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oracle-hot-backup-concept – Revisitied!!!
In 2010 i had posted the blog with the hot backup concept which was explained by Howard (aka,HJR on Forums) - http://aprakash.wordpress.com/2010/06/27/oracle-hot-backup-concept/ Recently i read another...
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Enq: FB contention – No its not Facebook Contention
I am not a facebook fan neither an addict of it, but i still got to see “enq: FB contention”…thats bad . Well this was for the first time i saw this wait event and it was on 11.2.0.2 version.Mostly,...
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Optimizer Statistics Whitepaper
The CBO team has released two white papers on Optimizer.The first paper was released in Nov 2011, which was titled “Understanding Optimizer Statistics” and this month Apr 2012, they have released “Best...
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ORA-15027: active use of diskgroup “DATA” precludes its dismount
As i wanted to test few thing related to asm diskgroup on my test box, had to drop the diskgroup. Before dropping the diskgroup had dropped the database using RMAN. A S M D I S K G R O U P S P A C E U...
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ORA-00600:[kcbsor_2], [3], [2]
Recently we had a node crash of one node in 3-node 11.2.0.3 RAC database configuration.The alert log showed - Thu Apr 26 00:15:16 2012 Hex dump of (file 488, block 345039) in trace file...
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ORA-20003: You are not allowed to alter password user
Today while working on UAT database refresh activity, had a step to change all schemas password to a common one. begin for x in (select username from dba_users ) loop execute immediate 'alter user...
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Change in Database link – 11gR2
A little change in dblink from 11gR2 - SQL> conn anand/anand123 Connected. SQL> SQL> @db_link OWNER DB_LINK USERNAME HOST ------------------------------ ------------------------------...
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Index Sample Size
Recently i was asked a question, what would be the sample size percentage for indexes when tables stats are gathered with estimate percent of 5 and cascade set to true.My answer to it was 5 within a...
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Index Range Scan and db file scattered read as session wait event
I was asked to check a session which was running for more than expected time on 11.2.0.3 single instance database.The session was running a simple select statement 05:03:09 SYS@xx4040 > @sqlid...
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Mining DDL from LogMiner
One may sometimes need to find the ddl which ran on the database at some certain period of time.If auditing is enabled for the you can get the details using various *_audit_* views. In case, its not...
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ORA-06553: PLS-306: wrong number or types of arguments in call to ‘OGC_Y’...
Recently i had faced “ORA-06553: PLS-306:” error while taking an export using expdp for table using “query” parameter. $ expdp directory=TEST_DPUMP_DIR dumpfile=test_url.dmp logfile=test_url.log...
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Loading SQL Plans into SPM using AWR
SPM (SQL Plan Management) has been an useful solution for performance issues due to change in execution plan.As mentioned in Oracle Optimizer team’s blog – SQL Plan Management (SPM) allows database...
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Interesting blogs after OOW
It has been long time since i have posted something. After the OOW week and 12c db version being on its way, there have been few blogs which i would recommend to read...
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ORA-26723: user “XXXXX” requires the role “DV_GOLDENGATE_REDO_ACCESS”
While starting the extract on UAT DB env which had been recently moved to exadata we got the below error.As we had redo and archive logfiles on ASM, we used “TRANLOGOPTIONS DBLOGREADER” in extract...
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UPGRADE CHECKPOINTTABLE – Goldengate
We have a goldengate setup wherein 3 different GoldenGate clients connects and replicat to one target database.Below are the versions being currently used 11.1.1.1, 11.2.1.0.0 and 11.2.1.0.3. The...
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Internals of Active Dataguard – A must read
I found the below blog interesting and feel its a must read to enchance knowledge on Active DataGuard http://sai-oracle.blogspot.in/2012/11/internals-of-active-dataguard.html Happy reading Filed under:...
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DBCA failing with “Diskgroup XXX is not compatible for database usage”
Today a friend of mine pinged me an error while he was trying to create database using DBCA from 11.2.0.3 RDBMS home on an exadata box.Screenshot of the error is below The error was easy to understand...
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2012 in review
The WordPress.com stats helper monkeys prepared a 2012 annual report for this blog. Here’s an excerpt: 19,000 people fit into the new Barclays Center to see Jay-Z perform. This blog was viewed about...
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Lets welcome 2013
Wishing everyone a very happy and prosperous New Year 2013.In this New Year, may you always be blessed with contentment, peace and abundance. With 12c releasing in 2013, it would be a happening Year...
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ORA-38500: Unsupported operation: Oracle XML DB not present
While trying to import using impdp got the below error Table "ANAND"."TEST" exists and has been truncated. Data will be loaded but all dependent metadata will be skipped due to table_exists_action of...
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