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- Question 102
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Question 102/112
While performing database backup to tape via the media manager interface, you notice that tape streaming is not happening because RMAN is not sending data blocks fast enough to the tape drive.
Which two actions would you take for tape streaming to happen during the backup?
Which two actions would you take for tape streaming to happen during the backup?
Correct Answer: B,E
Explanation/Reference:
Explanation:
Allocation of Tape Buffers If you back up to or restore from an SBT device, then by default the database allocates four buffers for each channel for the tape writers. The size of the tape I/O buffers is platform- dependent. You can change this value with the PARMS and BLKSIZE parameters of the ALLOCATE CHANNEL or CONFIGURE CHANNEL command. You can improve backup performance by adjusting the level of multiplexing, which is number of input files simultaneously read and then written into the same RMAN backup piece. The level of multiplexing is the minimum of the MAXOPENFILES setting on the channel and the number of input files placed in each backup set. The following table makes recommendations for adjusting the level of multiplexing.
Reference: http://docs.oracle.com/database/121/BRADV/rcmtunin.htm#BRADV90072
Explanation:
Allocation of Tape Buffers If you back up to or restore from an SBT device, then by default the database allocates four buffers for each channel for the tape writers. The size of the tape I/O buffers is platform- dependent. You can change this value with the PARMS and BLKSIZE parameters of the ALLOCATE CHANNEL or CONFIGURE CHANNEL command. You can improve backup performance by adjusting the level of multiplexing, which is number of input files simultaneously read and then written into the same RMAN backup piece. The level of multiplexing is the minimum of the MAXOPENFILES setting on the channel and the number of input files placed in each backup set. The following table makes recommendations for adjusting the level of multiplexing.
Reference: http://docs.oracle.com/database/121/BRADV/rcmtunin.htm#BRADV90072
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