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Oracle® Database 11g / 12c / 18c error codes ORA-01530: a database already mounted by the instance
ORA-01530: a database already mounted by the instance
Oracle Error Code: ORA-01530
Cause: During ALTER DATABASE MOUNT, an attempt is being made to mount a database on an instance in which a database is or has previously been mounted.
Action: If you wish to mount the database, shutdown the instance and then startup the instance and retry the operation.