G'day. At my current's client site I'm confronted with db2 v8.2.5 32 bit on aix v5.3 64 bit with enough RAM.
I want to increase the various buffer pool sizes as much as possible. My first attempt failed because I assumed (shame on me) that I could configure 3,2Gb of storage.... WRONG! Hello hidden buffer-pools
Then google told me that on aix i can only configure 1,75 Gb. Yep, that's all folks.

What google could not find for me is what do I have to squeeze in that 1,75Gb? Does that include buffer-pools, lock-list, package-cache etc etc.
And what about util_heap-sz, should I reserve space for that memory-object as well?
Frustrating cofiguration: all that RAM unused in the O.S. and disappointing bufferpool hit-rates and nothing you can do about it.

see if this tech article helps you out :
The DB2 UDB memory model

Okay, but I'm on 64 bit AIX with 32 bit DB2. Do the same rules apply?
If so, it leaves me emptyhanded. Not much I can do.

double post, sorry

In v8.2, you could allocate up to 2GB of db shared memory. With 64-bit AIX, 32-bit instance is limited to 32-bit limitations until the instance is converted to 64-bit.