RE: Distinguising one SQL execution from another
- From: Smiley John - IL <SMILEYJ@xxxxxxxx>
- To: 'John Kanagaraj' <john.kanagaraj@xxxxxxx>
- Date: Tue, 12 Oct 2004 12:08:11 -0500
I know that I can get all of this from 10046 traces, including the recursive
SQL. I've been using them for years and thanks to Cary and others, I know
how to interpret them pretty well. The issue is that gathering these traces
is expensive - you can't expect to run them all of the time and certainly
not for all sessions on a production database. What I'm not convinced of
yet is that this is the only way to get the information I'm looking for.
What I'm looking for is a light weight method to get a rough idea of how
much time (elapsed and CPU) each session spends executing (broken out by
parse, execute and fetch if I can get it) each SQL statement it submits,
taking recursive SQL into account. This would be a monitor that runs
continuously on heavily loaded production systems. 10046 traces do not fit
the bill.
I'd like to be able to do this with SQL against V$ and/or X$ tables, but I'd
consider using a direct SGA attach method such as described by Kyle Hailey.
I just need to know where to look in the SGA for the information.
John Smiley
-----Original Message-----
From: John Kanagaraj [mailto:john.kanagaraj@xxxxxxx]
Sent: Tuesday, October 12, 2004 11:48 AM
To: Smiley John - IL
Subject: RE: Distinguising one SQL execution from another
Hi John,
I think we agree this can be obtained _only_ from a 10046. The issue still
is that you will need to turn on/off the trace for all such sessions and
spend time collecting/analyzing the trace files. A 10046 trace even covers
recursive SQL btw. I agree - what we need is a tool that can parse a bunch
of tracefiles and spit out that figures you want - not impossible, given
that we have the likes of Perl, but just too much to analyze...
Let us know if you get to do this!
John
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