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SQL Server Performance Tuning

SQL Server Performance Tuning. ABOUT ME. Aditya Badramraju Twitter: http://twitter.com/@aditya_feb22 Blog: http://adityabadramraju.wordpress.com. Agenda. SQL Server Performance Tuning Overview CPU Input/output Memory Conclusion. Slow Performance !!! . U DBA!!

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SQL Server Performance Tuning

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  1. SQL Server Performance Tuning

  2. ABOUT ME AdityaBadramraju Twitter: http://twitter.com/@aditya_feb22 Blog: http://adityabadramraju.wordpress.com

  3. Agenda • SQL Server Performance Tuning Overview • CPU • Input/output • Memory • Conclusion

  4. Slow Performance !!! U DBA!! I want application run in rocket speed

  5. So How Do I Do

  6. Monitoring

  7. Troubleshoot/Get the victim

  8. Tune

  9. Test and Implement

  10. Get the victim!! The victim for performance majorly lies in any of these areas • CPU • IO • Memory • Temp DB Bottle Necks • Poor Indexing ,query writing and maintenance

  11. CPU • Check the Task Manager • Check Perfmon Counters • If SQL Server is responsible for high CPU find the session which is consuming the CPU • Dig in to details of the sessions • Find the CPU costing queries • If the environment is OLTP beware of MAXDOP

  12. IO • DMV sys.dm_os_wait_stats is the best thing which says you are at IO crunch • Perfmon counters such as Diskreads/Sec, Diskwrites/Sec, IO queue also gives clear picture in this front. • When you found IO as culprit • Spread the data into different drives • Check the queries which costs high Logical IO • Check for DISK Defragmentation and Index Fragmentation

  13. Memory • We can get the very first glance of it through Task Manager • Perfmon Counters like Page Life Expectancy, Buffer Cache Hit Ratio, Memory Grants Pending, Free Pages • Page file configuration on the server • Adhoc Queries • Poor Query Writing • Incorrect Memory Settings • Lock of Memory Pages in 32 Bit System.

  14. TEMPDB Bottle Necks • Its used more than What we normally think • It is responsible for all Sorts, Hashes, DBCC, Index Rebuilds and more. • The bottle necks of TEMPDB are due to • Incorrect tempdb configuration • Incorrect usage of temporary variables • Unnecessary Sorts on major tables etc.

  15. Poor Indexing and maintenance • The above said problems are inter related and basic problems will be • Poor Query writing like using joins(Not appropriately of course ),Cursors, triggers etc. • Having huge index fragmentation and huge page density • No update for statistics • And lastly not having a Dedicated DBA (ATLAST I HAVE SAID THAT )!!!!

  16. Acknowledgements • Paul Randal –SQL SKILLS • Adam Machanic-Microsoft • SQL Server Internals by Kalen • Pinal Dave –SQL Authority • SQL PASS and all SQL Organizations

  17. LAST WORD I like to MAD and U??? ……

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