最近数据库升级后rman备份出现了很多等待事件
SQL> select * from v$version;
BANNER
------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
SQL>
SQL> SELECT sid,event FROM v$session WHERE wait_class#<>6;
SID EVENT
---------- ----------------------------------------------------------------
1165 Backup Restore Throttle sleep
1208 Backup Restore Throttle sleep
1292 Backup Restore Throttle sleep
1379 Backup Restore Throttle sleep
1552 Backup Restore Throttle sleep
2239 resmgr:cpu quantum
2542 SQL*Net message to client
查询alert日志信息
Tue Oct 23 22:00:00 2012
Setting Resource Manager plan SCHEDULER[0x256B668]:DEFAULT_MAINTENANCE_PLAN via scheduler window
Setting Resource Manager plan DEFAULT_MAINTENANCE_PLAN via parameter
Tue Oct 23 22:00:00 2012
Starting background process VKRM
Tue Oct 23 22:00:00 2012
VKRM started with pid=120, OS id=16419
Tue Oct 23 22:00:02 2012
Begin automatic SQL Tuning Advisor run for special tuning task "SYS_AUTO_SQL_TUNING_TASK"
Tue Oct 23 22:00:34 2012
Thread 1 advanced to log sequence 18849 (LGWR switch)
Current log# 1 seq# 18849 mem# 0: /oradata/finance/datafile/redo01.log
Current log# 1 seq# 18849 mem# 1: /oradata/finance/datafile/redo01_1.log
Tue Oct 23 22:00:38 2012
Archived Log entry 19993 added for thread 1 sequence 18848 ID 0x99d4983c dest 1:
Tue Oct 23 23:00:05 2012
End automatic SQL Tuning Advisor run for special tuning task "SYS_AUTO_SQL_TUNING_TASK"
Tue Oct 23 23:30:10 2012
Thread 1 advanced to log sequence 18850 (LGWR switch)
Current log# 4 seq# 18850 mem# 0: /oradata/finance/datafile/redo04.log
Current log# 4 seq# 18850 mem# 1: /oradata/finance/datafile/redo04_4.log
Tue Oct 23 23:30:14 2012
Archived Log entry 19994 added for thread 1 sequence 18849 ID 0x99d4983c dest 1:
Wed Oct 24 01:17:07 2012
Thread 1 advanced to log sequence 18851 (LGWR switch)
Current log# 5 seq# 18851 mem# 0: /oradata/finance/datafile/redo05.log
Current log# 5 seq# 18851 mem# 1: /oradata/finance/datafile/redo05_5.log
Wed Oct 24 01:17:17 2012
Archived Log entry 19995 added for thread 1 sequence 18850 ID 0x99d4983c dest 1:
Wed Oct 24 02:00:00 2012
Closing scheduler window
Closing Resource Manager plan via scheduler window
Clearing Resource Manager plan via parameter
Wed Oct 24 07:23:20 2012
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,所有rman运行任务，Backup Restore Throttle sleep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
------------------------------
WEEKNIGHT_WINDOW
WEEKEND_WINDOW
MONDAY_WINDOW
TUESDAY_WINDOW
WEDNESDAY_WINDOW
THURSDAY_WINDOW
FRIDAY_WINDOW
SATURDAY_WINDOW
SUNDAY_WINDOW
9 rows selected.
execute dbms_scheduler.set_attribute('WEEKNIGHT_WINDOW','RESOURCE_PLAN','');
execute dbms_scheduler.set_attribute('WEEKEND_WINDOW','RESOURCE_PLAN','');
execute dbms_scheduler.set_attribute('MONDAY_WINDOW','RESOURCE_PLAN','');
execute dbms_scheduler.set_attribute('TUESDAY_WINDOW','RESOURCE_PLAN','');
execute dbms_scheduler.set_attribute('WEDNESDAY_WINDOW','RESOURCE_PLAN','');
execute dbms_scheduler.set_attribute('THURSDAY_WINDOW','RESOURCE_PLAN','');
execute dbms_scheduler.set_attribute('FRIDAY_WINDOW','RESOURCE_PLAN','');
execute dbms_scheduler.set_attribute('SATURDAY_WINDOW','RESOURCE_PLAN','');
execute dbms_scheduler.set_attribute('SUNDAY_WINDOW','RESOURCE_PLAN','');
