Oracle 7 EBU and Shared Memory Issues

[Brian Kaeb]

Using HP-UX 10.20 and Oracle 7.4.4, there are four instances running;SEGSZ's
are 689MB, 285MB, 460MB and 4.6MB
The databases are backups a different times and days, so the instances are
being shutdown and startedup separately.
Using Legato 5.5, the Oracle obackup scripts are used to initiate the backups.
There is a script that shutsdown the instance piror to the EBU obackup scripts
and then after the EBU is successful, there is a script that brings the
database backup.
We are still in a testing phase and 285MB instance works fine but the larger
instance of 689MB always fails with a shmget error; unable to get a shared
memeory segment. Any thoughts?

[James Kirkland_2]

Hi,

At 10.20 you can have a total of 1.75GB of shared memory. The largest segment
size is 1GB. When you try to shmget() the larger segment it takes you over
1.75GB in shared memory. There is a way to increase this limit to 2.75GB using
shared memory magic(shmem_magic). Please see document id rcfaxmemory001 in the
ITRC knowledge database.

Jim