Sunday, January 29, 2012

How to rename SQL Tuning Set ( STS )

Rename SQL Tuning Set‎( STS )

We can use SQL Performance Analyzer (SPA) to evaluate impact on SQLs of 11g R2 database upgrade from 10.2 .So created some demo , example ( with full code ). EM was very good option , but still preferred sql,pl-sql, command / api.

We all know to, use SPA for 10.2 to 11.2 database upgrade , we need one intermeiate 11g DB.
So we can run trial remotely.So we collected SQL Tuning Set (STS ) ( using demo code ) from Multiple databases and import on intermediate 11g DB. Problem started when unpacking STS, collected from different production / Test environment having same name because all
used demo code :).

So started looking for solution , is there any way to rename STS !!!! and end up with following code

-- Create new STS and copy from exiting one
DECLARE
l_cursor DBMS_SQLTUNE.sqlset_cursor;
BEGIN
-- Create STS
DBMS_SQLTUNE.create_sqlset(sqlset_name => 'STS_DBNAME_CMUL',description => 'new STS SQL tuning set from XYZ DB');
OPEN l_cursor FOR
SELECT VALUE(r)
FROM TABLE (DBMS_SQLTUNE.select_sqlset (
'STS_RAG_CMUL' -- old sqlset_name which need to rename
)
) r;
DBMS_SQLTUNE.load_sqlset (
sqlset_name => 'STS_DBNAME_CMUL',
populate_cursor => l_cursor);
-- Drop STS
dbms_sqltune.drop_sqlset('STS_RAG_CMUL');
close l_cursor;
END;
/

Sunday, September 5, 2010

Sangam’10: All-India Oracle Users Group (AIOUG) Annual Conference

Sangam’10: All-India Oracle Users Group (AIOUG) Annual Conference



The All India Oracl Users Group (AIOUG) presented Sangam 2010, a two-day(3-4-Sep-2010) Oracle Users Conference held in Hyderabad. Sangam 2010 hosted multiple sessions by international and Indian experts like Jonathan Lewis , Rittman , Iggy Fernandez etc.




Jonathan Lewis & Virag Sharma


The event was very good and opportunity to learn from experts. Sangam 2010 started with Murali welcome note followed by Presentation, by Roland Slee, Vice-President, Database Product Management, Oracle Asia Pacific & Japan.


First technical session was from Jonathan Lewis on "Writing Optimal SQL". This One day Presentation was divided in to two , 1/2 day sessions. Conference room packed for his sessions, Jonathan Lewis Presentation was main attraction for Sangam 2010. After Lunch , there were 2 Conference room for different sessions and audience can choose session as per there interest.

Sponsors "OSI Consulting" presentation on "Cross Platform migration challenges and time reduction techniques" was pretty good then expected. After "OSI Consulting" presentation, RAC SIG meeting held. In this meeting Satyendra Kumar , explained things about RAC SIG. In the end of "RAC SIG" meeting Satyendra looking leader for various city , for Delhi/NCR, I proposed Aman Sharma’s name and latter learned that Aman recently become Oracle ACE.

Session “Tips and Best Practices for DBA’s” from Francisco , was in soo much demand that Conference room 2 overflowed and finally session held in Conference room 1.

Rittman and Vivek took one session in Sangam 2010 and unfortunately , Not able to attend any of them.In the end of Sangam 2010 Oracle Users Conference, Jonathan Lewis took 1 Hr question and Answer session, that was pretty good.


Tuesday, April 13, 2010

Certain things in this world

"In this world nothing can be said to be certain but death and taxes."
--Benjamin Franklin

Monday, September 28, 2009

Module name for logon trigger in 11g R2 AWR report

Today while working on Production performance tuning, We came across one difference in awr report of 11g R1 and 11R2

In oracle 11g R1 AWR report logon trigger modelue name usually come like
sqlplus / perl / Mid Tier@server_name_from_it_login

But in 11g R2 AWR report logon trigger modelue name usually come like oraagent.bin@DB_SERVER_WHERE_IT_RUN

New change looks more logical because DB server running logon trigger code ,
not the user.




# Excerpt from 11g R1 AWR report
# In below given example app678 is server name from where
# user logged in to database using sqlplus

Module: sqlplus@app678utl (TNS V1-V3)
UPDATE scott.MY_AUDIT SET LAST_LOGIN = SYSDATE WHERE XYZ_USERNAME = :B1


#Excerpt from 11g R2 AWR report
#In below given example apps001 is database server

Module: oraagent.bin@apps001 (TNS V1-V3)
UPDATE scott.MY_AUDIT SET LAST_LOGIN = SYSDATE WHERE XYZ_USERNAME = :B1



Friday, September 4, 2009

Oracle Database 11g Release 2 New Features : Edition based redefination


Every release has some Major changes , which we usually says New Features.Some of these features dominate the version, For example 11g R1 has SPA , DB Replay Active standby etc. Same this Oracle Release ( Oracle Database 11g Release 2 ) has some New features for which this release will be known in feature. These features are "Edition based redefination"


Most likely these features designed to give big support to APPS upgrade ( ie Oracle E-Business suite upgrade). When you upgrade APPS database , it need lots of down time , hope, using these new features APPS upgrade will take less time in future.


This feature will allow application upgrade( AS DBA , i would prefer to say Online Database object upgrade) with Minimum down time or may be zero down time. I consider this feature as one step toward ZERO DOWN time for application upgrade.


In 10g statistics collected on table published immediatly, That usually cause lots of performance issue. In oracle 11g r1 there is feature, for collecting stats on tables and publishing stats , as per need to avoid performance issue due to stats collection.

Taking similar feature to next step , 11g R2 has feature "REDEFINITION" , which upgrades objects , but not published immediately, also database can have multiple Editions of objects definition. Of-course there are, some limitation



Check Default Edition

SQL>
1 SELECT PROPERTY_VALUE FROM DATABASE_PROPERTIES
2* Where PROPERTY_NAME = 'DEFAULT_EDITION'
SQL> /

PROPERTY_VALUE
--------------------------------------------------------------------------------
ORA$BASE



Changing Edition at session or Database level

SQL> ALTER SESSION SET EDITION=ora$base;

Session altered.

SQL> ALTER DATABASE DEFAULT EDITION =ora$base;

Database altered.





Grant create or drop edition to user

SQL> GRANT CREATE ANY EDITION, DROP ANY EDITION to virag;

Grant succeeded.


Enable Edition on schema / User

SQL> ALTER USER virag ENABLE EDITIONS force;


Of-course there are, some limitation......

Will add more ......soon , for How to...


Reference

19 Edition-Based Redefinition

More Post on Oracle RDBMS Database 11g R2 ( Release 2 ) 

Oracle 11g Release 2 (11.2 ) New Features : SCAN - Single Client Access Name
11G R2 New Feature : Purge audit trail records using DBMS_AUDIT_MGMT
Oracle Database 11g Release 2 New Features : Edition based redefination

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