在Oracle的11g版本中提供了統計資料自動收集的功能。在部署安裝11g Oracle軟體過程中，其中有一個步驟便是提示是否啟動這個功能(預設是啟用這個功能)。

一、檢視自動收集統計資訊的任務及狀態：

SQL> select client_name,status from dba_autotask_client;

CLIENT_NAME                                                      STATUS
---------------------------------------------------------------- --------
auto optimizer stats collection                                  ENABLED
auto space advisor                                               ENABLED
sql tuning advisor                                               DISABLED

SQL>

二、禁止自動收集統計資訊的任務

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                                               DISABLED

三、啟用自動收集統計資訊的任務

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                                               DISABLED

四、獲得當前自動收集統計資訊的執行時間：

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
    from dba_scheduler_windows t1,dba_scheduler_wingroup_members t2
    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 04:00:00

7 rows selected.

其中：WINDOW_NAME：任務名       REPEAT_INTERVAL：任務重複間隔時間      DURATION：持續時間

五.修改統計資訊執行的時間：

1.停止任務：
SQL> BEGIN
      DBMS_SCHEDULER.DISABLE(
      name => '"SYS"."THURSDAY_WINDOW"',
      force => TRUE); --停止任務是true
    END;
    /

SQL>

2.修改任務的持續時間，單位是分鐘：
SQL> BEGIN
      DBMS_SCHEDULER.SET_ATTRIBUTE(
      name => '"SYS"."THURSDAY_WINDOW"',
      attribute => 'DURATION',
      value => numtodsinterval(60,'minute'));
    END;
    /

3.開始執行時間，BYHOUR=2，表示2點開始執行：
SQL> BEGIN
      DBMS_SCHEDULER.SET_ATTRIBUTE(
      name => '"SYS"."THURSDAY_WINDOW"',
      attribute => 'REPEAT_INTERVAL',
      value => 'freq=daily;byday=THU;byhour=10;byminute=40;bysecond=0');
    END;
    /

4.開啟任務：
SQL> BEGIN
     DBMS_SCHEDULER.ENABLE(
     name => '"SYS"."THURSDAY_WINDOW"');
   END;
   /

5.檢視修改後的情況：

SQL> select t1.window_name,t1.repeat_interval,t1.duration
    from dba_scheduler_windows t1,dba_scheduler_wingroup_members t2
    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 04:00:00

六.檢視統計資訊執行的歷史記錄

--維護視窗組
select * from dba_scheduler_window_groups;

--維護視窗組對應視窗
select * from dba_scheduler_wingroup_members

--維護視窗歷史資訊
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;

Oracle 11g 之自動收集統計資訊

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