单项选择题
A. Flash back all the tables in the data file， one by one.
B. Restore the data file to a new location and perform a media recovery.
C. Flash back the database， there is no need to restore the data file.
D. Restore the data file from the most recent backup and flash the database.
单项选择题 Exhibit： View the Exhibit and examine the characteristic 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 FortheV$SESSION_LONGOPSview，youfindthatsomeofthedatabaseusershavelong-runningqueriesthatconsumealotofCPUtime.Thiscausesperformanceproblemsforotherusersinthedatabase，whohavemuchshorterqueries.YouwouldliketomakesurethattheuserswithlargequeriesdonotusealltheCPUtime，butyoustilldonotwanttoterminatethemwithanerrormessage.Whichmethodwouldyoufollowtoachievethis？（）
单项选择题 Youlosttheindextablespaceinyourdatabase.Youarenotabletousetablespacepoint-in-timerecoveryontheindextablespace.Whatcouldbethereasonforthis？（）