SQL*Plus: Release 11.2.0.1.0 Production on Thu Sep 3 11:07:01 2020
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Connected to an idle instance
SQL> startup
ORA-00845: MEMORY_TARGET not supported on this system
Solution:
Connect as root user and execute below command:
-bash-4.1$ sudo su -
[root@oracleserverdb11g ~]# mount -t tmpfs shmfs -o size=7g /dev/shm
[root@oracleserverdb11g ~]#