ORACLE 参数之 ASM_POWER_LIMIT
ASM_POWER_LIMIT
| Property | Description |
|---|---|
| Parameter type | Integer |
| Default value | 1 |
| Modifiable | ALTER SESSION, ALTER SYSTEM |
| Range of values | 0 to 11Foot 1 |
| Oracle RAC | Multiple instances can have different values. |
Footnote 1 Beginning with Oracle Database 11g Release 2 (11.2.0.2), if the COMPATIBLE.ASM disk group attribute is set to 11.2.0.2 or higher, then the range of values is 0 to 1024.
Note:
This parameter may only be specified in an Automatic Storage Management instance. ASM_POWER_LIMIT specifies the maximum power on an Automatic Storage Management instance for disk rebalancing. The higher the limit, the faster rebalancing will complete. Lower values will take longer, but consume fewer processing and I/O resources.
If the POWER clause of a rebalance operation is not specified, then the default power will be the value of ASM_POWER_LIMIT.
该值用来调整ASM管理时再平衡的功效问题；设置一个较大的值，那么将消耗比较多的资源，但是在短的时间内能够完成；反之，则用时较长；该功能可以在操作中指定，如果省略，那么变量 asm_power_limit的值作为操作的默认值；
OCP 考核题
Q127. What is the result of increasing the value of theparameter ASM_POWER_LIMIT during arebalance operation?
A. The ASM rebalance operation will likely consume fewerresources 可能消耗较少的资源 and complete in a shorter amount of time.
B. The ASM rebalance operation will consume fewer resourcesand complete in a longer amount of time.
C. The ASM rebalance operation will be parallelized andshould 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
Q489. You are maintaining the SALES database. You have addeda new disk to a disk group. Automatic Storage Management performs therebalancing activity. You want to speed up the rebalancing activity.
Which parameter should you specify to control the speed ofthe rebalancing activity?
A.ASM_POWER_LIMIT
B. ASM_DISKSTRING
C. ASM_DISKGROUPS
D. INSTANCE_TYPE
Answer: A