ORA-38776: cannot begin flashback generation - flash recovery area is disabled
Cause: During a database mount, the RVWR process discovered that the flash recovery area was disabled. DB_RECOVERY_FILE_DEST must have been set null or removed from the INIT.ORA file while the database was unmounted.
Action: Flashback database requires the flash recovery area to be enabled. Either enable the flash recovery area by setting the DB_RECOVERY_FILE_DEST and DB_RECOVERY_FILE_DEST_SIZE initialization parameters, or turn off flashback database with the ALTER DATABASE FLASHBACK OFF command.