在11G中，引入了一個名為 gather_stats_prog 的自動運行任務專用于自動收集統計信息。其對應的客戶端名稱為"auto optimizer stats collection"： SQL> select client_name,task_name,operation_name,status from dba_autotask_task;CLIENT_NAME TASK_NAME OPERATION_NAME STATUS ---------------------------------------- ------------------------------ ------------------------------ -------- sql tuning advisor AUTO_SQL_TUNING_PROG automatic sql tuning task ENABLED auto optimizer stats collection gather_stats_prog auto optimizer stats job ENABLED auto space advisor auto_space_advisor_prog auto space advisor job ENABLEDSQL> select program_action from dba_scheduler_programs where program_name='GATHER_STATS_PROG';PROGRAM_ACTION --------------------------------------------- dbms_stats.gather_database_stats_job_procSQL>11G中，自動統計信息收集作業可配置的維護窗口增加到7個，分別為： SQL> select window_name,autotask_status from dba_autotask_window_clients;WINDOW_NAME AUTOTASK ------------------------------ -------- MONDAY_WINDOW ENABLED TUESDAY_WINDOW ENABLED WEDNESDAY_WINDOW ENABLED THURSDAY_WINDOW ENABLED FRIDAY_WINDOW ENABLED SATURDAY_WINDOW ENABLED SUNDAY_WINDOW ENABLED7 rows selected.SQL> select window_name,repeat_interval,duration from dba_scheduler_windows where enabled='TRUE';WINDOW_NAME REPEAT_INTERVAL DURATION ------------------------------ ------------------------------------------------------- ------------------------------ MONDAY_WINDOW freq=daily;byday=MON;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 WEDNESDAY_WINDOW freq=daily;byday=WED;byhour=22;byminute=0; bysecond=0 +000 04:00:00 THURSDAY_WINDOW freq=daily;byday=THU;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 SUNDAY_WINDOW freq=daily;byday=SUN;byhour=6;byminute=0; bysecond=0 +000 20:00:007 rows selected.SQL> 10G中，平時是從晚上10點開始，最多運行8小時；周末是從零點開始，最多可以運行24小時。從$ORACLE_HOME/rdbms/admin/catmwin.sql中可以看10/11g自動統計信息收集作業的整體流程。

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