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Queries or Query Slow after Upgrade...

edited Apr 7, 2016 1:28PM in SQL Performance (MOSC)

Hello,

As a performance engineer, I would say the key to optimal performance is prevention.  I frequently get service requests where query or queries are slow after upgrade.  Often there were no tests done before the upgrade.  Assumption was that everything should work the same as in previous versions.  This is a wrong assumption, as each versions have different optimizer feature or enhancements which may cause plan changes and/or performance degradation.  So thorough testing is recommended before making any major changes.  One such tool to use is real application testing.  This tool tests the environment changes and reveal outcomes of those changes.  Corrections can be made before the upgrade, preventing potential performance disasters.  Read following note to read about real application testing tool and try it:

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