SOLVED: ORA-00845: MEMORY_TARGET not supported on this system

This message is shown when the shmfs file system is undersized and cannot accommodate the

MEMORY_TARGET and MEMORY_MAX_TARGET values

The following command  mounts/remounts the shmfs file system with a new value of 12 Gb

[root@oracle-em oracle]# mount -t tmpfs shmfs -o size=12g /dev/shm

The above command changes the size but it does not persist after reboots.

 

To make the change persistent, edit your /etc/fstab file to include the option you specified above:

[root@oracle-em ~]# vi /etc/fstab

and alter the size value 

tmpfs /dev/shm tmpfs size=12g 0 0