关于11g+的统计信息收集
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1.a),check the task name(in database 11g the name is :autooptimizer stats collection ) and the windowgroup:
>>select client_name,status, attributes,window_group,service_name from dba_autotask_client whereclient_name='auto optimizer statscollection';
CLIENT_NAME STATUS WINDOW_GROUP
---------------------------------------- --------------------------------------
auto optimizer stats collection ENABLEDORA$AT_WGRP_OS
1.b),check the window name of the windowgroup:
>>select window_name from DBA_SCHEDULER_WINGROUP_MEMBERSwhere window_group_name ='ORA$AT_WGRP_OS';
WINDOW_NAME
------------------------------
MONDAY_WINDOW
TUESDAY_WINDOW
WEDNESDAY_WINDOW
THURSDAY_WINDOW
FRIDAY_WINDOW
SATURDAY_WINDOW
SUNDAY_WINDOW
1.c),check the start time and the duration of everywindow:
>>select window_name, REPEAT_INTERVAL, DURATION fromDBA_SCHEDULER_WINDOWS wherewindow_name='MONDAY_WINDOW';
WINDOW_NAME REPEAT_INTERVALDURATION
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
MONDAY_WINDOW freq=daily;byday=MON;byhour=22;byminute=0; bysecond=0+000 04:00:00
11g+ Automatic Maintenance Tasks
What is the name of the default stats gathering job on 11g?
The automatic statistics gathering job on 11g is called "autooptimizer stats collection".
What are the default windows for the automated maintenance task torun?
In 11g daily maintenance windows are provided. by default these aredefined as :- Weeknights: Starts at 10 p.m. and ends at 2 a.m.
- Weekends: Starts at 6 a.m. is 20 hours long.
See:Oracle® Database Administrator's Guide
11gRelease 2 (11.2)
Part Number E17120-05
Automated Maintenance Tasks Reference
Table 26-1 Predefined Maintenance Windows
http://docs.oracle.com/cd/E18283_01/server.112/e17120/tasks006.htm#CIHJHGCA
Document 743507.1How to Benefit fromAutomatic Maintenance Tasks Following the Removal of theGATHER_STATS_JOB in 11g? How do you change the default windows for the automated maintenancetask to run?
Maintenance windows can be modified using the DBMS_SCHEDULER PL/SQLpackage. For details see:Oracle® Database Administrator's Guide
11g Release 2 (11.2)
Part Number E17120-05
Configuring Maintenance Windows
http://docs.oracle.com/cd/E18283_01/server.112/e17120/tasks004.htm
Here is an example to change the default time for the dailymaintenance window for example to 2:00 AM instead of 10:00 PM usingthe following commands :BEGIN
dbms_scheduler.disable(
name => 'SATURDAY_WINDOW');
dbms_scheduler.set_attribute(
name => 'SATURDAY_WINDOW',
attribute=> 'repeat_interval',
value =>'freq=daily;byday=SAT;byhour=02;byminute=0;bysecond=0');
dbms_scheduler.enable(
name =>'SATURDAY_WINDOW');
END;
/
BEGIN
dbms_scheduler.disable(
name => 'SUNDAY_WINDOW');
dbms_scheduler.set_attribute(
name => 'SUNDAY_WINDOW',
attribute=> 'repeat_interval',
value =>'freq=daily;byday=SUN;byhour=02;byminute=0;bysecond=0');
dbms_scheduler.enable(
name =>'SUNDAY_WINDOW');
END;
/
BEGIN
dbms_scheduler.disable(
name => 'MONDAY_WINDOW');
dbms_scheduler.set_attribute(
name => 'MONDAY_WINDOW',
attribute=> 'repeat_interval',
value =>'freq=daily;byday=MON;byhour=02;byminute=0;bysecond=0');
dbms_scheduler.enable(
name =>'MONDAY_WINDOW');
END;
/
BEGIN
dbms_scheduler.disable(
name => 'TUESDAY_WINDOW');
dbms_scheduler.set_attribute(
name => 'TUESDAY_WINDOW',
attribute=> 'repeat_interval',
value =>'freq=daily;byday=TUE;byhour=02;byminute=0;bysecond=0');
dbms_scheduler.enable(
name =>'TUESDAY_WINDOW');
END;
/
BEGIN
dbms_scheduler.disable(
name => 'WEDNESDAY_WINDOW');
dbms_scheduler.set_attribute(
name => 'WEDNESDAY_WINDOW',
attribute=> 'repeat_interval',
value =>'freq=daily;byday=WED;byhour=02;byminute=0;bysecond=0');
dbms_scheduler.enable(
name =>'WEDNESDAY_WINDOW');
END;
/
BEGIN
dbms_scheduler.disable(
name => 'THURSDAY_WINDOW');
dbms_scheduler.set_attribute(
name => 'THURSDAY_WINDOW',
attribute=> 'repeat_interval',
value =>'freq=daily;byday=THU;byhour=02;byminute=0;bysecond=0');
dbms_scheduler.enable(
name =>'THURSDAY_WINDOW');
END;
/
BEGIN
dbms_scheduler.disable(
name => 'FRIDAY_WINDOW');
dbms_scheduler.set_attribute(
name => 'FRIDAY_WINDOW',
attribute=> 'repeat_interval',
value =>'freq=daily;byday=FRI;byhour=02;byminute=0;bysecond=0');
dbms_scheduler.enable(
name =>'FRIDAY_WINDOW');
END;
/- 参考:FAQ: Automatic Statistics Collection (文档 ID1233203.1)
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