Can I increase the SHMMAX (Shared Memory Max) value from 16GB to 64GB?
Posted on 2009-02-19
I wants to increase the value of SHMMAX from 16GB to 64GB as Oracle expert recommended. The expert recommended to increase it from existing 16GB to 64GB. Is there any side effect to the system? Can Solaris 8 accept?
The server has 160GB of memory. And SHMMAX=Max Shared Memory Segment. If I use the recommendation from Oracle expert which is 64GB, 2 segments will use 128GB of memory. Is it possible to grab 128GB of memory on the fly. Since the server has 160GB of memory, he can at most grab 2 segments, provided there is enough memory.
----- Current value ----
* IPC Shared Memory
8589934592 max shared memory segment size (SHMMAX)
512 shared memory identifiers (SHMMNI)
Thanks in advance,