OCP-1Z0-053-V13.02-652题

652.Tape streaming is not happening while performing RMAN tape backup. On investigation, you find that

it is not because of the incremental backup or the empty file backup and that RMAN is sending data

blocks to the tape drive fast enough.

What could be a solution to make tape streaming happen during the backup?

A. Configure backup optimization

B. Configure the channel to increase MAXOPENFILES

C. Configure the channel to increase the capacity with the RATE parameter

D. Configure the channel to adjust the tape buffer size with the BLKSIZE option

Answer: C

答案解析：

参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmtunin.htm#BRADV90070

RATE Channel Parameter

In the

ALLOCATE

and

CONFIGURE CHANNEL

commands, the

RATE

parameter specifies the bytes per second that are read on a channel. You can use this parameter to set an upper limit for bytes read
so that RMAN does not consume excessive disk bandwidth and degrade online performance. Essentially,

RATE

serves as a backup throttle. For example, if you set

RATE 1500K

, and if each disk drive delivers 3 megabytes per second, then
the channel leaves some disk bandwidth available to the online system.