Oracle Study之--resmgr:cpu quantum等待事件

创新互联建站专注为客户提供全方位的互联网综合服务，包含不限于成都做网站、网站制作、麻章网络推广、小程序定制开发、麻章网络营销、麻章企业策划、麻章品牌公关、搜索引擎seo、人物专访、企业宣传片、企业代运营等，从售前售中售后，我们都将竭诚为您服务，您的肯定，是我们大的嘉奖；创新互联建站为所有大学生创业者提供麻章建站搭建服务，24小时服务热线：18980820575，官方网址：www.cdcxhl.com

在AWR Report中出现“resmgr:cpu quantum”等待事件：

“resmgr:cpu quantum”等待事件：

参考metalink的解决方案，是oracle资源管理方面的问题，原文如下：

Symptoms

High waits on event 'resmgr:cpu quantum' might be noticed even when resource manager is disabled.    You already have confirmed parameter RESOURCE_MANAGER_PLAN is set to null but still noticing the above wait events.

Top 5 Timed Foreground Events:

Event                    Waits   Time(s)  Avg wait(ms) % DB time Wait Class ------------------------ ------- -------- ------------ -------------- ---------- ----------- resmgr:cpu quantum         1,596  346,281       216968          89.19 Scheduler db file scattered read   171,071   14,778           86           3.81 User I/O log file sync             28,575   10,810          378           2.78 Commit db file sequential read  943,457   6,569             7           1.69 User I/O DB CPU                     2,133   0.55

Cause

This could be due to DEFAULT_MAINTENANCE_PLAN. From 11g onwards every weekday window has a pre-defined Resource Plan called DEFAULT_MAINTENANCE_PLAN, which will become active once the related window opens.
Following entries can also be noted in alert log at the time of issue.

Wed Sep 16 02:00:00 2009
Clearing Resource Manager plan via parameter：
Wed Sep 16 22:00:00 2009
Setting Resource Manager plan SCHEDULER[0x2C55]:DEFAULT_MAINTENANCE_PLAN via scheduler window
Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameter
Wed Sep 16 22:00:05 2009
Begin automatic SQL Tuning Advisor run for special tuning task "SYS_AUTO_SQL_TUNING_TASK"

Solution

To disable the DEFAULT_MAINTENANCE_PLAN you can use the below steps as suggested inNote 786346.1
1. Set the current resource manager plan to null (or another plan that is not restrictive):

alter system set resource_manager_plan='';

2. Change the active windows to use the null resource manager plan (or other nonrestrictive plan)
using:3. Then, for each window_name (WINDOW_NAME from DBA_SCHEDULER_WINDOWS), run:

execute dbms_scheduler.set_attribute('WEEKNIGHT_WINDOW','RESOURCE_PLAN',''); execute dbms_scheduler.set_attribute('WEEKEND_WINDOW','RESOURCE_PLAN','');


3. Then, for each window_name (WINDOW_NAME from DBA_SCHEDULER_WINDOWS), run:

execute dbms_scheduler.set_attribute('','RESOURCE_PLAN','');

execute dbms_scheduler.set_attribute('','RESOURCE_PLAN','');

References

NOTE:392037.1 - Database Hangs. Sessions wait for 'resmgr:cpu quantum'
NOTE:756734.1 - 11g: Scheduler Maintenance Tasks or Autotasks
NOTE:786346.1 - Resource Manager and Sql Tunning Advisory DEFAULT_MAINTENANCE_PLAN
NOTE:806893.1 - Large Waits With The Wait Event "Resmgr:Cpu Quantum"
注意：

但是很多用户会发现禁用资源计划很多时候没有作用.可以禁用Oracle缺省启用的资源调度,最后通过以下参数设置解决问题:
_resource_manager_always_on = false

另外有需要云服务器可以了解下创新互联cdcxhl.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

分享文章：OracleStudy之--resmgr:cpuquantum等待事件-创新互联
链接地址：http://scyingshan.cn/article/deihci.html