OCP-1Z0-053-V12.02-505题
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505.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;
Answer: C
答案解析:
参考:http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmbckad.htm#BRADV89571
根据官方文档,正确答案为D
Duplexing Backup Sets with CONFIGURE BACKUP COPIES
As explained in "Configuring Backup Duplexing", the CONFIGURE
...
BACKUP
COPIES
command specifies the number of identical backup sets to create on the specified device type. This setting applies to all backup sets except control file autobackups (because the autobackup of a control file always produces one copy) and backup sets when backed up with the BACKUP BACKUPSET
command.
To duplex a backup with CONFIGURE ... BACKUP COPIES:
Configure the number of copies on the desired device type for datafiles and archived redo logs on the desired device types.
By default,
CONFIGURE
...
BACKUP
COPIES
is set to1
for each device type. The following example configures duplexing for datafiles and archived logs on tape and also duplexing for datafiles (but not archived redo logs) on disk:CONFIGURE DEVICE TYPE sbt PARALLELISM 1;CONFIGURE DEFAULT DEVICE TYPE TO sbt;CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '/disk1/%U', '/disk2/%U';CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE sbt TO 2;CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE sbt TO 2;CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2;Execute the
BACKUP
command.The following command backs up the database and archived logs to tape, making two copies of each data file and archived log:
BACKUP AS BACKUPSET DATABASE PLUS ARCHIVELOG;Because of the configured formats for the disk channel, the following command backs up the database to disk, placing one copy of the backup sets produced in the
/disk1
directory and the other in the/disk2
directory:BACKUP DEVICE TYPE DISK AS BACKUPSET DATABASE;If the
FORMAT
clause were not configured onCONFIGURE CHANNNEL
, then you specifyFORMAT
on theBACKUP
command itself. For example, you issue the following command:BACKUP AS BACKUPSET DATABASEFORMAT '/disk1/%U','/disk2/%U';Issue a
LIST
BACKUP
command to see a listing of backup sets and pieces.For example, enter the following command:
LIST BACKUP SUMMARY;The
#Copies
column shows the number of backup sets, which may have been produced by duplexing or by multiple backup commands.
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