单项选择题

You are working on a very large database. You had performed a binary backup of the control file a month ago. After this you added a few tablespaces， and dropped a couple of tablespaces. This morning， due to hardware failure， you lost all your control files.
How would you recover the database from this situation？（）

A.A
B.B
C.C
D.D
E.E

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单项选择题

In the instance of the PROD database， the checkpoint （CKPT） process runs after every minute. A database user updates the rows of the ORDERS table. Because of the configuration， the CKPT process gets initiated before the user commits the transaction. What would happen to the modified blocks when the CKPT process is started？（）

A.The modified blocks would be written to the data files.
B.The modified blocks would be written to the temp files.
C.The modified blocks would be written to the control file.
D.The modified blocks would be written to the redo log files.
E.The modified blocks would be written to the archived redo log files.
F.The modified blocks would be retained in the database buffer cache.

单项选择题

Users in your PROD database complain about the slow response of the transactions. While investigating the reason， you find that the transactions are waiting for the undo segments to be available， and undo retention has been set to zero. What would you do to overcome this problem？（）

A.increase the undo retention
B.create more undo segments
C.create another undo tablespace
D.increase the size of the undo tablespace

单项选择题

The customer and order tables are often used in joins， thereby resulting in complex queries. You created views to simplify the writing of queries. These views are stored in（）.

A.user tables
B.view segment
C.table segment
D.data dictionary
E.object segment
F.performance tables