OCP-1Z0-053-V13.02-606题
606.Identify the channel settings that can be performed using the CONFIGURE CHANNEL or ALLOCATE
CHANNEL commands in RMAN (choose all that apply)
A. Limiting the input/output (I/O) bandwidth consumption
B. Specifying the size of backup sets and backup pieces
C. Specifying vendor-specific information for a media manager
D. Specifying the parallelism for backup and restore operations
Answer: AC
答案解析：
Whether you allocate channels manually or automatically, you can use channel control commands and options to do the following:
Control the operating system resources RMAN uses when performing RMAN operations. Affect the degree of parallelism for a backup or restore (in conjunctionwith the FILESPERSET parameter of the BACKUP command)
Set limits on I/O bandwidth consumption in kilobytes, megabytes, or gigabytes
(ALLOCATE CHANNEL ...RATE, CONFIGURE CHANNEL ... RATE)-check
Set limits on the size of backup pieces
(the MAXPIECESIZE parameter specified on the CONFIGURE CHANNEL and ALLOCATE CHANNEL commands)- half of answer B
Set limits on the size of backup sets
(the MAXSETSIZE parameter specified on the BACKUP and CONFIGURE commands)
- Not in the CONFIGURE CHANNEL and ALLOCATE CHANNEL(B is wrong)
Set limits on the number of concurrently open files (ALLOCATE CHANNEL ... MAXOPENFILES, CONFIGURE CHANNEL ... MAXOPENFILES)
Send vendor-specific commands to the media manager (SEND)
Specify vendor-specific parameters for the media manager
(ALLOCATE CHANNEL ... PARMS, CONFIGURE CHANNEL ... PARMS)-check
Specify which instance performs the operation
(ALLOCATE CHANNEL ... CONNECT, CONFIGURE CHANNEL ...CONNECT)
Oracle Press 1Z0-053 Exam Guide, Chapter 8: Monitoring and Tuning RMAN:
You can further tune your RMAN backup performance by tuning individual channels with the CONFIGURE
CHANNEL and ALLOCATE CHANNEL commands. Each CHANNEL command accepts the following parameters:
- MAXPIECESIZE: The maximum size of a backup piece
- RATE: The number of bytes per second read by RMAN on the channel
- MAXOPENFILES: The maximum number of input files that a channel can have open at a given time
The MAXPIECESIZE parameter is useful when you back up to disk and the underlying operating system limits
the size of an individual disk file, or when a tapemedia manager cannot split a backup piece across multiple tapes.
Note that the RATE parameter doesn't improve performance but throttles performance intentionally to limit the
disk bandwidth available to a channel. This is useful when your RMAN backups must occur during periods of
peak activity elsewhere in the database.
MAXOPENFILES was reviewed in the preceding section, but it is worth revisiting when you want to optimize
the performance of an individual channel. For example, you can use MAXOPENFILES to limit RMAN's use of
operating system file handles or buffers.
Oracle Press 1Z0-053 Exam Guide, Chapter 4: Creating RMAN Backups
References to PARALLELISM were only referenced as CONFIGURE DEVICE TYPE DISK PARALLELISM...
By default, any backups to disk default to a backupset backup type:
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default