You have specified the warning and critical threshold values of an application tablespace to be 60% and 70%， respectively. From the tablespace space usage metrics， you find that the actual space usage has reached the specified warning threshold value， but no alerts have been generated. 
What could be the reason for this？（） 

单项选择题InanOracle10gdatabase，thein-memorystatisticsaregatheredatregularintervalsandusedtoperformgrowth-trendanalysisandcapacityplanningofthedatabase.Whichcomponentstoresthesestatistics？（）

A.recovery catalog
B.Oracle Enterprise Manager Repository
C.Automatic Workload Repository （AWR）
D.Oracle 10g Enterprise Manager Grid Control
E.Automatic Database Diagnostic Monitor （ADDM）

单项选择题Thewarningandcriticalthresholdvalueshavebeensetto85%and97%，respectively，foroneofthetablespaces.Thecurrenttablespacespaceusageis54%.Youmodifythewarningthresholdtobe50%andcriticalthresholdtobe53%inDatabaseControl.Whichstatementistrue？（）

A.The new setting would be applied but no alerts would be raised immediately.
B.The new setting would be applied and an alert would be raised immediately.
C.The new setting would be ignored because the tablespace space usage is more than the specified threshold value.
D.The new setting would cause an error because the tablespace space usage is more than the specified threshold value.

多项选择题Intheparameterfileofyourproductiondatabase，theFAST_START_MTTR_TARGETparameteris setto300tooptimizeinstancerecovery.Whileobservingtheperformanceofthedatabaseduringinstancerecovery，youfindthattheredologfilesarenotsizedproperlytosupportthisactivity.Whichtwosourcescouldyouusetodeterminetheoptimalsizeoftheredologfiles？（）

A.the V$LOG view
B.the V$DBFILE view
C.the V$LOGFILE view
D.the V$INSTANCE_RECOVERY view
E.Oracle Enterprise Manager Database Control

多项选择题YourproductiondatabaseisrunningintheARCHIVELOGmodeandtheARCnprocessisfunctional.Youhavetwoonlineredologgroups.Whichthreebackgroundprocesseswouldbeinvolvedwhenalogswitchhappens？（）

A.archival
B.log writer
C.database writer
D.system monitor
E.process monitor
F.change tracking writer

多项选择题In your production database， you have observed that the database server performance degrades whenever there is a switch between the log groups. On further investigation， you find that the database is running in ARCHIVELOG mode and the archived log files are being written to the same disk that is used to store the redo log members.  Which two actions would you take to improve the performance of the database server？ （）

A.increase the size of the redo log buffer
B.increase the number of redo log groups
C.increase the number of log writer processes
D.increase the number of ARCn processes
E.change the appropriate LOG_ARCHIVE_DEST_n parameter to place the archived log files in a separate location