单项选择题

A. Because row IDs may change during the flashback oper……

Before a Flashback Table operation，you execute the following command：
ALTER TABLE employees ENABLE ROW MOVEMENT；
Why would you need this to be executed？（）

A. Because row IDs may change during the flashback operation
B. Because the object number changes after the flashback operation
C. Because the rows are retrieved from the recycle bin during the flashback operation
D. Because the table is moved forward and back to a temporary during the flashback opertion

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热门试题

多项选择题Whichthreetypesoffilescanbeautomaticallyplacedintheflashrecoveryareafastrecoveryareain11gRelease2？（）

A. Alert log file
B. Archived redo log files
C. Control file autobackups
D. Server Parameter file （SPFILE）
E. Recovery Manager （RMAN） backup piece

单项选择题Youwanttousetheautomaticmanagementofbackupandrecoveryoperationsfeaturesforyourdatabase.Whichconfigurationmustyouset？（）

A. Enable the flash recovery area and specify it as the archived redo log destination.
B. Disable the flash recovery area and start the database instance in ARCHIVELOG mode.
C. Enable the flash recovery area but do not specify it as the archived redo log destination.
D. Disable the flash recovery area and start the database instance in NOARCHIVELOG mode.

多项选择题Examine the following command used to perform incremental level 0 backup： RMAN> BACKUP INCREMENTAL LEVEL 0 DATABASE； To enable the block change tracking， after the incremental level 0 backup you issued the following command： SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE ’ mydir rman_change_track.f’；To perform incremental level 1 cumulative backup， you issued the following command： RMAN> BACKUP INCREMENTAL LEVEL 1 CUMULATIVE DATABASE； Which two statements are true in the above situation？（）

A. The block change tracking data will be used only from the next incremental 0 backup.
B. The incremental backup will use change tracking data for accomplishing the backup.
C. The incremental backup will not use change tracking data for accomplishing the backup.
D. The block track file will scan all the blocks and create bitmap for all the blocks backed up in the level 0 backup.

单项选择题To accomplish user-managed backup for the USERS tablespace， you issued the following command to put the database in backup mode： SQL> ALTER TABLESPACE users BEGIN BACKUP； While copying the file to the backup destination a power outage caused the instance to te minate abnormally. Which statement is true about the next database startup and the USERS tablespace？（）

A. The database will open，and the tablespace automatically comes out of the backup mode.
B. The database will be mounted，and recovery must be performed on the USERS tablespace.
C. The database will be mounted，and data files in the USERS tablespace must be taken out of the backup mode.
D. The database will not be mounted，and you must restore all the data files for the USERS tablespace from the backup，and perform recovery.

多项选择题Youaremanaginga24*7database.Thebackupstrategyforthedatabaseistoperformuser-managedbackups.Identifytwoprerequisitestoperformthebackups.（）

A. The database must be opened in restricted mode.
B. The database must be configured to run in ARCHIVELOG mode.
C. The tablespaces are required to be in backup mode before taking the backup.
D. The tablespaces are required to be in read-only mode before taking the backup