Answer / guest

Cause: A command was attempted that requires the database to
be mounted.

Action: If you are using the ALTER DATABASE statement via
the SQLDBA startup command, specify the MOUNT option to
startup; else if you are directly doing an ALTER DATABASE
DISMOUNT, do nothing; else specify the MOUNT option to ALTER
DATABASE. If you are doing a backup or copy, you must first
mount the desired database. If you are doing a FLASHBACK
DATABASE, you must first mount the desired database.

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