11gR2/Aix - Dedicated Server Processes Have Large Usla Heap Segment Compared To Older Versions
(Doc ID 1260095.1)
Last updated on FEBRUARY 03, 2019
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 to 22.214.171.124 [Release 11.2]
IBM AIX on POWER Systems (64-bit)
Dedicated server processes using significantly more memory on 11gR2 compared to previous versions (9i, 10g, 11g).
Using svmon to monitor process memory segment after initial DB connection, You can observe that typical USLA heap size jumped from ~0.4M in 10g to 7.0M in 11gR2.
svmon -P PID - where PID is an Oracle process id
Oracle Release -> (work USLA heap times 4k pages size)
126.96.36.199.0 -> 7M bytes
188.8.131.52.0 -> 60KB
10.2.0.4.0 -> 420KB
Slow system performance for larger footprint of all oracle server process. If physical memory is fully used, the could terminate an Oracle instance via terminating a PMON process.
Upgraded to 11gR2
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