Comments on: System Statistics 3 http://jonathanlewis.wordpress.com/2007/10/17/system-statistics-3/ Just another Oracle weblog Fri, 24 May 2013 13:27:07 +0000 hourly 1 http://wordpress.com/ By: tylermuth http://jonathanlewis.wordpress.com/2007/10/17/system-statistics-3/#comment-22660 Thu, 18 Oct 2007 04:00:05 +0000 http://jonathanlewis.wordpress.com/2007/10/17/system-statistics-3/#comment-22660 Funny you posted this today… I used these two parameters in a demo the other week, since they come up so often. I was giving a talk on 11g New Features, so I took a SQL Tuning Set (a couple of minutes running an APEX app), and started up the SQL Performance Analyzer. It allows you to re-run the tuning set under 1 set of conditions (I chose the default values for those 2 parameters), then change some conditions and re-run the sql in the tuning set. It then compares the results of every statement, including sql that improved ore regressed, and plans that changed. I (and hopefully some people in the audience) found it to be a very effective tool to measure the results of a change, rather than just guessing.

Sorry to spiral down into an 11g pitch, but the SQL Performance Analyzer rocks!

Tyler

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