Oracle 统计信息介绍

 1 BEGIN
 2   DBMS_AUTO_TASK_ADMIN.enable(client_name => ‘auto optimizer stats collection‘,
 3                               operation   => NULL,
 4                               window_name => ‘MONDAY_WINDOW‘);
 5 END;
 6  
 7 BEGIN
 8   DBMS_AUTO_TASK_ADMIN.disable(client_name => ‘auto optimizer stats collection‘,
 9                                operation   => NULL,
10                                window_name => NULL);
11 END;

1 BEGIN
2   DBMS_AUTO_TASK_ADMIN.enable();
3 END;
4 BEGIN
5   DBMS_AUTO_TASK_ADMIN.disable();
6 END;

 1 --设置开始时间
 2 BEGIN
 3   DBMS_SCHEDULER.SET_ATTRIBUTE(name      => ‘"SYS"."WEDNESDAY_WINDOW"‘,
 4                                attribute => ‘REPEAT_INTERVAL‘,
 5                                value     => ‘freq=daily;byday=WED;byhour=07;byminute=46;bysecond=0‘);
 6 END;
 7 --设置执行时长，如果设置值小于10分钟，统计信息貌似不能搜集
 8 BEGIN
 9   DBMS_SCHEDULER.SET_ATTRIBUTE(name      => ‘"SYS"."WEDNESDAY_WINDOW"‘,
10                                attribute => ‘DURATION‘,
11                                VALUE     => ‘+000 00:20:00‘);
12 END;
13 --禁用窗口，禁用后dba_autotask_window_clients视图相关信息消失
14 BEGIN
15   dbms_scheduler.disable(name => ‘WEDNESDAY_WINDOW‘, force => TRUE);
16 END;
17 --启用窗口
18 BEGIN
19   dbms_scheduler.enable(name => ‘WEDNESDAY_WINDOW‘);
20 END;
21 --停止JOB
22 BEGIN
23   dbms_scheduler.stop_job(‘ORA$AUTOTASK_CLEAN‘);
24 END;
25 --手动打开窗口
26 BEGIN
27   dbms_scheduler.open_window(‘WEDNESDAY_WINDOW‘);
28 END;
29 --关闭窗口
30 BEGIN
31   dbms_scheduler.close_window(‘WEDNESDAY_WINDOW‘);
32 END;