Oracle 统计信息窗口的相关知识

生产环境有一套库从10月份开始，统计信息收集的动作就变的不正常，后来通过手动drop窗口，重新创建统计信息窗口解决。

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查询窗口状态
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select * from dba_autotask_window_clients;

WINDOW_NAME                    WINDOW_NEXT_TIME                         WINDO AUTOTASK OPTIMIZE SEGMENT_ SQL_TUNE HEALTH_M
------------------------------ ---------------------------------------- ----- -------- -------- -------- -------- --------
MONDAY_WINDOW                  03-DEC-18 10.00.00.000000 PM +08:00      FALSE ENABLED  ENABLED  DISABLED DISABLED DISABLED
TUESDAY_WINDOW                 27-NOV-18 10.00.00.000000 PM +08:00      FALSE ENABLED  ENABLED  DISABLED DISABLED DISABLED
WEDNESDAY_WINDOW               28-NOV-18 10.00.00.000000 PM +08:00      FALSE ENABLED  ENABLED  DISABLED DISABLED DISABLED
THURSDAY_WINDOW                29-NOV-18 10.00.00.000000 PM +08:00      FALSE ENABLED  ENABLED  DISABLED DISABLED DISABLED
FRIDAY_WINDOW                  30-NOV-18 10.00.00.000000 PM +08:00      FALSE ENABLED  ENABLED  DISABLED DISABLED DISABLED
SATURDAY_WINDOW                01-DEC-18 06.00.00.000000 AM +08:00      FALSE ENABLED  ENABLED  DISABLED DISABLED DISABLED
SUNDAY_WINDOW                  02-DEC-18 06.00.00.000000 AM +08:00      FALSE ENABLED  ENABLED  DISABLED DISABLED DISABLED

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查询窗口的持续时间、重复频次
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select window_name,repeat_interval,duration,enabled  from dba_scheduler_windows;

WINDOW_NAME                    REPEAT_INTERVAL                          DURATION                                 ENABL
------------------------------ ---------------------------------------- ---------------------------------------- -----
WEEKNIGHT_WINDOW               freq=daily;byday=MON,TUE,WED,THU,FRI;byh +000 08:00:00                            FALSE
                               our=22;byminute=0; bysecond=0

WEEKEND_WINDOW                 freq=daily;byday=SAT;byhour=0;byminute=0 +002 00:00:00                            FALSE
                               ;bysecond=0

MONDAY_WINDOW                  freq=daily;byday=MON;byhour=22;byminute= +000 04:00:00                            TRUE
                               0; bysecond=0

TUESDAY_WINDOW                 freq=daily;byday=TUE;byhour=22;byminute= +000 04:00:00                            TRUE
                               0; bysecond=0

WINDOW_NAME                    REPEAT_INTERVAL                          DURATION                                 ENABL
------------------------------ ---------------------------------------- ---------------------------------------- -----

WEDNESDAY_WINDOW               freq=daily;byday=WED;byhour=22;byminute= +000 04:00:00                            TRUE
                               0; bysecond=0

THURSDAY_WINDOW                freq=daily;byday=THU;byhour=22;byminute= +000 04:00:00                            TRUE
                               0; bysecond=0

FRIDAY_WINDOW                  freq=daily;byday=FRI;byhour=22;byminute= +000 04:00:00                            TRUE
                               0; bysecond=0

SATURDAY_WINDOW                freq=daily;byday=SAT;byhour=6;byminute=0 +000 20:00:00                            TRUE

WINDOW_NAME                    REPEAT_INTERVAL                          DURATION                                 ENABL
------------------------------ ---------------------------------------- ---------------------------------------- -----
                               ; bysecond=0

SUNDAY_WINDOW                  freq=daily;byday=SUN;byhour=6;byminute=0 +000 20:00:00                            TRUE
                               ; bysecond=0

　

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查询窗口的持续时间
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DBA_AUTOTASK_WINDOW_HISTORY

CLIENT_NAME          WINDOW_NAME                    WINDOW_START_TIME                        WINDOW_DURATION                          JOBS_CREATED JOBS_STARTED JOBS_COMPLETED WINDOW_END_TIME
-------------------- ------------------------------ ---------------------------------------- ---------------------------------------- ------------ ------------ -------------- ---------------------------------------------------------------------------
auto optimizer stats MONDAY_WINDOW                  26-NOV-18 10.00.00.531345 PM +08:00      +000000000 13:27:27.402436                          1            1           0 27-NOV-18 11.27.27.933781 AM +08:00
 collection

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查询窗口的持续时间
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