單項(xiàng)選擇題

You are working as a DBA on the decision support system. There is a business requirement to track and store all transactions for at least three years for a few tables in the database. Automatic undo management is enabled in the database.
Which configuration should you use to accomplish this task？（）

A. Enable Flashback Data Archive for the tables.
B. Specify undo retention guarantee for the database.
C. Enable supplemental logging for the database.
D. Query V$UNDOSTAT to determine the amount of undo that will be generated and create an undo tablespace for that size.
E. Create Flashback Data Archive on the tablespace on which the tables are stored.

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多項(xiàng)選擇題

Which statements are true regarding table compression？（）

A. It saves disk space and reduces memory usage.
B. It saves disk space but has no effect on memory usage.
C. It incurs extra CPU overhead during DML as well as direct loading operations.
D. It incurs extra CPU overhead during DML but not direct loading operations.
E. It requires uncompress operation during I/O.

多項(xiàng)選擇題

You are managing an Oracle Database 11g ASM instance having three disks in a disk group with ASM compatibility attribute set to 11.1.0 and redundancy set to high. One of the disks in the disk group becomes unavailable because of power failure.
Which statements will be true in this scenario？（）

A. The disk is immediately dropped from the disk group.
B. The ASM tracks the extents that are modified during the outa
C. The ASM migrates the extents from the unavailable disk to the remaining disks.
D. The disk automatically goes offline.

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Which statements are true regarding table compression？（）

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Which statements are true regarding table compression？（）