Tuesday, 22 November 2011

FLASHBACK command


Undo the DROP command using FLASHBACK command
 
Example:

CREATE TABLE xx_drop_test (ID NUMBER,attribute1 VARCHAR2(10))


SELECT *
  FROM xx_drop_test

SELECT *
  FROM all_objects
 WHERE object_name = 'XX_DROP_TEST' AND object_type = 'TABLE'
-- 1 row returned

DROP TABLE xx_drop_test

COMMIT;

SELECT *
  FROM xx_drop_test
--Table or view does not exists 

SELECT *
  FROM all_objects
 WHERE object_name = 'XX_DROP_TEST' AND object_type = 'TABLE'
-- No rows returned



-- To view all dropped tables
SELECT *
  FROM user_recyclebin                          
 WHERE original_name = 'XX_DROP_TEST' AND TYPE = 'TABLE'



--FLASHBACK TABLE <TABLE_NAME> TO BEFORE DROP
FLASHBACK TABLE xx_drop_test TO BEFORE DROP 



--FLASHBACK TABLE <TABLE_NAME> TO BEFORE DROP RENAME TO <NEW_TABLE_NAME>
FLASHBACK TABLE xx_drop_test TO BEFORE DROP RENAME TO xx_drop_test
-- Ignore the message: ORA-27231: Message 27231 not found;  product=RDBMS; facility=ORA


-- To delete table permanantly, we cann't flashback it. We can't find in user_recyclebin
--DROP TABLE <TABLE_NAME> PURGE 
DROP TABLE xx_drop_test PURGE

Thanks,
Rajesh

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