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标签归档:resmgr:cpu quantum
resmgr:cpu quantum等待
昨天晚上数据库升级(使用exp/imp从9i升级到11g),开启业务,数据库出现很多resmgr:cpu quantum等待
SQL> select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production PL/SQL Release 11.2.0.2.0 - Production CORE 11.2.0.2.0 Production TNS for IBM/AIX RISC System/6000: Version 11.2.0.2.0 - Production NLSRTL Version 11.2.0.2.0 - Production SQL> SELECT sid,event FROM v$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 2012 Setting Resource Manager plan SCHEDULER[0x310C]:DEFAULT_MAINTENANCE_PLAN via scheduler window Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameter Sun Jun 10 02:00:00 2012 Closing Resource Manager plan via scheduler window Clearing Resource Manager plan via parameter Sun Jun 10 06:00:00 2012 Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameter Mon Jun 11 02:00:00 2012 Closing Resource Manager plan via scheduler window Clearing Resource Manager plan via parameter Mon Jun 11 22:00:00 2012 Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameter Tue Jun 12 02:00:00 2012 Closing scheduler window Closing Resource Manager plan via scheduler window Clearing Resource Manager plan via parameter Tue Jun 12 22:00:00 2012 Setting Resource Manager plan SCHEDULER[0x3108]:DEFAULT_MAINTENANCE_PLAN via scheduler window Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameter Wed Jun 13 02:00:00 2012 Closing scheduler window Closing Resource Manager plan via scheduler window Clearing 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_WINDOW TUESDAY_WINDOW WEDNESDAY_WINDOW THURSDAY_WINDOW FRIDAY_WINDOW SATURDAY_WINDOW SUNDAY_WINDOW WEEKNIGHT_WINDOW WEEKEND_WINDOW 9 rows selected.