RE: About AIX configuration for Oracle

  • From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
  • To: "gil.cota@xxxxxxxxxx" <gil.cota@xxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 19 Oct 2009 16:01:18 -0700

Do a google search for something like "aix oracle tuning" and you'll get some 
good white papers from IBM.  In summary:

Use large pages
Lock/Pin the SGA
Adjust memory parms you've already mentioned  (I set mine to minperm%=5, 
maxperm%=15 & maxclient%=15, but not sure if that will be optimal for you)
Set lru_file_repage=0
Set aixthread_scope=S
Put redologs on separate filesystem with agblksize=512 (or use ASM)
Use Concurrent I/O (or use ASM)

Metalink 316533.1 and its references have lots more detail too.  As for why AIX 
does such aggressive swapping out of the box w/o adjusting these parameters, 
I'm not sure on the details, but it's a known problem so you might want to just 
implement the known solution and move on.  It's worked well for me in my AIX 
environment with Oracle for 3 years now.  I used to have a better 
understanding of the details behind the problem back when I first researched it 
3 years ago - but it's faded a bit now.


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