生产库在备份时占用了大量的IO资源，导致业务受到部分影响，考虑对rman的备份速度进行限制，查了一下文档，如下：
I/O Read Rate of Backups
By default, RMAN uses all available I/O bandwidth to read/write to disk. You can limit the I/O resources consumed by a backup job with the RATE option of the ALLOCATE CHANNEL or CONFIGURE CHANNEL commands. The RATE option specifies the maximum number of bytes for each second that RMAN reads on the channel.
For example, you can configure automatic channels to limit each channel to read 1 MB a second:
CONFIGURE DEVICE TYPE sbt PARALLELISM 2; CONFIGURE DEFAULT DEVICE TYPE TO sbt; CONFIGURE CHANNEL DEVICE TYPE sbt RATE 1M;
In effect, the RATE option throttles RMAN so that a backup job does not consume excessive I/O bandwidth on the computer.
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