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
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmtunin.htm#BRADV90070
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.
在分配和配置信道命令时，RATE参数指定在信道上读取的每秒字节数。你可以使用这个参数设置每秒读取字节上限，RMAN就不会消耗过多的磁盘带宽和降低网络流量。从本质上讲，RATE作为备份的节气门。例如，如果你设置速率为1500K，如果每个磁盘驱动器提供每秒3 MB带宽，然后留下一些磁盘带宽信道可用的在线系统。
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
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmtunin.htm#BRADV90070
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.
在分配和配置信道命令时，RATE参数指定在信道上读取的每秒字节数。你可以使用这个参数设置每秒读取字节上限，RMAN就不会消耗过多的磁盘带宽和降低网络流量。从本质上讲，RATE作为备份的节气门。例如，如果你设置速率为1500K，如果每个磁盘驱动器提供每秒3 MB带宽，然后留下一些磁盘带宽信道可用的在线系统。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/81227/viewspace-2120891/ ，如需转载，请注明出处，否则将追究法律责任。
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