单项选择题

You are trying to determine how many disk sorts are happening on the database right now. Which of the following dictionary tables would you use to find that information?（）

A.V$SESSION
B.V$SYSSTAT
C.DBA_SEGMENTS
D.V$SORT_USAGE

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单项选择题

Todeterminethespaceallocatedfortemporarysegments,theDBAcanaccesswhichofthefollowingviews?（）

A.DBA_TABLESPACES
B.DBA_TABLES
C.DBA_SEGMENTS
D.DBA_FREE_SPACE

单项选择题

Bydefault,checkpointshappenatleastasoftenas（）.

A.Redo log switches.
B.UPDATE statements are issued against the database.
C.The SYSTEM tablespace is accessed.
D.SMON coalesces free space in a tablespase.