01-19-2015
I think you should look at shared memory as well. That uses paging as a backing store.
If you allocate a shared memory block for a database instance, it allocates swap as well as memory. So the amount of swap used by the db limits the virtual memory other process can acquire, or show as swap being used up by otherwise normal operations.
Since this is AIX I do not know the command analogous to ipcs found every where else.
You need to see what percent of memory is used as shared memory segments.
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MEM(4) Kernel Interfaces Manual MEM(4)
NAME
mem, kmem - main memory
SYNOPSIS
major device number(s):
raw: 1
minor device encoding:
mem: 0; kmem: 1; null: 2
DESCRIPTION
Mem is a special file that is an image of the main memory of the computer. It may be used, for example, to examine (and even to patch) the
system.
Byte addresses in mem are interpreted as physical memory addresses. References to non-existent locations cause errors to be returned.
The file kmem is the same as mem except that kernel virtual memory rather than physical memory is accessed. Only kernel virtual addresses
that are mapped to memory are allowed. Examining and patching device registers is likely to lead to unexpected results when read-only or
write-only bits are present.
On PDP-11s, the I/O page begins at location 0160000 of kmem and the per-process data segment for the current process begins at 0140000 and
is USIZE clicks (64 bytes each) long.
FILES
/dev/mem
/dev/kmem
/dev/MAKEDEV script to create special files
/dev/MAKEDEV.local script to localize special files
BUGS
On PDP-11's, specifying an odd kernel or user address, or an odd transfer count is [generally] slower than using all even parameters.
On machines with ENABLE/34(tm) memory mapping boards the I/O page can be accessed only through kmem.
3rd Berkeley Distribution January 28, 1988 MEM(4)