> The problem with using a real file is that the filesystem is going to be
> flushing those dirty pages to disk, and that could really hurt
> performance.
definitely
> Actually, when I install Informix, I always have to modify the kernel to
> allow a larger amount of SYSV shared memory. Maybe we just need to give
> people per-OS instructions on how to do that. Under BSD/OS, I now have
> 32MB of shared memory, or 3900 8k shared buffers.
This I think would be the best solution. There are actually not that many systems
with too low limits.
AIX: per segment 256Mb max 10 segments per process (AIX 4.3 any number of segments)
Andreas