OCP-1Z0-053-200题-130题-288

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最新推荐文章于 2025-05-16 11:26:28 发布

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本文介绍如何使用ASM_POWER_LIMIT参数控制Automatic Storage Management (ASM)中磁盘组再平衡操作的速度，确保这些操作不会干扰正常的用户I/O活动。

QUESTION 130

You are maintaining the SALES database. You have added a new disk to a disk group.Automatic Storage

Management performs the rebalancing activity. You want to speed up the rebalancing activity.

Which parameter should you specify to control the speed of the rebalancing activity?

A. ASM_POWER_LIMIT

B. ASM_DISKSTRING

C. ASM_DISKGROUPS

D. INSTANCE_TYPE

Answer: A

Explanation/Reference:

Section: Database Architecture & Resource Management, RAC, ASM

You should use the ASM_POWER_LIMITparameter to control the speed of the rebalancing activity. To ensure

that rebalancing operations do not interfere with the ongoing user I/O, the ASM_POWER_LIMITparameter

controls the speed of rebalancing operations. The value for the ASM_POWER_LIMITparameter ranges from 0

to 11. The default value of 1 indicates low overhead. This is a dynamic parameter; therefore, you can set this

to a low value during the day and to a higher valueovernight whenever a disk rebalancing operation must

occur. You can also control the speed of rebalancingby specifying a POWER clause in an ALTER DISKGROUP

statement or when rebalancing.

The option stating that the ASM_DISKSTRINGparameter is used to control the speed of rebalancing is

incorrect. The ASM_DISKSTRINGparameter specifies one or more strings, which areoperating system

dependent, to limit the disk devices that can be used to create disk groups.

The option stating that the ASM_DISKGROUPSparameter is used to control the speed of rebalancing is

incorrect. The ASM_DISKGROUPSparameter specifies a list containing the names ofthe disk groups that will be

automatically mounted by the ASM instance at startup or by the ALTER DISKGROUP ALL MOUNT;statement.

The option stating that the INSTANCE_TYPEparameter is used to control the speed of rebalancing is incorrect.

The INSTANCE_TYPEparameter identifies the instance as an ASM instanceor non-ASM instance. For an ASM

instance, this parameter must be set to a value of ASM.