You attempt to startup an instance of your newly created Oracle
Parallel Server database but encounter the following error:
ORA-01102, “cannot mount database in EXCLUSIVE mode”
Solution Description
Set PARALLEL_SERVER = TRUE in your init.ora file
Explanation
Without setting parallel_server = true in the init.or file before startup,
a startup command will not start the database as an OPS instance. Instead,
the startup will be attempted exclusive. This leads to errors like ora-1102.
By setting parallel_server = true, a “startup” command will attempt a
parallel startup.