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
单项选择题 Todeterminethespaceallocatedfortemporarysegments,theDBAcanaccesswhichofthefollowingviews?（）
单项选择题 Bydefault,checkpointshappenatleastasoftenas（）.
单项选择题 Whichofthefollowingchoicesidentifiesadatabasecomponentthatwillbeusedfor multiplexingcontrolfiles?（）
