resmgr:cpu quantum等待
SQL> select * from v$version;?BANNER--------------------------------------------Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit ProductionPL/SQL Release 11.2.0.2.0 - ProductionCORE??? 11.2.0.2.0????? ProductionTNS for IBM/AIX RISC System/6000: Version 11.2.0.2.0 - ProductionNLSRTL Version 11.2.0.2.0 - Production?SQL> SELECT sid,event FROM v$session WHERE wait_class#<>6;????????SID EVENT---------- ----------------------------????????27 resmgr:cpu quantum????????38 resmgr:cpu quantum????????43 resmgr:cpu quantum????????46 resmgr:cpu quantum???????113 resmgr:cpu quantum???????118 resmgr:cpu quantum???????125 resmgr:cpu quantum???????140 resmgr:cpu quantum???????143 resmgr:cpu quantum???????199 resmgr:cpu quantum???????205 resmgr:cpu quantum????????SID EVENT---------- ----------------------------???????212 resmgr:cpu quantum???????220 resmgr:cpu quantum???????221 resmgr:cpu quantum???????223 resmgr:cpu quantum???????238 resmgr:cpu quantum???????241 resmgr:cpu quantum???????301 resmgr:cpu quantum???????313 resmgr:cpu quantum???????314 resmgr:cpu quantum???????405 resmgr:cpu quantum???????410 resmgr:cpu quantum????????SID EVENT---------- ----------------------------???????415 resmgr:cpu quantum???????435 resmgr:cpu quantum???????502 resmgr:cpu quantum???????503 resmgr:cpu quantum???????509 resmgr:cpu quantum???????510 resmgr:cpu quantum???????512 resmgr:cpu quantum???????521 resmgr:cpu quantum???????526 resmgr:cpu quantum???????528 resmgr:cpu quantum???????532 resmgr:cpu quantum????????SID EVENT---------- ----------------------------???????533 enq: TX - row lock contention???????589 resmgr:cpu quantum???????596 resmgr:cpu quantum???????600 resmgr:cpu quantum???????609 resmgr:cpu quantum???????611 resmgr:cpu quantum???????625 resmgr:cpu quantum???????635 null event???????707 resmgr:cpu quantum???????727 resmgr:cpu quantum???????731 SQL*Net message to client?44 rows selected.
查询alert日志
Sat Jun 09 06:00:00 2012Setting Resource Manager plan SCHEDULER[0x310C]:DEFAULT_MAINTENANCE_PLAN via scheduler windowSetting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameterSun Jun 10 02:00:00 2012Closing Resource Manager plan via scheduler windowClearing Resource Manager plan via parameter?Sun Jun 10 06:00:00 2012Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameterMon Jun 11 02:00:00 2012Closing Resource Manager plan via scheduler windowClearing Resource Manager plan via parameter?Mon Jun 11 22:00:00 2012Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameterTue Jun 12 02:00:00 2012Closing scheduler windowClosing Resource Manager plan via scheduler windowClearing Resource Manager plan via parameter?Tue Jun 12 22:00:00 2012Setting Resource Manager plan SCHEDULER[0x3108]:DEFAULT_MAINTENANCE_PLAN via scheduler windowSetting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameterWed Jun 13 02:00:00 2012Closing scheduler windowClosing Resource Manager plan via scheduler windowClearing Resource Manager plan via parameter从这里可以看出来，因为SCHEDULER定时启动和关闭资源管理的DEFAULT_MAINTENANCE_PLAN从而导致在晚上10点到2点Resource Manager plan处于启用状态.上线测试刚好在晚上2点之前,所有当时查询的时候发现很多resmgr:cpu quantum等待是因为Resource Manager plan启用导致(使用SCHEDULER控制其启用和关闭),很多情况下数据库跑的应用比较单一，不是十分的需要启动资源管理.
在11g中关闭方法如下
1. Set the current resource manager plan to null (or another plan that is not restrictive):?alter system set resource_manager_plan='' scope=both;?2. Change the active windows to use the null resource manager plan (or other nonrestrictive plan) using:?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('<window name>','RESOURCE_PLAN','');?SQL> select WINDOW_NAME? from DBA_SCHEDULER_WINDOWS;?WINDOW_NAME------------------------------MONDAY_WINDOWTUESDAY_WINDOWWEDNESDAY_WINDOWTHURSDAY_WINDOWFRIDAY_WINDOWSATURDAY_WINDOWSUNDAY_WINDOWWEEKNIGHT_WINDOWWEEKEND_WINDOW?9 rows selected.