ORA-01102: cannot mount database in EXCLUSIVE mode

ORA-01102: cannot mount database in EXCLUSIVE mode

Solution :- Check if pmon (Background Process) is already running

$ ps -ef|grep pmon
Kill the running pmon processes

$kill -9 {pid}    #pid is process id of pmon process
Now connect and start the Oracle

$sqlplus sys as sysdba

SQL>startup

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