffffThis program shows an interactive SQL processor
)                                                                                  = 48
  SQLAllocHandle(1, 0, 0x602eb8, 0x402428, 0xa726f737365636f)                                                                                      = 0
  SQLSetEnvAttr(0xbdcfe0, 200, 3, 0xfffffffb, 0x7ffd6920ac10)                                                                                      = 0
  SQLAllocHandle(2, 0xbdcfe0, 0x602ec0, 0xfffffffb, 0x7ffd6920ac10)                                                                                = 0
  SQLSetConnectOption(0xbdd220, 1051, 0x402593, 273, 0x7fb611d92ee8)                                                                               = 0
  SQLGetInfo(0xbdd220, 171, 0x7ffd6920b6a0, 255, 0x7ffd6920b29c)                                                                                   = 0
  __printf_chk(1, 0x40259c, 0x7ffd6920b6a0, 0, 0Driver Manager: 03.52.0709.0909
)                                                                                                  = 32
  __strcpy_chk(0x7ffd6920b2a0, 0x7ffd6920be7a, 1024, 0x4025af, 1)                                                                                  = 0x7ffd6920b2a0
  SQLDriverConnect(0xbdd220, 0, 0x7ffd6920b2a0, 0xfffffffd, 0x602ee0 <unfinished ...>

From the above invocation, in which it seems the unixODBC driver is being used, the ODBC driver.log records otherwise:

Aug 09 21:30:32.112 INFO  1444292352 Driver::LogVersions: SDK Version: 09.05.07.1008
Aug 09 21:30:32.112 INFO  1444292352 Driver::LogVersions: DSII Version: 1.2.1.1001
Aug 09 21:30:32.112 INFO  1444292352 Driver::Initialize: Database CHAR Encoding: UTF-8
Aug 09 21:30:32.112 INFO  1444292352 Driver::Initialize: Database WCHAR Encoding: UTF-8
Aug 09 21:30:32.112 INFO  1444292352 Driver::Initialize: ANSI CHAR Encoding: UTF-8
Aug 09 21:30:32.112 INFO  1444292352 Driver::Initialize: Driver Manager WCHAR Encoding: UTF-32LE
Aug 09 21:30:32.112 INFO  1444292352 Driver::Initialize: Detected Driver Manager: iODBC, 3.52.7
Aug 09 21:30:32.112 INFO  1444292352 Driver::Initialize: Locale name: en_GB
Aug 09 21:30:32.112 INFO  1444292352 Driver::Initialize: Bitness: 64-bit

If I use unixODBC's test tool, from the same environment as above:

[oracle@demo bin]$ isql DrillDSN
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL> SELECT version FROM sys.version
+----------
| version
+----------
| 1.7.0
+----------
SQLRowCount returns -1
1 rows fetched

Then driver.log shows:

Aug 09 21:38:25.098 INFO  1851778816 Driver::LogVersions: SDK Version: 09.05.07.1008
Aug 09 21:38:25.098 INFO  1851778816 Driver::LogVersions: DSII Version: 1.2.1.1001
Aug 09 21:38:25.099 INFO  1851778816 Driver::Initialize: Database CHAR Encoding: UTF-8
Aug 09 21:38:25.099 INFO  1851778816 Driver::Initialize: Database WCHAR Encoding: UTF-8
Aug 09 21:38:25.099 INFO  1851778816 Driver::Initialize: ANSI CHAR Encoding: UTF-8
Aug 09 21:38:25.099 INFO  1851778816 Driver::Initialize: Driver Manager WCHAR Encoding: UTF-32LE
Aug 09 21:38:25.099 INFO  1851778816 Driver::Initialize: Detected Driver Manager: unixODBC, 2.2.14 or 2.3.x branch
Aug 09 21:38:25.099 INFO  1851778816 Driver::Initialize: Locale name: en_GB
Aug 09 21:38:25.099 INFO  1851778816 Driver::Initialize: Bitness: 64-bit

So ODBCInstLib is used, but the calling application also plays a role. We can see from strace that both applications are loading libodbcinst.so, but still recording different Driver Managers in the driver.log

[oracle@demo bin]$ strace isql DrillDSN 2>&1|grep odbcinst.so
open("/opt/mapr/drillodbc/lib/64/libodbcinst.so", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/tls/libodbcinst.so", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/libodbcinst.so", O_RDONLY) = 5
[oracle@demo bin]$ ^C

[oracle@demo bin]$ strace iodbctest "DSN=DrillDSN" 2>&1|grep odbcinst.so
open("/opt/mapr/drillodbc/lib/64/libodbcinst.so", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/tls/libodbcinst.so", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/libodbcinst.so", O_RDONLY) = 5
[oracle@demo bin]$ ^C

For the two above invocations, the driver is recorded thus:

[oracle@demo bin]$ grep "Driver::Initialize: Detected Driver Manager:" /tmp/odbc.log/driver.log
[...]
Aug 09 21:48:47.814 INFO  1812629248 Driver::Initialize: Detected Driver Manager: unixODBC, 2.2.14 or 2.3.x branch
Aug 09 21:49:08.840 INFO  1312765696 Driver::Initialize: Detected Driver Manager: iODBC, 3.52.7

Let's branch out a bit. nqcmd, as well as being useful for invoking OBIEE logical SQL against the BI Server, is also an ODBC client (in the same way that iodbctest and isql are).

[oracle@demo bin]$ /app/oracle/biee/user_projects/domains/bi/bitools/bin/nqcmd.sh -d DrillDSN -u foo -p bar
Aug 09, 2016 9:53:00 PM oracle.bi.endpointmanager.impl.bienv.BIEnvComponents loadFromInputStream  
INFO: Reading components from: /app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/bienv-components.xml ...

-------------------------------------------------------------------------------
          Oracle BI ODBC Client
          Copyright (c) 1997-2015 Oracle Corporation, All rights reserved
-------------------------------------------------------------------------------



        [T]able info
        [C]olumn info
        [D]ata type info
        [F]oreign keys info
        [P]rimary key info
        [K]ey statistics info
        [S]pecial columns info
        [Q]uery statement
Select Option: Q  
Give SQL Statement: SELECT version FROM sys.version  
SELECT version FROM sys.version  
--------------------------------
version  
-------
1.7.0  
------
Row count: 1  

Interesting. Now we're moving into the OBIEE stack, and a step closer to the BI Server itself. As I know you're dying to find out, the Driver Manager recorded by the above nqcmd call is:

Aug 09 21:53:03.064 INFO  706402080 Driver::Initialize: Detected Driver Manager: unixODBC, 2.2.14 or 2.3.x branch

Let's switch ODBCInstLib to iODBC now:

[oracle@demo bin]$ grep ODBCInstLib ~/.mapr.drillodbc.ini
ODBCInstLib=libiodbcinst.so.2
[oracle@demo bin]$ echo $LD_LIBRARY_PATH
/opt/mapr/drillodbc/lib/64:/usr/lib64
[oracle@demo bin]$ echo $MAPRDRILLINI
/home/oracle/.mapr.drillodbc.ini

Running the same strace tests as above we confirm that the iODBC library is being used:

[oracle@demo bin]$ strace iodbctest "DSN=DrillDSN" 2>&1|grep odbcinst.so
open("/opt/mapr/drillodbc/lib/64/libiodbcinst.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/tls/libiodbcinst.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/libiodbcinst.so.2", O_RDONLY) = 5
^C
[oracle@demo bin]$ strace isql DrillDSN 2>&1|grep odbcinst.so
open("/opt/mapr/drillodbc/lib/64/libiodbcinst.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/tls/libiodbcinst.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/lib64/libiodbcinst.so.2", O_RDONLY) = 5
^C

and the same driver manager pattern recorded for the two above invocations respectively:

Aug 09 21:57:02.826 INFO  3571013376 Driver::Initialize: Detected Driver Manager: iODBC, 3.52.7
Aug 09 21:57:07.875 INFO  3464189696 Driver::Initialize: Detected Driver Manager: unixODBC, 2.2.14 or 2.3.x branch

Running nqcmd again works as before, including with the same driver manager recorded in driver.log

Looking at the dependencies for these programs with ldd shows:

  • nqcmd

    [oracle@demo ~]$ ldd /app/oracle/biee/bi/bifoundation/server/bin/nqcmd
    linux-vdso.so.1 =>  (0x00007fffef5b2000)
    libodbc.so => /usr/lib64/libodbc.so (0x00007f8ed3248000)
    libodbcinst.so => /usr/lib64/libodbcinst.so (0x00007f8ed3036000)
    libARicu27.so => not found
    libnqsgenericodbcinterface64.so => not found
    libnqportable64.so => not found
    libnqutilitygeneric64.so => not found
    libnqutilityserver64.so => not found
    libnqsfileutility64.so => not found
    libnqutilityclient64.so => not found
    libnqsclusterutility64.so => not found
    libxerces-c.so.28 => not found
    libnqstlport64.so => not found
    libnqsserventry64.so => not found
    libnqsobjectmodel64.so => not found
    libsamemoryallocator864.so => not found
    libz.so.1 => /lib64/libz.so.1 (0x00007f8ed2e06000)
    libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f8ed2be9000)
    libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00007f8ed28e3000)
    libm.so.6 => /lib64/libm.so.6 (0x00007f8ed265f000)
    libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f8ed2448000)
    libc.so.6 => /lib64/libc.so.6 (0x00007f8ed20b4000)
    libltdl.so.7 => /usr/lib64/libltdl.so.7 (0x00007f8ed1eab000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f8ed34b0000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007f8ed1ca6000)
    
  • isql

    [oracle@demo ~]$ ldd /usr/bin/isql
    linux-vdso.so.1 =>  (0x00007ffc8278f000)
    libodbc.so.2 => /usr/lib64/libodbc.so.2 (0x00007f214b44e000)
    libltdl.so.7 => /usr/lib64/libltdl.so.7 (0x00007f214b244000)
    libreadline.so.6 => /lib64/libreadline.so.6 (0x00007f214afec000)
    libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f214adcf000)
    libc.so.6 => /lib64/libc.so.6 (0x00007f214aa3a000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007f214a836000)
    libtinfo.so.5 => /lib64/libtinfo.so.5 (0x00007f214a615000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f214b6b6000)
    
  • iodbctest

    [oracle@demo ~]$ ldd /usr/bin/iodbctest
    linux-vdso.so.1 =>  (0x00007ffdf9103000)
    libiodbc.so.2 => /usr/lib64/libiodbc.so.2 (0x00007ff5ef388000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007ff5ef16e000)
    libc.so.6 => /lib64/libc.so.6 (0x00007ff5eedda000)
    /lib64/ld-linux-x86-64.so.2 (0x00007ff5ef5dc000)
    

Of note here is that only nqcmd depends on a driver manager (libodbcinst.so) - so at a guess the other two tools interact with the ODBC drivers directly? Although the strace above did show each one loading the library, so ... ?

At the moment libodbcinst.so is a soft link to the .2.0.0 unixODBC version

[oracle@demo lib64]$ ls -l /usr/lib64/libodbc.so
lrwxrwxrwx 1 root root 16 2016-08-08 11:55 /usr/lib64/libodbc.so -> libodbc.so.2.0.0

What happens if we change this to point to the iODBC one?

[oracle@demo lib64]$ sudo ln -sf /usr/lib64/libiodbcinst.so.2 /usr/lib64/libodbcinst.so
[oracle@demo lib64]$ ls -l /usr/lib64/libodbcinst.so
lrwxrwxrwx 1 root root 28 2016-08-09 22:20 /usr/lib64/libodbcinst.so -> /usr/lib64/libiodbcinst.so.2

Same behaviour from isql and iodbctest as above (both work, both log the same driver manager as before). But this time, nqcmd reports as a different driver manager in driver.log:

Aug 09 22:24:20.514 INFO  3097786112 Driver::Initialize: Detected Driver Manager: iODBC, 3.52.7

Now let's see if we can force nqcmd to use the DataDirect manager that nqsserver is doing when it crashes:

[oracle@demo lib64]$ sudo ln -sf /app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libodbcinst.so /usr/lib64/libodbcinst.so
[oracle@demo lib64]$ ls -l /usr/lib64/libodbcinst.so
lrwxrwxrwx 1 root root 63 2016-08-09 22:27 /usr/lib64/libodbcinst.so -> /app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libodbcinst.so

The DataDirect Driver Manager library is loaded according to strace:

30100 22:30:42.267851 open("libodbcinst.so", O_RDONLY) = 3
30100 22:30:42.267898 read(3</app/oracle/biee/bi/common/ODBC/Merant/7.1.4/lib/libodbcinst.so>, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\353\6\0\0\0\0\0@\0\0\0\0\0\0\0\220\365\22\0\0\0\0\0\0\0\0\0@\0008\0\5\0@\0\34\0\33\0\1\0\0\0\5

But the driver.log still shows unixODBC:

Aug 09 22:30:43.529 INFO  181618464 Driver::Initialize: Detected Driver Manager: unixODBC, 2.2.14 or 2.3.x branch

Hmmm. Not much conclusive from this.

DriverManagerEncoding

From https://drill.apache.org/docs/configuring-odbc-on-linux/#configuring-.mapr.drillodbc.ini:

Edit the DriverManagerEncoding setting if necessary. The value is typically UTF-16 or UTF-32, but depends on the driver manager used. iODBC uses UTF-32 and unixODBC uses UTF-16. Review your ODBC Driver Manager documentation for the correct setting.

Changing it to UTF-16 in ~/.mapr.drillodbc.ini has the following effect:

  • isql works as before
  • iodbctest fails

    [oracle@demo lib64]$ iodbctest "DSN=DrillDSN"
    iODBC Demonstration program
    This program shows an interactive SQL processor
    Driver Manager: 03.52.0709.0909
    1: SQLDriverConnect = ����� (10360) SQLSTATE=̭
    1: ODBC_Connect = ����� (10360) SQLSTATE=0�
    
    
    Have a nice day.[oracle@demo lib64]$
    

    This failure is to be expected per the documentation, since iodbctest is using the iODBC driver manager which requires UTF-32

  • nqcmd connecting directly to DrillDSN works as before

  • nqcmd running the Logical SQL now works!

    [oracle@demo lib64]$ /app/oracle/biee/user_projects/domains/bi/bitools/bin/nqcmd.sh -d AnalyticsWeb -u weblogic -p Admin123 -s ~/drill-test.lsql
    Aug 09, 2016 10:47:45 PM oracle.bi.endpointmanager.impl.bienv.BIEnvComponents loadFromInputStream
    INFO: Reading components from: /app/oracle/biee/user_projects/domains/bi/config/fmwconfig/bienv/core/bienv-components.xml ...
    
    
    -------------------------------------------------------------------------------
    Oracle BI ODBC Client
    Copyright (c) 1997-2015 Oracle Corporation, All rights reserved
    -------------------------------------------------------------------------------
    
    
    EXECUTE PHYSICAL CONNECTION POOL "Apache Drill"."Apache Drill" SELECT version FROM sys.version
    EXECUTE PHYSICAL CONNECTION POOL "Apache Drill"."Apache Drill" SELECT version FROM sys.version
    -----------------------------------------------------------------------------------------------
    version
    -----------------------------------------------------------------------------------------------
    1.7.0
    -----------------------------------------------------------------------------------------------
    Row count: 1
    -----------------------------------------------------------------------------------------------
    
    
    Processed: 1 queries
    

    The Driver Manager is DataDirect as before

    Aug 09 22:48:20.825 INFO  3402434304 Driver::Initialize: Detected Driver Manager: DataDirect Driver Manager, 07.14.0119 (U0115)
    

So after all that - an incorrect configuration of the MapR ODBC driver was the culprit.

Conclusion

Hindsight is a wonderful thing - at the end of an article like this it's easy enough to wonder if strace and other tools were really necessary to get to the bottom of the issue. However, for me, using these tools is a great way of ruling out what the problem isn't.

The trick is to judge when to jump into the deep-end of system call tracing, and when to maybe take a step back and RTFM closely. Particularly if you're doing something that is supported, that is documented, then you probably wouldn't be reaching for strace. But edging away from what is supported or documented, these can be great tools to help explore how applications are running and can be made to work with other components (such as 3rd party ODBC drivers).

And if you do want the tl;dr of getting OBIEE to work with Apache Drill, it's written up using the ODBC driver over here, and with the JDBC driver in Fiston's blog post here.

Categories: BI & Warehousing

AUDIT_SYS_OPERATIONS and top-level operation

Yann Neuhaus - Tue, 2016-08-23 04:28

SYSDBA is powerful. You should use it only when you need to. And you should audit what is done when connected SYSDBA. This is achieved by AUDIT_SYS_OPERATION. But do you have an idea how much audit log will be generated? Note that in 12c, AUDIT_SYS_OPERATION=true is the default.

The documentation says:
AUDIT_SYS_OPERATIONS enables or disables the auditing of top-level operations, which are SQL statements directly issued by users when connecting with the SYSASM, SYSBACKUP, SYSDBA, SYSDG, SYSKM, or SYSOPER privileges. (SQL statements run from within PL/SQL procedures or functions are not considered top-level.)

From the documentation, you can expect that only the statements that are issued by a SYSDBA user call are logged.
Not the recursive statements.
Not the scheduler jobs.

However, this is not what happens. Look at the following:

CaptureEventLog001

On Windows, the SYS Audit goes to the Event log and it is full of those kind of statements. Those are no statements that I’ce issued when connected as SYSDBA. Those are recursive statements from the automatic statistic gathering job that run everyday. Do I want to audit that? probably not. But it fills my system log.

On Unix, this is not better. Here is a database created a few days ago with nearly no activity since then:

[oracle@CDB adump]$ ls -alrt | head
total 2341264
drwxr-xr-x 5 oracle oinstall 4096 Jul 29 16:12 ..
-rw-r----- 1 oracle oinstall 2699 Aug 19 03:15 CDB_m000_10396_20160819031532925620143795.aud
-rw-r----- 1 oracle oinstall 1150 Aug 19 03:15 CDB_ora_10402_20160819031534799868143795.aud
-rw-r----- 1 oracle oinstall 1134 Aug 19 03:15 CDB_ora_10404_20160819031535178281143795.aud
-rw-r----- 1 oracle oinstallcat 1131 Aug 19 03:15 CDB_ora_10406_20160819031535558089143795.aud
-rw-r----- 1 oracle oinstall 1139 Aug 19 03:15 CDB_ora_10408_20160819031535936355143795.aud
-rw-r----- 1 oracle oinstall 1156 Aug 19 03:15 CDB_ora_10410_20160819031536306359143795.aud
-rw-r----- 1 oracle oinstall 1165 Aug 19 03:15 CDB_ora_10412_20160819031536679750143795.aud
[oracle@CDB adump]$ ls -alrt | tail
-rw-r----- 1 oracle oinstall 1243 Aug 23 08:31 CDB_ora_9044_20160823083113966954143795.aud
-rw-r----- 1 oracle oinstall 1243 Aug 23 08:31 CDB_ora_9047_20160823083114497136143795.aud
-rw-r----- 1 oracle oinstall 1243 Aug 23 08:31 CDB_ora_9048_20160823083114567197143795.aud
-rw-r----- 1 oracle oinstall 1243 Aug 23 08:31 CDB_ora_9049_20160823083115041317143795.aud
-rw-r----- 1 oracle oinstall 1243 Aug 23 08:31 CDB_ora_9050_20160823083115311603143795.aud
-rw-r----- 1 oracle oinstall 54568 Aug 23 08:31 CDB_ora_9036_20160823083113459749143795.aud
-rw-r----- 1 oracle oinstall 1243 Aug 23 08:31 CDB_ora_9052_20160823083115922822143795.aud
-rw-r----- 1 oracle oinstall 54568 Aug 23 08:31 CDB_ora_9045_20160823083114267635143795.aud
drwxr-xr-x 5 oracle oinstall 64274432 Aug 23 08:31 .
[oracle@CDB adump]$ du -hs
8.5G .

Yes, this is two million files. 8GB of text. What will you do with that?
That’s the problem with auditing. It’s activated by default to comply with security policies, but there’s nothing to purge or archive them by default. Size grows and you cannot do anything relevant with it.

If I look at a subset of files:

[oracle@CDB adump]$ ls CDB_ora_*_20160823*aud | wc -l
8184

Only two of them are from user connections. The others have no terminal:

[oracle@CDB adump]$ grep -l "^CLIENT TERMINAL:\[0\]" CDB_ora_*_20160823*aud | wc -l
8182

Expected feature

It’s not a bug. Oracle has decided to log everything in the SYS audit. Because if they don’t, a SYSDBA connection can run a procedure or a job that looks harmless when only the top-level call is logged. That procedure may be created by any user and so do not appear in the audit trail.

So what?

Whatever the default is, the audit trail is something to manage. On Windows, the event log has a maximum size. On Linux, it fills the adump directory (or syslog if you enabled it). So you should have housekeeping jobs. You can also disable the audit so only connections are logged, but not the statements. In this case you should control who has access to SYSDBA.

 

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