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One year blogging

Oracle Apex Notebook - Sun, 2008-09-21 11:00
Yes, that is right. This blog is one year old. I thank all of you out there for coming around, reading what I want to say about APEX. Thanks a ton. I hope you will stick with me for the next year too. Top 10 of most visited posts: Check all checkboxes Javascript Calendar Integration Colorful web forms Javascript Tooltip Integration Substitution string and SQL Developer Populate date field
Categories: Development

Me @ Oracle World

Carl Backstrom - Sat, 2008-09-20 18:42
Been awhile since I've posted. That whole work thing will get in the way of that on occasion.

Anyway for people heading to Oracle World .

I'll be helping run the APEX hands on lab.

S298611, 10:30 - 11:30 at Golden Gate A2, Marriott
Hands-on Lab: Extending the Oracle Application Express Framework with Web 2.0

and also will have my very own session

S298613, 17:30 - 18:30 at Salon 14/15, Marriott
Web 2.0 Development with Oracle Application Express

Past that I will be ducking in and out of sessions and unconference events as well as working the APEX booth (by far my favorite part of Oracle World).

I'm pretty excited about this years Oracle World as APEX seems to be , is ;) , huge this year.

I'll be posting updates here on http://twitter.com/carlback and on http://friendfeed.com/carlback so feel free to follow along I'll do my best to keep everyone in loop.

If your at Oracle World please stop by the APEX booth and say hello, and if your not feel free to send me questions through the above service , or http://mix.oracle.com and I'll do my best to answer them or corner someone that can.

P.S. You know it's going to be a long week when Raj calls me up because he heard a rumor I'm already in SF ;) watch that guy he's trouble, but his session will be awesome!!!!

.NET and Windows OpenWorld Sessions Filling Up Fast!

Christian Shay - Tue, 2008-09-16 10:23

Summary: Seats are filling up fast for Oracle OpenWorld .NET and Windows sessions, so use Schedule Builder and reserve a seat for yourself today!

Oracle OpenWorld will be taking over the city of San Francisco next week (September 21-25th). And once again we bring back the popular "Oracle Develop", a special 2 day intensive track of content created specifically for the Oracle developer - including a .NET developer track.

This years Oracle Develop .NET track will provide comprehensive coverage of Oracle's .NET technologies including new Oracle Database 11g features, introductory material, and deep dive content. Oracle Develop is perfect for all levels of Oracle on .NET developers, from beginner to advanced. In addition to sessions we also have a .NET Hands on Lab, which lets you get your hands dirty and take Visual Studio 2008 for a joyride! Mark Williams, the author, .NET guru and OTN "Ace Director" who has probably answered one of your questions over at the ODP.NET Forum, will be on hand with me at the hands on lab to take your questions.

Once you register, I strongly urge you to use Schedule Builder to reserve seats in the sessions you are most interested in. I recommend doing so as many of our .NET and Windows sessions look like they are getting close to capacity.

If you can't make it to Oracle Develop content this year, please visit us in the Exhibition Hall (in the database area) for your own personalized demo of our latest features from an Oracle expert.
The .NET booth is booth L41 and Windows database booth is L19.

Oracle Develop .NET Sessions at a Glance

  • NET Data Caching: Client Result Cache and Database Change Notification to Maximize Performance
  • Building Microsoft Office Applications with Oracle Database and Visual Studio
  • PL/SQL Programming for .NET Developers: Tips, Tricks, and Debugging
  • Getting Started with Oracle and .NET
  • Database Development Lifecycle with Visual Studio: SQL, PL/SQL,.NET Stored Procedures, Source Control, and Deployment
  • Hands-on Lab: Building .NET Applications with Oracle
  • Optimizing .NET Data Access Performance with Oracle Database
  • New Oracle Features for .NET Developers
  • ASP.NET Web Development with Oracle

Windows Database Sessions

  • What's New for Windows and .NET in Oracle Database 11g
  • Active Directory and Windows Security Integration with Oracle Database
  • Best Practices for Oracle Database Performance on Windows
  • Best Practices for Oracle Database and Client Deployment on Windows

Preparing for Oracle OpenWorld 2008

Pawel Barut - Sat, 2008-09-13 04:41
Written by Paweł Barut
It's just few days left to Oracle OpenWorld 2008. First of all my trip starts on Saturday 20th at 13:00 in Kraków, Poland. Then I switch planes in Munich, Germany, and land in San Francisco at 19:20. Just 6 hours ahead, but when I add 9 hours difference in time zones, that it adds up to over 15 hours travel. The worst thing will be adaptation to totally different timezone. I will stay in Americas Best Value Inn at Hallam Street - I hope this is in reasonable walking distance from Moscone Center. I've created an map on Google Maps - the street view feature is great - now I know how the hotel neighborhood looks like. I've also checked transportation services by BART.
And the most important thing - My OOW2008 Schedule:

I do not expect big changes in this schedule, but still, some smaller changes are possible. I could skip one or more sessions to see Exhibition Hall or go for Unconference.
I'm also looking forward for meeting other Oracle Bloggers during Blogger Meetup organized by Eddie Awad.
Update: I forgot to mention about After Dark at Oracle OpenWorld where are evening parties listed.

See you in San Francisco,

Related Articles on Paweł Barut blog:
Categories: Development

oracle-validated RPM also available on Oracle Enterprise Linux 5 Update 2 media

Sergio's Blog - Thu, 2008-09-11 00:23

In the comments on my previous post on the Oracle validated RPM, Frank points out that this RPM is also available on the Oracle Enterprise Linux 5 installation media, starting with Update 2. You can download" Oracle Enterprise Linux from edelivery.

I learned something new today!

Categories: DBA Blogs

Collective Intelligence 1: Building a RSS Feed Archive

Marcos Campos - Mon, 2008-09-08 22:10
For a long time I have thought that we needed data mining books written for developers. Most data mining books are written for business or data analysts. Given that, it was a pleasant surprise to read Programming Collective Intelligence: Building Smart Web 2.0 Applications by Toby Segaran. The book provides a good discussion on data mining concepts anchored with interesting examples. It also Marcoshttp://www.blogger.com/profile/14756167848125664628noreply@blogger.com5
Categories: BI & Warehousing

Back to real life

Oracle Apex Notebook - Mon, 2008-09-08 11:12
After 15 well deserved :) days of vacations in the sunny Algarve (south Portugal) I'm back to work. It is hard when I think that just two days ago I was at those wonderful beaches, eating fresh sea fish... However, not everything went fine :( I just had one of the major sports disillusion, provoked by a bad referee decision. I've just noticed that while I was away some things happened in the
Categories: Development

This blog in a cloud

Oracle Apex Notebook - Mon, 2008-09-08 11:11
After reading this post by Jake Kuramoto, I was curious to see how Apex Notebook blog looks like in a word cloud. Here is the result: Wordle is a service for generating word clouds from text sources like blog feeds. The words that appear more frequently in the source text are bigger in the final image.
Categories: Development

Get server URL in Apex

Oracle Apex Notebook - Mon, 2008-09-08 11:11
Some time ago, I had this requirement to send to the application end users, links to specific pages passing some parameters. The problem was obtaining the full URL including the server's name and port where APEX was running. The OWA_UTIL package contains utility subprograms for getting the value of environment variables. Specifically the OWA_UTIL.GET_CGI_ENV function returns the value of CGI
Categories: Development

Where to Download Oracle VM Templates

Sergio's Blog - Mon, 2008-09-08 03:28

Wim recently blogged about Oracle VM Templates, announced a few weeks ago. If you're interested in them, you can download them from edelivery.oracle.com/oraclevm.


Categories: DBA Blogs

Oracle enhanced adapter presentation at RejectConf in Berlin

Raimonds Simanovskis - Fri, 2008-09-05 16:00

I just returned from RailsConf Europe in Berlin and attended a lot of good Ruby and Rails related sessions.

I also tried to submit there my session proposal about using Rails with Oracle but as there were too many good proposals and as my topic was with too narrow topic then it was not accepted. Therefore I used opportunity to give 5 minutes presentation about Oracle enhanced adapter in RejectConf where anybody could present anything.

Here are my slides that I used in this presentation. And at least one participant was interested in this topics as he uses Rails and Oracle and did not know about my adapter.

My next public appearance is planned at Oracle OpenWorld unconference where I have recerved time slot on Thursday, September 25th at 10am. Please come there if you are attending Oracle OpenWorld and are interested in how to use Ruby on Rails with your legacy Oracle databases.

Categories: Development

Back to the future - or is that forward to the past

Nigel Thomas - Thu, 2008-09-04 13:30
I'm starting a new contract this coming Monday. I'd better keep the client confidential until I've found out how they feel about blogs, but the job revolves around data matching and data quality, using Oracle and SSA.

At the interview, I found myself less than 100m from the site of my first ever "proper" job (the old Scicon offices are now an upmarket West End hotel). So just 28 years and 1 month later, I will be sauntering along Oxford Street once again.

I'll be commuting daily at first, but I will try to stay down during the week at least some of the time if I can find somewhere cheap, clean and convenient. Any old colleagues around central London - sometime between now and Christmas we should meet up ...

New Browsers and Oracle EPM

Oracle EPM Smart Space - Thu, 2008-09-04 12:08

Whenever there are new browser technologies I am interested to see how our existing EPM products will do in them.  Right now there are 2 large browser betas first IE8 and second Google Chrome.  Both are nice browsers with rich application support but they are both betas so there are plenty of bugs.  I tried IE8 first because IE is the most popular browser and it usually does a nice job with our EPM products.

imageI was able to open Oracle EPM workspace in IE8 and logged in just fine.  The explorer screen showed up and I was able to select and open a report.  Opening the report caused a Java script error that messed up my navigation from that point on.  The script errors caused frustration but it was useable.


clip_image002[5]I tried the same thing with Chrome and got nowhere fast.  I got a gray screen when trying to load the logon page and it just kept trying to load...  I tried 9.3.1 to see if the older stuff was any better and it let me login and get to the explorer screen but I could not navigate.


So the only conclusion I can come to is that for EPM products stick to supported browsers and use the betas to play with other web sites. 

Categories: Development

Indian Megavendors

Krishanu Bose - Wed, 2008-09-03 14:02

The other day i was reading an article in http://specials.rediff.com/money/2008/aug/13slide1.htm on India's top three IT companies. As per this article, Gartner has come out with a report in which they predict that, Tata Consultancy Services, Infosys Technologies, and Wipro Technologies, collectively referred as 'India-3,' will emerge as the next generation of IT service megavendors. These vendors are increasingly being considered for strategic service deals, and will augment or, in some cases, replace today's acknowledged megavendors by revenue -- IBM Global Services, Accenture and EDS -- in this space by 2011, says Gartner.

Obviously this means there will be a lot of consolidation that is bound to happen in the IT space in India, as there are a lot of tier-2 firms who cannot match the pace of growth of the top 3 firms in India. This means some of these small IT companies will be forced to sell out as the war on margins and cornering a portion of the relatively fixed marketshare will become more acute. However, for the top-3 to actually reach the levels of present generation megavendors, apart from the cost advantage, they have to position on other parameters as well. The article talks of four critical competencies on which the emerging Indian megavendors are positioning themselves.

The competencies are: process excellence; world-class HR practices; providing high quality services at a low cost; the achievement of significant and disproportionate 'mind share' compared to their actual size.

However, the catch is to continue providing high quality services at a low cost and yet try and increase the mind-share further. With wage bills increasing and worries over global slowdown, maintaining low cost is definitely a big challenge. However, i feel where Indian top-3 companies are critically lacking is in thought-leadership. The culture of innovation and path-breaking developments is still not visible. The present day megavendors have primarily reached this position due to a large investment in innovation and thought-leadership. Anyways, interesting times ahead for all in tough situations, and obviously only the toughest will survive and prosper.

ORA-23375 when adding new master site in multi-master environment

Mihajlo Tekic - Sun, 2008-08-31 17:58
If your database global name contains a word that belongs to the list of Oracle Database Reserved Words and you are planning to add this database as a new master site in multi-master environment, you may want to consider changing the database global name so you can avoid ORA-23375 when executing DBMS_REPCAT.ADD_MASTER_DATABASE procedure.

This is especially important for those databases that have their global name containing country internet code of any of the following countries: Austria (AT), Belarus (BY), India (IN), Iceland (IS), etc. AT, BY, IN, IS are among the database reserved words.

You may experience problems even before you try to add the new master site. The creation of the database link to the new master site may fail with:
ORA-02084: database name is missing a component
However, you may not get this error in some cases, for instance when AT keyword is used; or if you put the database link name in double-quotes.

(the environment used in the examples below is DB1.MYDOMAIN.COM(master definition site, release and DB11G.MYDOMAIN.IN (master site, release

SQL> create database link DB11G.MYDOMAIN.IN
2 connect to rep_admin
3 identified by “rep_password”
4 using 'DB11G';
create database link DB11G.MYDOMAIN.IN
ERROR at line 1:
ORA-02084: database name is missing a component

SQL> create database link "DB11G.MYDOMAIN.IN"
2 connect to rep_admin
3 identified by "rep_password"
4 using 'db11g';

Database link created.

SQL> create database link DB11G.MYDOMAIN.AT
2 connect to rep_admin
3 identified by "rep_password"
4 using 'DB11G';

Database link created.

But, even if the database link creation succeeds, the attempt to add the new master site would definitely fail with:
ORA-23375: feature is incompatible with database version at global database name

SQL> begin
2 dbms_repcat.add_master_database(
3 gname=>'TEST_GROUP',
4 master=>'"DB11G.MYDOMAIN.IN"',
5 use_existing_objects =>true,
6 copy_rows =>false,
7 propagation_mode=>'ASYNCHRONOUS');
8 end;
9 /
ERROR at line 1:
ORA-23375: feature is incompatible with database version at DB11G.MYDOMAIN.IN
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.DBMS_REPCAT_MAS", line 2159
ORA-06512: at "SYS.DBMS_REPCAT", line 146
ORA-06512: at line 2


SQL> begin
2 dbms_repcat.add_master_database(
3 gname=>'TEST_GROUP',
4 master=>'DB11G.MYDOMAIN.AT',
5 use_existing_objects =>true,
6 copy_rows =>false,
7 propagation_mode=>'ASYNCHRONOUS');
8 end;
9 /

ERROR at line 1:
ORA-23375: feature is incompatible with database version at DB11G.MYDOMAIN.AT
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.DBMS_REPCAT_MAS", line 2159
ORA-06512: at "SYS.DBMS_REPCAT", line 146
ORA-06512: at line 2

If you turn 10046 trace event you can notice that the error occurs when DBMS_REPCAT_RPC.REPLICATION_VERSION_RC and DBMS_REPCAT_UTL2.REPLICATION_VERSION procedures are invoked against the new master database.

PARSE ERROR #39:len=73 dep=1 uid=61 oct=47 lid=61 tim=1191209094695404 err=6550
BEGIN sys.dbms_repcat_rpc.replication_version_rc@DB11G.MYDOMAIN.IN (:rv);END;
PARSE ERROR #39:len=72 dep=1 uid=61 oct=47 lid=61 tim=1191209094702737 err=6550
BEGIN sys.dbms_repcat_utl2.replication_version@DB11G.MYDOMAIN.IN (:rv);END;

To solve this problem the global name of the new master database should be changed. Once the global name is changed to value that does not contain any reserved word, you should be able to add the database to the replication environment.

In the example below, I will try to add a new master site which global name was changed to DB11G.FOO.BAR

SQL>conn sys/***@DB11G as sysdba
SQL> alter database rename global_name to DB11G.FOO.BAR;

Database altered.

SQL> conn rep_admin/rep_password@DB1
SQL> create database link DB11G.FOO.BAR
2 connect to rep_admin
3 identified by "rep_password"
4 using 'DB11G';

Database link created.

SQL> begin
2 dbms_repcat.add_master_database(
3 gname=>'TEST_GROUP',
4 master=>'DB11G.FOO.BAR',
5 use_existing_objects =>true,
6 copy_rows =>false,
7 propagation_mode=>'ASYNCHRONOUS');
8 end;
9 /

PL/SQL procedure successfully completed.

SQL> column dblink format a30
2 from dba_repsites;

------------------------------ - -

There are few ways to find Oracle PL/SQL reserved words:

  2. Oracle documentation (PL/SQL Reserved Words and Keywords). Check your version specific documentation available on http://tahiti.oracle.com

  3. Issue HELP RESERVED WORDS (PL/SQL) from Sql*Plus (if Sql*Plus help is installed).

Importing Payments and Paid Invoices into Oracle - Oracle needs to provide an API

Krishanu Bose - Sun, 2008-08-31 11:35
How many of us had a requirement of importing paid invoices and their corressponding payment details to Oracle? I would say many. But strangely till date there in no straight forward method to import payments into Oracle. I feel its time that Oracle comes up with a standard process like an API to handle this business need.
There are a few workarounds to this scenario. A direct update of Oracle base table is one but this comes with the risk of losing support from Oracle.
The other, more robust way would be to use the manual payment feature of Oracle to record such payments that have been already done in the earlier system. However, automating this process using a batch program is a challenge.
Do put in your comments in case you have a soultion to this problem which would help a lot of people out there.


Sergio's Blog - Fri, 2008-08-29 05:51

Here's another post from the old blog, harvested from archive.org

The other day I was playing with some Python and cx_Oracle, a Python module for connecting to Oracle databases. While cx_Oracle seems to work great, I found the documentation light on examples. Because I follow Tom Kyte's advice closely, I was trying to instrument my code with some calls to DBMS_APPLICATION_INFO. As it turns out, the cx_Oracle connection object has write only attributes to set module, action, and clientinfo.

Here's a quick example of that in action (warning: newbie Python ahead)

-bash-3.00$ python
Python 2.3.4 (#1, Feb  2 2005, 11:44:49) 
[GCC 3.4.3 20041212 (Red Hat 3.4.3-9.EL4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cx_Oracle
>>> con=cx_Oracle.connect ("hr/hr")
>>> cur=con.cursor()
>>> con.module="python module"
>>> con.action="some big query"

>>> cur.execute ("select 1 from dual")
[<cx_Oracle.NUMBER with value None>]
>>> con.action=""
>>> con.module=""
>>> con.close()

Before closing the connection with con.close(), this is what was observed in the database:

SQL> select sid, module, action from v$session where module is not null 
  2  /
       SID MODULE                                           ACTION
---------- ------------------------------------------------ --------------------------------
        22 sqlplus@captain.us.oracle.com (TNS V1-V3)
        26 python module                                    some big query

Categories: DBA Blogs

Out Now!! Application Express 3.1.2

Anthony Rayner - Fri, 2008-08-29 02:21
APEX 3.1.2 is now available for download and fixes the following bugs. You can get hold of it by either:
  • Downloading the full version from OTN.

  • Download the patchset 7313609 from METALINK.
If your unsure about which download you need, please read Joel's blog. As Joel says, if your upgrading from any APEX version pre-3.1, then you'll need to use the full OTN release (which includes the version that comes pre-installed with 11gR1).

For details on future plans, please take a look at our Statement of Direction, which was updated just under 3 weeks ago with details of the 'Forms Converter' of APEX 3.2 and 'Websheets', 'Updateable Interactive Reports', 'Extensible Item Framework' and much more of APEX 4.0.

Happy patching!

Categories: Development

travelling trace file

Claudia Zeiler - Thu, 2008-08-28 15:23
I just noticed a detail that I don't like.

We had an error logged in the alert log. It informed me that details were in
db_ckpt_1234.log. Fine, but there was no such log in the bdump directory.

The dba who was here before me wrote a nice script to run every Sunday to clean up old trace files. What he didn't think of is that the trace files seem to be written per session, and that the checkpoint 'session' continues from instance start up.
His script came along and happily moved the trace file to a backup_bdump directory. Oracle couldn't find it and didn't write the details.

One more fix to make.


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