In Recovery Manager （RMAN）， you have set control file autobackup to ON by using the following command： 
CONFIGURE CONTROLFILE AUTOBACKUP ON; 
Which two events would cause the control file to be backed up automatically？ （）

单项选择题You set the recovery window to seven days and the backup optimization to ON using the CONFIGURE command of Recovery Manager （RMAN）. The most recent backup of the TOOLS tablespace to disk was taken on January 3. The TOOLS tablespace is read­only.  On February 21， when you execute a command to back up all the tablespaces to disk， you find that RMAN backs up the TOOLS tablespace also， even though the contents of the tablespace have not changed after the backup on January 3.  Because there are no changes made to the TOOLS tablespace， you decide that the tablespace should not be backed up by RMAN. What can you to do skip backing up the TOOLS tablespace without changing the current backup optimization setting？（）

A.configure a default device for RMAN backups
B.temporarily disable the retention policy for RMAN backups
C.configure automatic channel allocation for RMAN backups
D.use the CONFIGURE command to reconfigure the recovery window to 60 days

单项选择题You defined the Recovery Manager （RMAN） retention policy to recovery window of 7 days by executing the following command：  RMAN> CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS  When a backup is performed， what would be the status of this backup after seven days？（）

A.The backup would be marked as invalid.
B.The backup would be marked as obsolete.
C.The backup would be removed from the media.
D.The backup would be removed from the RMAN repository.

单项选择题An RMAN backup job fails， displaying the following error message：  ORA­19809： limit exceeded for recovery files  Your analysis shows that the Flash Recovery area is full. What would you do to resolve the error？（）

A.increase the value of UNDO_RETENTION
B.change the value of WORKAREA_SIZE_POLICY to AUTO
C.increase the value of DB_RECOVERY_FILE_DEST_SIZE
D.increase the value of CONTROL_FILE_RECORD_KEEP_TIME

多项选择题An RMAN backup job fails， displaying the following error：  ORA­19809： limit exceeded for recovery files  Your analysis shows that the Flash Recovery area is full. Which two actions could you take to resolve the error and avoid this error in future？（）

A.take the backup of the flash recovery area less frequently
B.increase the value of the UNDO_RETENTION initialization parameter
C.change the value of the WORKAREA_SIZE_POLICY initialization parameter to AUTO
D.change the backup retention policy to retain the backups for a smaller period of time 
E.increase the value of the DB_RECOVERY_FILE_DEST_SIZE initialization parameter
F.increase the value of the CONTROL_FILE_RECORD_KEEP_TIME initialization parameter

单项选择题Youwererecentlyhiredbyanorganizationasadatabaseadministrator.Youareaskedtofindoutwhetherthecurrentlyfunctionallistenerprocess，namedL1，hasbeenpasswordprotectedornot.Youarenotfamiliarwiththefilesystemoftheneworganization.Howwouldyouaccomplishthetask？（）

A.by using the STATUS command of the Listener control utility
B.by using the STATUS L1 command of the Listener control utility
C.by using the SHOW RULES command of the Listener control utility
D.by using the SET PASSWORD command of the Listener control utility
E.by searching for the PASSWORD_LISTENER entry in the listener.ora file