在11G中，引入了一個(gè)名為 gather_stats_prog 的自動(dòng)運(yùn)行任務(wù)專用于自動(dòng)收集統(tǒng)計(jì)信息。其對(duì)應(yīng)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(dòng)統(tǒng)計(jì)信息收集作業(yè)可配置的維護(hù)窗口增加到7個(gè)，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(shí)是從晚上10點(diǎn)開始，最多運(yùn)行8小時(shí)；周末是從零點(diǎn)開始，最多可以運(yùn)行24小時(shí)。從$ORACLE_HOME/rdbms/admin/catmwin.sql中可以看10/11g自動(dòng)統(tǒng)計(jì)信息收集作業(yè)的整體流程。

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