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RE: Streams

From: Kerber, Andrew <>
Date: Wed, 13 Dec 2006 09:42:21 -0600
Message-ID: <>

My experience with the automatic memory management is that it works fine if you have plenty of memory available. However, if you are limited in memory for whatever reason it will actually cause major performance problems. I didn't get into the details (these were production instances), but I suspect Oracle gets to a point where it is too busy trying to juggle too little memory among the various pools, and cant execute its everyday business.

Andrew W. Kerber
Oracle DBA

"If at first you dont succeed, dont take up skydiving"

-----Original Message-----
[] On Behalf Of Remigiusz Sokolowski Sent: Wednesday, December 13, 2006 9:30 AM To:
Cc:; Subject: Re: Streams

Job Miller wrote:
> if you are trusting of the auto memory management stuff, the streams
> pool is now self adjusting in 10gR2, so that you shouldn't see these
> kind of errors. It *should* borrow memory from other pools to satisfy

> these moments of increased use during PQ operations.
> Job

Well, I suppose this may be a little controversial, but we used auto memory management and came to conclusion it is a major source of some of our problems.
The idea is fine and we suppose it works great for instances with less turbulent memory structure changes
However since we started with ASMM, we experienced several major server failures, while working with static settings it was not the case. Of course now we have to bounce server to change settings, but still it is better to have a control over shutdown process.


Remigiusz Sokolowski <>
WP/PTI/DIP/ZAB (+04858) 52 15 770
MySQL  v.  4.x
Oracle v. 10.x


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Received on Wed Dec 13 2006 - 09:42:21 CST

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