OCP-1Z0-053-V12.02-527题_this configuration reduces the forwarding performa-优快云博客

本文链接：https://blog.youkuaiyun.com/rlhua/article/details/12982085

本文探讨了在Oracle ASM磁盘组重新平衡操作中调整ASM_POWER_LIMIT参数的影响。该参数控制重新平衡操作的并行度及速度，设置较高的值可以加快重新平衡过程。

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527.What is the result of increasing the value of the parameter ASM_POWER_LIMIT during a rebalance

operation?

A. The ASM rebalance operation will likely consume fewer resources and complete in a shorter amount of

time.

B. The ASM rebalance operation will consume fewer resources and complete in a longer amount of time.

C. The ASM rebalance operation will be parallelized and should complete in a shorter amount of time.

D. There is no ASM_POWER_LIMIT setting used in ASM.

E. None of the above

Answer: C

答案解析：

参考：http://blog.youkuaiyun.com/rlhua/article/details/12972983

ASM_POWER_LIMIT控制重新平衡操作的速度。值的范围从1 到11，11 表示最快。如果省略，该值默认为1。

You can manually rebalance the files in a disk group using the REBALANCE clause of the ALTER DISKGROUP statement. This would normally not be required, because Oracle ASM automatically rebalances disk groups when their configuration changes. You might want to do a manual rebalance operation to control the speed of what would otherwise be an automatic rebalance operation.

The POWER clause of the ALTER DISKGROUP ... REBALANCE statement specifies the degree of parallelism, and thus the speed of the rebalance operation. It can be set to a minimum value of 0 which halts a rebalancing operation until the statement is either implicitly or explicitly re-run. A higher value increases the speed of the rebalance operation.

The default rebalance power is set by the ASM_POWER_LIMIT initialization parameter. The range of values for the POWER clause is the same for the ASM_POWER_LIMIT initialization parameter.

官方参考：http://docs.oracle.com/cd/E11882_01/server.112/e18951/asmdiskgrps.htm#BABCCEAB