oracle自动统计信息
2015-02-23 20:19
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在11g中,默认自动收集统计信息的时间为晚上10点(周一到周五,4个小时),早上6点(周六,周日,20个小时),
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select a.window_name, a.repeat_interval,a.duration from dba_scheduler_windows a, dba_scheduler_wingroup_members b where a.window_name = b.window_name and b.window_group_name = 'MAINTENANCE_WINDOW_GROUP'; WINDOW_NAME REPEAT_INTERVAL DURATION ------------------------------ ------------------------------------------------------------ -------------------- WEDNESDAY_WINDOW freq=daily;byday=WED;byhour=22;byminute=0; bysecond=0 +000 04:00:00 FRIDAY_WINDOW freq=daily;byday=FRI;byhour=22;byminute=0; bysecond=0 +000 04:00:00 SATURDAY_WINDOW freq=daily;byday=SAT;byhour=6;byminute=0; bysecond=0 +000 20:00:00 THURSDAY_WINDOW freq=daily;byday=THU;byhour=22;byminute=0; bysecond=0 +000 04:00:00 TUESDAY_WINDOW freq=daily;byday=TUE;byhour=22;byminute=0; bysecond=0 +000 04:00:00 SUNDAY_WINDOW freq=daily;byday=SUN;byhour=6;byminute=0; bysecond=0 +000 20:00:00 MONDAY_WINDOW freq=daily;byday=MON;byhour=22;byminute=0; bysecond=0 +000 04:00:00 由于很多系统晚上10点还是处于业务高峰期,因此有必要调整下时间,这个要根据各自的业务自己判断,在我们系统调为: 周一到周五,凌晨1点开始,持续5个小时; 周六、周日,凌晨1点开始,持续10个小时。 用sys用户执行如下语句即可: begin sys.dbms_scheduler.set_attribute(name => 'SYS.MONDAY_WINDOW', attribute => 'repeat_interval', value => 'freq=daily;byday=MON;byhour=1;byminute=0; bysecond=0'); sys.dbms_scheduler.set_attribute(name => 'SYS.MONDAY_WINDOW', attribute => 'duration', value => '0 05:00:00'); end; / begin sys.dbms_scheduler.set_attribute(name => 'SYS.TUESDAY_WINDOW', attribute => 'repeat_interval', value => 'freq=daily;byday=TUE;byhour=1;byminute=0; bysecond=0'); sys.dbms_scheduler.set_attribute(name => 'SYS.TUESDAY_WINDOW', attribute => 'duration', value => '0 05:00:00'); end; / begin sys.dbms_scheduler.set_attribute(name => 'SYS.WEDNESDAY_WINDOW', attribute => 'repeat_interval', value => 'freq=daily;byday=WED;byhour=1;byminute=0; bysecond=0'); sys.dbms_scheduler.set_attribute(name => 'SYS.WEDNESDAY_WINDOW', attribute => 'duration', value => '0 05:00:00'); end; / begin sys.dbms_scheduler.set_attribute(name => 'SYS.THURSDAY_WINDOW', attribute => 'repeat_interval', value => 'freq=daily;byday=THU;byhour=1;byminute=0; bysecond=0'); sys.dbms_scheduler.set_attribute(name => 'SYS.THURSDAY_WINDOW', attribute => 'duration', value => '0 05:00:00'); end; / begin sys.dbms_scheduler.set_attribute(name => 'SYS.FRIDAY_WINDOW', attribute => 'repeat_interval', value => 'freq=daily;byday=FRI;byhour=1;byminute=0; bysecond=0'); sys.dbms_scheduler.set_attribute(name => 'SYS.FRIDAY_WINDOW', attribute => 'duration', value => '0 05:00:00'); end; / begin sys.dbms_scheduler.set_attribute(name => 'SYS.SATURDAY_WINDOW', attribute => 'repeat_interval', value => 'freq=daily;byday=SAT;byhour=1;byminute=0; bysecond=0'); sys.dbms_scheduler.set_attribute(name => 'SYS.SATURDAY_WINDOW', attribute => 'duration', value => '0 10:00:00'); end; / begin sys.dbms_scheduler.set_attribute(name => 'SYS.SUNDAY_WINDOW', attribute => 'repeat_interval', value => 'freq=daily;byday=SUN;byhour=1;byminute=0; bysecond=0'); sys.dbms_scheduler.set_attribute(name => 'SYS.SUNDAY_WINDOW', attribute => 'duration', value => '0 10:00:00'); end; / 执行后结果如下: WINDOW_NAME REPEAT_INTERVAL DURATION ------------------------------ ------------------------------------------------------------ -------------------- WEDNESDAY_WINDOW freq=daily;byday=WED;byhour=1;byminute=0; bysecond=0 +000 05:00:00 FRIDAY_WINDOW freq=daily;byday=FRI;byhour=1;byminute=0; bysecond=0 +000 05:00:00 SATURDAY_WINDOW freq=daily;byday=SAT;byhour=1;byminute=0; bysecond=0 +000 10:00:00 THURSDAY_WINDOW freq=daily;byday=THU;byhour=1;byminute=0; bysecond=0 +000 05:00:00 TUESDAY_WINDOW freq=daily;byday=TUE;byhour=1;byminute=0; bysecond=0 +000 05:00:00 SUNDAY_WINDOW freq=daily;byday=SUN;byhour=1;byminute=0; bysecond=0 +000 10:00:00 MONDAY_WINDOW freq=daily;byday=MON;byhour=1;byminute=0; bysecond=0 +000 05:00:00 查看是否开启job select client_name,status from DBA_AUTOTASK_CLIENT where client_name='auto optimizer stats collection'; CLIENT_NAME STATUS ---------------------------------------------------------------- -------- auto optimizer stats collection ENABLED 开启 BEGIN dbms_auto_task_admin.enable( client_name => 'auto optimizer stats collection', operation => NULL, window_name => NULL); END; / 关闭 BEGIN dbms_auto_task_admin.disable( client_name => 'auto optimizer stats collection', operation => NULL, window_name => NULL); END; / |
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