单项选择题 View the Exhibit and examine the characteristics of the USERS tablespace.  You observe that a large volume of inserts and deletes are happening on the TRANS table in the USERS tablespace and you suspect that the TRANS table is fragmented.  Which advisory component would you refer to， in order to find information about table fragmentation？（）

单项选择题 You observe that database performance has degraded over a period of time. While investigating the reason， you find that the size of the database buffer cache is not large enough to cache all the needed data blocks.  Which advisory component would you refer to， in order to determine the required size of the database buffer cache？（）

多项选择题 WhatarethetwoadvantagesofRMANBlockMediaRecovery（BMR）overfile­levelrecovery？（）