ORA-00845 When starting Up an 11g Instance with AMM

This note apply to Oracle Database 11g and linux S.O.


On a Linux system, trying to start up an 11g instance could fail with the following error:
ORA-845: MEMORY_TARGET not supported on this system

In the alert log, you could or could not see the below messages:
ORA-04031 errors.


The problem occur when use AMM (Automatic Memory Management) and the initialization parameter MEMORY_TARGET or MEMORY_MAX_TARGET, is greater than the shared memory filesystem (/dev/shm) on your operating system.



Mount filesystem (/dev/shm) :
mount -t tmpfs shmfs -o size=16g /dev/shm

Add in (/etc/fstab) :
tmpfs   /dev/shm  tmpfs  defaults   0 0

See the filesystem :
df -h
tmpfs  16G   13G  2.9G  82% /dev/shm



Good Luck !





1 Comment to "ORA-00845 When starting Up an 11g Instance with AMM"

  1. 10/02/2011 - 2:08 AM | Permalink

    Thanks for the share!

Leave a Reply