Oracle RAC Startup failed ORA-01102: cannot mount database in EXCLUSIVE mode

Problem Description
Oracle RAC database startup command failed with ORA-01102: cannot mount database in EXCLUSIVE mode.
Error Description:
The error is because the database is running or opened in EXCLUSIVE mode in one node. So you can not start the database in another node with normal startup command.
Either you have to shutdown the instance in another node and try startup command or better use srvctl command to start and start the database.

srvctl stop database –d prod

srvctl start database –d prod
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