You have 100 segments in the USERS tablespace. You get an alert that the USERS tablespace is running low on space. You decide to shrink some segments. Which option would you use to determine which segments to shrink?（）

单项选择题YouexecutedthefollowingSQLstatementtoshrinktheEMPLOYEEStablesegmentstoredintheEXAMPLEtablespace:ALTERTABLEemployeesSHRINKSPACECASCADE;Whichstatementiscorrectinthisscenario?（）

A.The data in the segment will be compacted but the high water mark will not be adjusted 
B.The EMPLOYEES table will be changed to read-only mode during the shrink operation 
C.The indexes created on the EMPLOYEES table will need to be rebuilt after the shrink operation is over
D.The shrink behavior will be cascaded to all dependent segments of the table that support a shrink operation 
E.Data manipulation language (DML) operations will not be possible on the EMPLOYEES table during the COMPACTION phase of the shrink operation

单项选择题Anonlinetablespace,TEST_TBS,isfullandyourealizethatnoserver-managedtablespacethresholdalertsweregeneratedfortheTEST_TBStablespace.Whatcouldbethereason,iftheTEST_TBStablespacedoesnotincludeautoextensibledatafiles?（）

A.TEST_TBS is a small file tablespace 
B.TEST_TBS is a bigfile tablespace (BFT)
C.TEST_TBS is the default temporary tablespace
D.TEST_TBS is a dictionary-managed tablespace
E.Threshold values for the TEST_TBS tablespace are not explicitly specified

单项选择题Youexplicitlyspecifiedthetablespaceusagethresholdvalueswhilecreatingatablespace.Youneedtoreverttothedatabase-widedefaulttablespaceusagethresholdvaluesforthe tablespace.WhichPL SQLpackagewouldyouuse?（）

A.DBMS_STATS 
B.DBMS_ALERT 
C.DBMS_SPACE 
D.DBMS_MONITOR 
E.DBMS_SERVER_ALERT
F.DBMS_SPACE_ADMIN

多项选择题Youneedtoensurethatthedatabaseusersshouldbeabletousethevariousflashbackqueryfeaturesinordertogobackintimebyfourhours.Whatwouldyoudotoachievethis?（）

A.set SQL_TRACE=True 
B.set UNDO_RETENTION=14400 
C.set FAST_START_MTTR_TARGET=240 
D.set LOG_CHECKPOINT_INTERVAL=240 
E.set DB_FLASHBACK_RETENTION_TARGET=14400 
F.set the RETENTION GUARANTEE clause for the undo tablespace

多项选择题WhichtwostatementsregardingthePolicyFrameworkinEnterpriseManager(EM)arecorrect?（）

A.Policy violations are prioritized as High, Medium, or Informational by category 
B.Policies can be disabled completely, or flagged as ignored, for the specified target 
C.Policies can be flagged as ignored, but never completely disabled, for the specified target
D.Policy violations must be corrected, otherwise the database will shut down until corrective action occurs