Oracle : Ошибка ORA-38726


"Flashback database logging is not on."
*Cause: A FLASHBACK DATABASE command was tried but flashback database
logging has not been enabled.
*Action: Flashback database logging must be enabled via the ALTER
DATABASE FLASHBACK ON command before a FLASHBACK DATABASE command
can be tried. If the database must be taken back in time then
a restore and incomplete recovery must be performed.

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