Recently, when I tried to increase the memory_target of Oracle database, I got the following error:
ORA-00845: MEMORY_TARGET not supported on this system
While checking, we found that /dev/shm size was 2 GB, but we were trying to increase the memory_target values to 7 GB that is more than the size of /dev/shm. So we got the error.
Then we increased the /dev/shm size to 8 GB using the command as below
mount -t tmpfs shmfs -o size=8192m /dev/shm
After that, we were able to bring up the database with the parameter value memory_target =7G without the issue.
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