Re: How to compare two different SQL executions plans (question is moredeeper then seams from first look)?
- From: J.Velikanovs@xxxxxxxx
- To: Edgar Chupit <edgars.cupits@xxxxx>
- Date: Wed, 30 Jun 2004 00:41:48 +0300
Edgar,
I don't doubt we need to care about LIO from concurrency/scalability point
of view.
But for CPU utilization we can?t use LIOs statistics.
Jurijs
Edgar Chupit <edgars.cupits@xxxxx>
29.06.2004 23:55
Please respond to Edgar Chupit
To: J.Velikanovs@xxxxxxxx
cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: How to compare two different SQL executions
plans (question is more deeper then seams from first look)?
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@xxxxx
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