RE: Re[2]: Physics of the FILTER operation within SQL_PLANE.

From: John Kanagaraj <john.kanagaraj_at_hds.com>
Date: Wed, 30 Jun 2004 20:55:18 -0700
Message-ID: <35CFD500D7BDCE43B9030BBA5979DC18015A37A6@ussccem13.corp.hds.com>

Jonathan,

>You can also play around with v$sql_workarea to get some idea
>of what big operations have used a lot of CPU (rather than
>hammering v$sql - which is a bit labour intensive and latch-
>unfriendly in a highly concurrent system).

I thought that queries on v$sqlarea were to be avoided in favour of v$sql since the former requires a group by on x$kglcursor while the latter is a simple select on x$kglcursorr? Would that not prolong the query and increase the chances of latch contention when v$sqlarea is queried instead of v$sql? [I checked this on 8.1.7, 9.2.0.4 and 10.1.0.20.]

Thanks for all your (very valuable) inputs to this list! John Kanagaraj

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Received on Wed Jun 30 2004 - 22:52:14 CDT