多项选择题
In the parameter file of your production database， the FAST_START_MTTR_TARGET parameter is set to 300 to optimize instance recovery. While observing the performance of the database during instance recovery， you find that the redo log files are not sized properly to support this activity. Which two sources could you use to determine the optimal size of the redo log files？（）
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
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YourproductiondatabaseisrunningintheARCHIVELOGmodeandtheARCnprocessisfunctional.Youhavetwoonlineredologgroups.Whichthreebackgroundprocesseswouldbeinvolvedwhenalogswitchhappens？（）
A.archival
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D.system monitor
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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
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E.change the appropriate LOG_ARCHIVE_DEST_n parameter to place the archived log files in a separate location -
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