单选题Consider this RMAN command：   RMAN> CONFIGURE RETENTION POLICY CLEAR；   What is the effect of this command？（）A Backups will never expire.B It removes any retention policy.C The DELETE OBSOLETE command will fail with an error.D It sets the retention pol

第1题：

The backup retention policy is configured as RECOVERY WINDOW 2. You executed the following command in Recovery Manager （RMAN） against your database： RMAN> REPORT OBSOLETE； What would you see in the output？（）

• A、 a list of all those files that have been deleted in the last two days
• B、 a list of all those files that have been recovered within the last two days
• C、 a list of all the expired backups and copies
• D、 a list of backups and copies that are outside the range covered by the current retention policy

第2题：

Why would you run the delete obsolete command？（）  

• A、 To remove missing backup set pieces physically from disk
• B、 To remove metadata related to backup set pieces in the control file and the recovery catalog
• C、 To mark as deleted records in the control file and the recovery catalog associated with obsolete backup sets
• D、 To delete backup set pieces associated with backups that are no longer needed due to retention criteria
• E、 To remove old versions of RMAN backups

第3题：

You issue the following RMAN command to set a retention policy on a database：       RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY 2；   What will be the outcome of the above command？（）

• A、 After two days， the backup will be marked obsolete.
• B、 After two days， the backup will be deleted from the media.
• C、 If the RMAN repository has records of two or more recent backups of a file， then the older backup will be deleted from the media.
• D、 If the RMAN repository has records of two or more recent backups of a file， then the older backup will be marked obsolete.

第4题：

You configured the default backup device type as disk for RMAN backups. In your database，because of business requirements，you have to take a simultaneous duplicate backup of the data files when the RMAN BACKUP command is used.  What must you set using the RMAN CONFIGURE command to achieve this？（）  

• A、 MAXSETSIZE TO 2
• B、 DEVICE TYPE DISK PARALLELISM 2
• C、 RETENTION POLICY TO REDUNDANCY 2
• D、 DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2

第5题：

Consider this RMAN command：   RMAN> CONFIGURE RETENTION POLICY CLEAR；   What is the effect of this command？（）

• A、Backups will never expire.
• B、It removes any retention policy.
• C、The DELETE OBSOLETE command will fail with an error.
• D、It sets the retention policy to the default of REDUNDANCY 1.

第6题：

You performed the RMAN database backup having a backupset key number 231 with the KEEP FOREVER option.  After some days， you want to change the status of the database backup and you issued the following command：   RMAN>CHANGE BACKUPSET 231 NOKEEP；   What is the implication of this command？（）

• A、 The backup is deleted.
• B、 The backup is marked unavailable.
• C、 The backup overrides the backup retention policy.
• D、 the backup becomes eligible for deletion according to the existing retention policy.

第7题：

第8题：

第9题：

第10题：

第11题：

第12题：

第13题：

You have enabled backup optimization in RMAN. You issue the following RMAN command to configure a redundancy-based retention policy: CONFIGURE RETENTION POLICY TO REDUNDANCY 3; Which statement is true?（）

• A、The command fails because you cannot configure a redundancy-based retention policy when backup optimization is enabled
• B、Backup optimization is performed, but RMAN considers the redundancy-based retention policy when it determines which datafiles should be backed up
• C、Backup optimization is permanently disabled
• D、Backup optimization is temporarily disabled because a redundancy-based retention policy is specified

第14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.

第15题：

Examine the following RMAN command：   BACKUP DATABASE TAG TESTDB  KEEP UNTIL ’SYSDATE+1’ RESTORE POINT TESTDB06；   Which two statements are true regarding the backup taken by using the above RMAN command？（）  

• A、 Only data files and the control file are backed up.
• B、 Archived redo logs are backed up only if the database is open during the backup.
• C、 The backup is deleted after one day，regardless of the default retention policy settings. 
• D、 The backup becomes obsolete after one day，regardless of the default retention policy settings.

第16题：

You issue the following command：   RMAN>CONFIGURE BACKUP OPTIMIZATION ON；   What is the result of this command on your backups？（）

• A、 An incremental backup strategy will be used automatically.
• B、 Read-only datafiles will not be backed up as long as backups of those files already exist and those backups meet established retention criteria.
• C、 RMAN will configure itself for maximum performance at the cost of CPU.
• D、 RMAN will configure itself for minimal OS/CPU impact at the cost of time to back up the database.
• E、 RMAN will automatically compress backups.

第17题：

You issue the following RMAN command to set a retention policy on a database：   RMAN>CONFIGURE RETENTION POLICY TO REDUNDANCY 2；   What will be the outcome of issuing this command？（）  

• A、 After two days，a backup will be marked obsolete
• B、 After two days，a backup will be deleted from the media
• C、 If the RMAN repository has records of two or more recent backups of a file，then older backups will be deleted from the media.
• D、 If the RMAN repository has records of two or more recent backups of a file then older backups will be marked obsolete.

第18题：

第19题：

第20题：

第21题：

第22题：

第23题：

第24题：