在Oracle的11g版本中提供了統計數據自動收集的功能。在部署安裝11g Oracle軟件過程中，其中有一個步驟便是提示是否啟動這個功能(默認是啟用這個功能)。

1、查看自動收集統計信息的任務及狀態：

SQL> select client_name,status from dba_autotask_client;CLIENT_NAME STATUS ---------------------------------------------------------------- -------- auto optimizer stats collection ENABLED auto space advisor ENABLED sql tuning advisor DISABLEDSQL>

2、禁止自動收集統計信息的任務

SQL> exec DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'auto optimizer stats collection',operation => NULL,window_name => NULL);PL/SQL procedure successfully completed.SQL> select client_name,status from dba_autotask_client;CLIENT_NAME STATUS ---------------------------------------------------------------- -------- auto optimizer stats collection DISABLED auto space advisor ENABLED sql tuning advisor DISABLEDSQL>

3、啟用自動收集統計信息的任務

SQL> exec DBMS_AUTO_TASK_ADMIN.ENABLE(client_name => 'auto optimizer stats collection',operation => NULL,window_name => NULL);PL/SQL procedure successfully completed.SQL> select client_name,status from dba_autotask_client;CLIENT_NAME STATUS ---------------------------------------------------------------- -------- auto optimizer stats collection ENABLED auto space advisor ENABLED sql tuning advisor DISABLEDSQL>

4、獲得當前自動收集統計信息的執行時間：

SQL> col WINDOW_NAME format a20 SQL> col REPEAT_INTERVAL format a70 SQL> col DURATION format a20 SQL> set line 180 SQL> select t1.window_name,t1.repeat_interval,t1.duration 2 from dba_scheduler_windows t1,dba_scheduler_wingroup_members t23 where t1.window_name=t2.window_name and t2.window_group_name in ('MAINTENANCE_WINDOW_GROUP','BSLN_MAINTAIN_STATS_SCHED');WINDOW_NAME REPEAT_INTERVAL DURATION -------------------- ---------------------------------------------------------------------- -------------------- WEDNESDAY_WINDOW freq=daily;byday=WED;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 FRIDAY_WINDOW freq=daily;byday=FRI;byhour=22;byminute=0; bysecond=0 +000 04:00:007 rows selected.SQL>

其中：WINDOW_NAME：任務名 ? ? ??REPEAT_INTERVAL：任務重復間隔時間 ? ? ?DURATION：持續時間

5.修改統計信息執行的時間：

1.停止任務： SQL> BEGIN2 DBMS_SCHEDULER.DISABLE(3 name => '"SYS"."THURSDAY_WINDOW"',4 force => TRUE); --停止任務是true5 END;6 /SQL>2.修改任務的持續時間，單位是分鐘： SQL> BEGIN2 DBMS_SCHEDULER.SET_ATTRIBUTE(3 name => '"SYS"."THURSDAY_WINDOW"',4 attribute => 'DURATION',5 value => numtodsinterval(60,'minute'));6 END;7 / SQL>3.開始執行時間，BYHOUR=2，表示2點開始執行： SQL> BEGIN2 DBMS_SCHEDULER.SET_ATTRIBUTE(3 name => '"SYS"."THURSDAY_WINDOW"',4 attribute => 'REPEAT_INTERVAL',5 value => 'freq=daily;byday=THU;byhour=10;byminute=40;bysecond=0');6 END;7 /SQL> 4.開啟任務： SQL> BEGIN2 DBMS_SCHEDULER.ENABLE(3 name => '"SYS"."THURSDAY_WINDOW"');4 END;5 / SQL> 5.查看修改后的情況： SQL> select t1.window_name,t1.repeat_interval,t1.duration 2 from dba_scheduler_windows t1,dba_scheduler_wingroup_members t23 where t1.window_name=t2.window_name and t2.window_group_name in ('MAINTENANCE_WINDOW_GROUP','BSLN_MAINTAIN_STATS_SCHED');WINDOW_NAME REPEAT_INTERVAL DURATION -------------------- ---------------------------------------------------------------------- -------------------- WEDNESDAY_WINDOW freq=daily;byday=WED;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=10;byminute=40;bysecond=0 +000 01:00:00 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 FRIDAY_WINDOW freq=daily;byday=FRI;byhour=22;byminute=0; bysecond=0 +000 04:00:00SQL>

6.查看統計信息執行的歷史記錄

--維護窗口組 select * from dba_scheduler_window_groups; --維護窗口組對應窗口 select * from dba_scheduler_wingroup_members --維護窗口歷史信息 select* from dba_scheduler_windows--查詢自動收集任務正在執行的job select * from DBA_AUTOTASK_CLIENT_JOB; --查詢自動收集任務歷史執行狀態 select * from DBA_AUTOTASK_JOB_HISTORY; select * from DBA_AUTOTASK_CLIENT_HISTORY;

?

--整理自網絡

轉載于:https://www.cnblogs.com/polestar/p/4431428.html

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