Memory Footprint For Dedicated Server Processes More Than Doubled After 11g Upgrade On AIX Platform

Another one I categorize under 'I should write this down before I forget'.

Connor Mcdonald - Oracle geek and entertainer extraordinaire - shared this with me last week. Apparently, he was having some memory issues after upgrading to 11gR2 under AIX. As we run 80% of our databases under AIX, I thought I should make a mental note about it (some may call it a blogentry).

For those with metalink access - lookup note id ID 1246995.1 titled 'Memory footprint for dedicated server processes more than doubled after 11g upgrade on AIX platform'.

The symptoms are :

excessive memory utilization for dedicated server process after upgrade to 11.2.0.1 or 11.2.0.2 on AIX
svmon on oracle OS process id shows size of USLA, User-Space Loader Assistant, heap of about 7M bytes

Example

svmon -P <PID>

outputs

11.2.0.1.0 -> 7M bytes (=USLA x 4k page size)
11.1.0.7.0 -> 60KB
10.2.0.4.0 -> 420KB

Example on 11.2.0.1 (unpatched)

svmon -P 1368120 | grep USLA

10e811d 9fffffff clnt USLA text,/dev/hd2:8227 s 17 0 - -

10d89b9 80020014 work USLA heap sm 0 0 1895 1895 ---> x4K = 7Mb

Example on 11.2.0.1 (patched)

c291c2 80020014 work USLA heap sm 31 0 0 31 ---> x4K = 124K

This is apparently a bug

Bug 10211065.-P Base Bug 9796810

Abstract: MEMORY FOOTPRINT FOR DEDICATED SERVER PROCESSES MORE THAN DOUBLED AFTER 11G UGP

Bug 9796810.-P Base Bug 10190759

Abstract: 11G SERVER PROCESSES CONSUMING MUCH MORE MEMORY THAT 10G OR 9I

Bug 10190759.-P

Abstract: PROCESSES CONSUMING ADDITIONAL MEMORY DUE TO 'USLA HEAP'

The good news is - there's a 'interim' patch - number 10190759.

It basically changes the make file so that it excludes certain options (-bexpfull and -brtllib) related to 11g's online patching feature.

It's not really an Oracle problem but it seems related to a bug in runtime loader on AIX.

Technorati Tags: 11g AIX memory

11.2.0.2

Submitted by d (not verified) on Tue, 03/22/2011 - 22:48.

Hi, is this fixed in 11.2.0.2 ?

Thx.

Patch exists for 11.2.0.2

Submitted by Friedrich Pfeiffer (not verified) on Mon, 03/28/2011 - 14:47.

Hi d,

there exists a patch (#10190759) for 11.2.0.2 so it's not fixed in the base release.

regards

Friedrich

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