DBA Blogs

ACS, SQL Patch and SQL Plan Baseline

Hemant K Chitale - Mon, 2016-07-04 03:49
Marko Sutic's blog post on Adaptive Cursor Sharing and SQL Plan Baselines, with an example of SQL Patch as well.
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Categories: DBA Blogs

expdp from physical standby database

Tom Kyte - Sun, 2016-07-03 13:46
Have a good day I am trying to export using expdp from the standbay server to offload the load from the production So I follow Oracle Doc ID : 1356592.1 but I get the follwing error Export: Release 11.2.0.4.0 - Production on Sat Jul 2 18...
Categories: DBA Blogs

How do instead-of-triggers work

Tom Kyte - Sun, 2016-07-03 13:46
1)After updating on complex view by using instead of trigger which table will affect first and why.
Categories: DBA Blogs

impdp parallel

Tom Kyte - Sun, 2016-07-03 13:46
Dear TOM when i impdp a db user with parallel parameter,does it really create the indexes with the parallel degree which i specified? thank you.
Categories: DBA Blogs

Questions about performance tuning.

Tom Kyte - Sun, 2016-07-03 13:46
I am working as plsql developer with 2 years of experience and I have some doubts which listed below. 1- What are the basic concepts I should know as a junior engineer about performance tuning. 2- What is the performance of " select * from Emp...
Categories: DBA Blogs

Dataguard in SE edition

Tom Kyte - Sun, 2016-07-03 13:46
I know that oracle 11g SE edition does not support any data guard. so Is it possible to create a physical standby database with RMAN on SE edition? help
Categories: DBA Blogs

why ref cursor is inefficient that regular cursor

Tom Kyte - Sun, 2016-07-03 13:46
I have seen many posts and observed that Ref Cursors are inefficient when compared to Regular cursors. it would be great if you explain me what happens internally and why ref cursors are inefficient than regular cursors.
Categories: DBA Blogs

OOW

Tom Kyte - Sun, 2016-07-03 13:46
Hello Sir, Can we have your presentation from OOW 2010? Thanks & Regards
Categories: DBA Blogs

Getting values dynamically

Tom Kyte - Sat, 2016-07-02 19:26
Hi, I will pass table_name tabl1 and its primary key value pk=(some value). My requirement is suppose there is table1, its has primary key pk1 and also it has unique keys ak1,ak2 , And its one of unique keys is foreign key to table2, now i require...
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Links for 2016-07-01 [del.icio.us]

Categories: DBA Blogs

Count months 15 days record.

Tom Kyte - Sat, 2016-07-02 01:06
Hi, I want to count records from my database table on every month's 15 days count in respect any group by Id. Like : GroupBy_Id Count statDate EndDate 5 15 01-Mar-2016 15-Mar-2016 5 2 16-M...
Categories: DBA Blogs

How to schedule a script in sql developer

Tom Kyte - Sat, 2016-07-02 01:06
Hi; I have tried many ways to schdule an a script using sql developer;But for these scripts those are failed.But those can nicely run using built in oracle sql-plus.i can use the script by using @ sign and with the file name (eg : @filename) Here...
Categories: DBA Blogs

SQL Server 2016 TCO

Tom Kyte - Fri, 2016-07-01 07:06
Team, i was going through this link. https://blogs.technet.microsoft.com/dataplatforminsider/2016/06/01/sql-server-2016-is-generally-available-today/ Comparing the cost of SQL Server 2016 with Oracle 12c, Oracle cost 12x more. We know Ora...
Categories: DBA Blogs

Block user account to PRIMARY production server and move them to the REPORTING STANDBY Db.

Tom Kyte - Fri, 2016-07-01 07:06
We are planning to all our Business users to use our read only Active data guard standby database and restrict them using the Primary production database using logon trigger. But as part of security, users have to change their passwords every 60 ...
Categories: DBA Blogs

How to validate the XML data exists in the XML table

Tom Kyte - Fri, 2016-07-01 07:06
Hi Tom, Can you please help me on how to validate the XML data available in the XML table. I have one XML table as: CREATE TABLE TEST_XML OF XMLTYPE XMLTYPE STORE AS SECUREFILE BINARY XML; And the data as: INSERT INTO TEST_XM...
Categories: DBA Blogs

Would there be a better way of improving the performance?

Tom Kyte - Fri, 2016-07-01 07:06
I have a code as shown. Objective of this piece of code is to give a report on counts for student enrollments, student absences and percentage present in the district starting from the first day of school up until the last day (i.e. a total of 18...
Categories: DBA Blogs

Number filtering from Oracle with Decimal

Tom Kyte - Fri, 2016-07-01 07:06
Hi Team, We had a situation where the customer is pulling a report from a table. This table has a number format as number (5,2) . They have a value 9 and also its updating another value as 9.00 while selecting it from the table if we use to_char(n,9...
Categories: DBA Blogs

ORA-27125: unable to create shared memory segment

Tom Kyte - Fri, 2016-07-01 07:06
Have an error when trying to start DB - ORA-27125: unable to create shared memory segment SVR4 Error: 22: Invalid argument
Categories: DBA Blogs

PLSQL profiling and auditing

Tom Kyte - Fri, 2016-07-01 07:06
1)In 100 lines of plsql program I have raised performance issue how to find which line occur the performance issues. 2)Is there any way in which i can find out when a stored procedure was last executed in oracle. NOT only a procedure am looki...
Categories: DBA Blogs

tuning array join

Tom Kyte - Fri, 2016-07-01 07:06
hi, i write relating the 71th statment of the following link. https://livesql.oracle.com/apex/livesql/s/dif16pb1eyri6hmzxxr1wg1zb i've to speed up this cursor: <code> cursor v3(c1 redd_tbTotali, c2 redd_tbPatrim) is select a1.prod...
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