根据其是否具有明显中枢镇静作用，H1受体阻断剂分为______和______H1受体阻断剂。

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.

when backup commands are running in server sessions:What could have helped you to correlate server sessions with channels？（）

A. Implement RMAN multiplexing

B. Set the DEBUG ON in the RMAN script

C. Specify the command ID in the RMAN script

D. Use a tag with the RMAN BACKUP command

L 0 DATABASE;The next day, you issue the following command:BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE;Which statement about the use of the change tracking file is true？（）

A. RMAN reads the block change tracking file only when it performs the incremental level 0 backup.

B. RMAN reads the block change tracking file when it performs both incremental backups.

C. RMAN reads the block change tracking file only when it performs the incremental level 1 backup.

D. RMAN does not read the block change tracking file when it performs either incremental backup.

You have tape drives of 300 MB each. The SBT channel is configured for Recovery Manager (RMAN).To accomplish the backup, you issued the following RMAN command:RMAN> BACKUP SECTION SIZE 300M TABLESPACE users;Which two statements are true about the execution of the above command？ （）(Choose two.)

A. The backup piece size will be limited to 300 MB

B. The RMAN uses multiplexing to perform backup

C. The operation is accomplished using the default channel available

D. The RMAN parallelizes the backup although the parallelism is not set for a channel

igure 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

.- The recovery window is set to 7 days in RMAN.- The most recent backup to disk for the TOOLS tablespace was taken on November 3, 2007.- The TOOLS tablespace is read-only since November 4, 2007.On November 23, 2007, you issue the RMAN command to back up the database to disk.Which statement is true regarding the backup of the TOOLS tablespace？（）

A. The RMAN backup fails because the TOOLS tablespace is read-only

B. The RMAN skips the backup of the tablespace because backup optimization is enabled

C. The RMAN makes backup because optimization can be enabled only for backups to disk

D. The RMAN makes the backup because no backup of the tablespace exists within the seven day window

Your multitenant container database (CDB) contains a pluggable database, HR_PDB. The default permanent tablespace in HR_PDB is USERDATA. The container database (CDB) is open and you connect RMAN.You want to issue the following RMAN command:RMAN > BACKUP TABLESPACE hr_pdb:userdata;Which task should you perform before issuing the command？（）

A. Place the root container in ARHCHIVELOG mode.

B. Take the user data tablespace offline.

C. Place the root container in the nomount stage.

D. Ensure that HR_PDB is open.

A. Provide a password for the encryption

B. Set up an Oracle wallet for the encryption

C. No setup is required as it is a default encryption method

D. Both Oracle wallet and password must be set up for the encryption

Examine the following RMAN command:RMAN>CONFIGURE ENCRYPTION FOR DATABASE ON;RMAN>BACKUP DATABASE PLUS ARCHIVELOG;Which prerequisite must be met before accomplishing the backup？（）

A. Provide a password for the encryption

B. Set up an Oracle wallet for the encryption

C. No setup is required as it is a default encryption method

D. Both Oracle wallet and password must be set up for the encryption