Answer / lance

shutdown database first;
startup mount exclusive;
then issue ALTER DATABASE FLASHBACK OFF

Answer / guest

Cause: An attempt was made to set DB_RECOVERY_FILE_DEST to
null while flashback database was enabled. Flashback
database requires DB_RECOVERY_FILE_DEST to be set.

Action: Use the ALTER DATABASE FLASHBACK OFF statement to
disable flashback database, then disable the flash recovery
area.

Please add more information about this Error

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