Re: How to compare two different SQL executions plans (question is more deeper then seams from first look)?

From: Edgar Chupit <edgar.chupit_at_rs.lv>
Date: Wed, 30 Jun 2004 07:24:00 +0300
Message-ID: <771460250.20040630072400@rs.lv>

Hello Jurijs,

JVal> Fastest from two SQL (or SQL execution plans) will be SQL with lower LIO JVal> indicator.

We still have to remember about "scalability" (latches/locks), correct me if I'm wrong, but you still have to chose statement with lowest lio, because even if the cpu_usage is the same as with statement with larger lio count, the statement with smaller lio count will scale better. You can use package similar to T.Kytes run_stats or directly query v$mystat to see other meaningful characteristics.

I guess rule to minimize lio count can still apply, however as we all know, there is no golden rules that apply to all possible cases.

--

Best regards,

 Edgar                            mailto:edgars.cupits_at_rs.lv



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Received on Tue Jun 29 2004 - 23:21:18 CDT