FlashBack Example

Enabling FlashBack

Startup mount / startup mount exclusive

alter system set db_recovery_file_dest = ‘path’;

alter system set db_recovery_file_dest_size = 4g; -- (Default 2G)

alter database archivelog; -- (If DB is not in archive mode)

alter database flashback on;

select flashback_on from V$database;

alter system set db_flashback_retention_target=2840 -- (in minutes)

alter system set recyclebin=on;

alter database open;

conn scott/tiger

create table orasoft (id number(5));

alter table orasoft enable row movement; -- (to rewind the table we use row movement)

select current_scn from V$database; -- (from sys user)

insert into orasoft values(1);

commit;

select current_scn from V$database; -- (from other session (sys user))

flashback table orasoft to scn 123456; -- (number obtain from v$database.current_scn)

select count(*) from orasoft;

delete orasoft; -- (note the sysdate)

select count(*) from orasoft; -- (will return 0 rows)

Flashback table orasoft to timestamp to_stamp(‘2009-09-03 09-55-00’, ‘RRRR-MM-DD

HH24-MI-SS’);

SELECT COUNT(*) FROM ORASOFT;

To recover a Dropped Table

DROP TABLE ORASOFT;

FLASHBACK TABLE ORASOFT TO BEFORE DROP;

SELECT*FROM ORASOFT;

To recover & rename a Dropped Table

DROP TABLE ORASOFT;

FLASHBACK TABLE ORASOFT TO BEFORE DROP rename to new_name;

SELECT*FROM new_name;