RE: How to obtain session-specific memory dumps?

From: Herring Dave - dherri <>
Date: Wed, 19 Aug 2009 07:50:35 -0500
Message-ID: <>

If it helps any, I found in my notes how to dump various memory sections you referenced:
  • To dump PGA, SGA, and/or UGA information. ALTER SESSION SET EVENTS 'immediate TRACE NAME global_area LEVEL <level>';

level 1: pga

2: sga
3: pga+sga
4: uga
5: pga+uga
6: sga+uga
7: pga+sga+uga

ALTER SESSION SET EVENTS 'immediate TRACE NAME heapdump LEVEL <level>';

level 1: PGA

2: SGA
4: UGA
8: CGA - current all

16: CGA - user call
32: large pool

I'm sure I got this from Tanel or some other Oracle guru.

David C. Herring | DBA, Acxiom Database Services  

630-944-4762 office | 630-430-5988 cell | 630-944-4989 fax 1501 Opus Pl | Downers Grove, IL, 60515 | U.S.A. |  

-----Original Message-----
[] On Behalf Of Rich Jesse Sent: Tuesday, August 18, 2009 11:18 AM
To: Oracle L
Subject: Re: How to obtain session-specific memory dumps?

Hi Niall,

> If you can enable trace then they'll be in the 10046. As for dumping
> the uga I *think* there's an event for that, I'll look it up when I
> get back. If not I expect Tanel Poder has something on his site.

The issue at hand is that the identifying SQL would have been run potentially hours in the past, so a 10046 trace wouldn't help.

After an off-list conversation and experimentation, I'm going to be relegated to using Log Miner. I believe that the data I'm after is just too
transient to reliably capture in the UGA, PGA, SGA, or any other TLA.

Thanks much!


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Received on Wed Aug 19 2009 - 07:50:35 CDT

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