View the Exhibit and examine the recommendation graph provided for a test database by the Undo Advisor.The graph recommends that the size of undo tablespace should be set to（）.

单项选择题Thesystemwasrunninganormalworkloadduringthelast24hours.Youneedtoensurethatwiththesameworkloadyoushouldbeabletoflashbacktablesbythreehours.Whatwouldyoudotofindthesystemrecommendationsfortheundoretentionperiodandtheundotablespacesize?（）

A.set DB_FLASHBACK_RETENTION_TARGET=10800  
B.create a new scheduler window for the time period of 24 hours and use the optimizer statistics 
C.modify the Automatic Workload Repository (AWR) snapshot time interval to three hours and use ADDMfindings 
D.specify New Undo Retention as three hours and Analysis Time period as Last One Day in the Undo Advisor page and use its recommendations

多项选择题WhicharethethreelevelsatwhichtheSegmentAdvisorgeneratesadvice?（）

A.block level 
B.object level 
C.schema level 
D.segment level 
E.tablespace level

单项选择题Youhave100segmentsintheUSERStablespace.YourealizethattheUSERStablespaceisrunninglowonspace.YoucanuseSegmentAdvisorto（）.

A.add data files to the tablespace 
B.identify the segments that you should shrink 
C.modify the storage parameters for the tablespace 
D.automatically shrink the segments with unused space 
E.check the alerts generated for the tablespace that is running low on space

单项选择题Youhave100segmentsintheUSERStablespace.YougetanalertthattheUSERStablespaceisrunninglowonspace.Youdecidetoshrinksomesegments.Whichoptionwouldyouusetodeterminewhichsegmentstoshrink?（）

A.Segment Advisor 
B.SQL Tuning Advisor 
C.SQL Access Advisor 
D.Segment Resource Estimation 
E.Automatic Database Diagnostic Monitor (ADDM)

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