Oracle自动维护任务
Oracle自动维护任务
最近看到alter日志里面有VKRM的报错信息，所以查询学习了下。From Oracle 11g, each day has its own windows and each of it has been specified default resource plan.This is something new for me too.So, i think that would be reason for seeing VKRM process in the alert log.
SQL> select WINDOW_NAME,RESOURCE_PLAN from DBA_SCHEDULER_WINDOWS;
WINDOW_NAME RESOURCE_PLAN
------------------------------ ------------------------------
MONDAY_WINDOW DEFAULT_MAINTENANCE_PLAN
TUESDAY_WINDOW DEFAULT_MAINTENANCE_PLAN
WEDNESDAY_WINDOW DEFAULT_MAINTENANCE_PLAN
THURSDAY_WINDOW DEFAULT_MAINTENANCE_PLAN
FRIDAY_WINDOW DEFAULT_MAINTENANCE_PLAN
SATURDAY_WINDOW DEFAULT_MAINTENANCE_PLAN
SUNDAY_WINDOW DEFAULT_MAINTENANCE_PLAN
WEEKNIGHT_WINDOW
WEEKEND_WINDOW
SYS@>AppD> SELECT WINDOW_GROUP_NAME,ENABLED,NEXT_START_DATE,COMMENTS FROM DBA_SCHEDULER_WINDOW_GROUPS
WINDOW_GROUP_NAME ENABL NEXT_START_DATE COMMENTS
-------------------------- ---------------------------------------- --------------------------------------
MAINTENANCE_WINDOW_GROUP TRUE 14-MAR-11 10.00.00.000000 PM Window group for Automated Maintenance
ORA$AT_WGRP_OS TRUE 14-MAR-11 10.00.00.000000 PM auto optimizer stats collection
ORA$AT_WGRP_SA TRUE 14-MAR-11 10.00.00.000000 PM auto space advisor
ORA$AT_WGRP_SQ TRUE 14-MAR-11 10.00.00.000000 PM sql tuning advisor
SQL> select client_name ,status from DBA_AUTOTASK_CLIENT;
CLIENT_NAME STATUS
---------------------------------------------------------------- --------
auto optimizer stats collection ENABLED
auto space advisor ENABLED
sql tuning advisor ENABLED
自动维护任务是一种按规则自动启动的数据库维护操作任务。比如自动收集为查询优化器使用的统计信息。自动维护任务按维护窗口自动运行。所谓自动维护窗口是按照预定义的间隔时间窗口。
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