SQL> alter database flashback on;
alter database flashback on
*
ERROR at line 1:
ORA-38706: Cannot turn on FLASHBACK DATABASE logging.
ORA-38709: Recovery Area is not enabled.

SQL> alter system set db_recovery_file_dest_size=2G;

System altered.

SQL> alter system set db_recovery_file_dest='/oradata/flashback';

System altered.

SQL> alter database flashback on;

Database altered.

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Linux,oracle