1Z0-053 V13.02 Q69

69.The EMP table exists in your schema. You want to execute the following query:
SELECT ename, sal
FROM emp AS OF TIMESTAMP (SYSTIMESTAMP - INTERVAL '6' MINUTE)
WHERE ename = 'ALLEN';
What are the minimum requirements for the statement to execute successfully? (Choose all that apply)
A.ARCHIVELOG mode must be enabled
B.Row Movement must be enabled for the table
C.FLASHBACK must be set to ON for the database
D.The UNDO_MANAGEMENT parameter must be set to AUTO
E.The UNDO_RETENTION parameter must be set appropriately
Answer: DE

此题是考查闪回查询，闪回查询是基于UNDO数据的。

来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/81227/viewspace-2120898/，如需转载，请注明出处，否则将追究法律责任。

转载于:http://blog.itpub.net/81227/viewspace-2120898/