Re: ORA-27123: unable to attached to shared memory segment

From: Yong Huang <yong321_at_yahoo.com>
Date: 22 Jul 2002 15:27:43 -0700
Message-ID: <b3cb12d6.0207221427.6c9d2dbe@posting.google.com>

otis_usenet_at_yahoo.com (OtisUsenet) wrote in message news:<5606b639.0207151335.3bdcdecb_at_posting.google.com>...
> This Linux machine has 1 GB RAM.
> Shared memory from /proc/sys/kernel/shm*:
> $ cat /proc/sys/kernel/shm*
> 2097152
> 33554432 <-- shmmax
> 4096

...
>
> Here are some more current kernel numbers:
>
> $ ipcs -l
>
> ------ Shared Memory Limits --------
> max number of segments = 4096
> max seg size (kbytes) = 32768
> max total shared memory (kbytes) = 8388608
> min seg size (bytes) = 1

Not sure if it's true for Linux, but in Solaris the setting shmsys:shminfo_shmmax does not really use resources. It's a ceiling that is useful maybe in cases where you want to limit some users in creating rogue applications. You can set it to the theoretical limit, 4 billion on 32-bit OS.

Yong Huang Received on Mon Jul 22 2002 - 17:27:43 CDT