Oracle 11G统计信息自动收集及调整

查询统计信息的收集所对应的task,以及当前状态

col CLIENT_NAME for a50
col TASK_NAME for a20
SELECT client_name, task_name, status
  FROM dba_autotask_task
 WHERE client_name = 'auto optimizer stats collection';
auto optimizer stats collection gather_stats_prog ENABLED;

CLIENT_NAME                           TASK_NAME        STATUS
--------------- ------------------  -----------------  -------
auto optimizer stats collection     gather_stats_prog  ENABLED

select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE    11.2.0.4.0    Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production

下面查询dba_scheduler_programs
--在scheduler_programs中，程序GATHER_STATS_PROG调用
--dbms_stats.gather_database_stats_job_proc来实现统计信息的自动收集

col PROGRAM_ACTION for a50
SELECT program_action, number_of_arguments, enabled
FROM dba_scheduler_programs
WHERE owner = 'SYS'
AND program_name = 'GATHER_STATS_PROG';

PROGRAM_ACTION                       NUMBER_OF_ARGUMENTS ENABL
-------------------------------------------------- ------------------- -----
dbms_stats.gather_database_stats_job_proc                 0 TRUE

2、查看自动收集统计信息是否开启

SELECT CLIENT_NAME, STATUS
  FROM DBA_AUTOTASK_CLIENT
 WHERE CLIENT_NAME = 'auto optimizer stats collection';

CLIENT_NAME                             STATUS
---------------------------------------------------------------- --------
auto optimizer stats collection                  ENABLED

统计信息收集的窗口组，如下查询

SELECT window_group
FROM dba_autotask_client
WHERE client_name = 'auto optimizer stats collection';

WINDOW_GROUP
----------------------------------------------------------------
ORA$AT_WGRP_OS

查询统计信息收集的具体窗口
--统计信息收集的时间窗口
--如下查询周一至周五时间为22点，周六日为6点
--此外持续也不相同，周一至周五为4小时，周六日为20个小时
--enabled为true表明当前的这些作业处于激活状态

col REPEAT_INTERVAL for a60
col DURATION for a30
SELECT w.window_name, w.repeat_interval, w.duration, w.enabled
  FROM dba_autotask_window_clients c, dba_scheduler_windows w
 WHERE c.window_name = w.window_name
   AND c.optimizer_stats = 'ENABLED';

WINDOW_NAME               REPEAT_INTERVAL                            DURATION               ENABL
------------------------------ ------------------------------------------------------------ ------------------------------ -----
MONDAY_WINDOW               freq=daily;byday=MON;byhour=22;byminute=0; bysecond=0        +000 04:00:00           TRUE
TUESDAY_WINDOW               freq=daily;byday=TUE;byhour=22;byminute=0; bysecond=0        +000 04:00:00           TRUE
WEDNESDAY_WINDOW           freq=daily;byday=WED;byhour=22;byminute=0; bysecond=0        +000 04:00:00           TRUE
THURSDAY_WINDOW            freq=daily;byday=THU;byhour=22;byminute=0; bysecond=0        +000 04:00:00           TRUE
FRIDAY_WINDOW               freq=daily;byday=FRI;byhour=22;byminute=0; bysecond=0        +000 04:00:00           TRUE
SATURDAY_WINDOW            freq=daily;byday=SAT;byhour=6;byminute=0; bysecond=0        +000 20:00:00           TRUE
SUNDAY_WINDOW               freq=daily;byday=SUN;byhour=6;byminute=0; bysecond=0        +000 20:00:00           TRUE

查看自动收集统计信息历史执行情况

SELECT * FROM dba_autotask_client_history WHERE client_name LIKE '%stats%';

CLIENT_NAME                                                      WINDOW_NAME                                                       WINDOW_START_TIME                                                                WINDOW_DURATION                                                                 JOBS_CREATED JOBS_STARTED JOBS_COMPLETED WINDOW_END_TIME
---------------------------------------------------------------- ----------------------------------------------------------------- -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- ------------ ------------ -------------- --------------------------------------------------------------------------------
auto optimizer stats collection                                  WEDNESDAY_WINDOW                                                  24-APR-19 10.00.00.084731 PM +08:00                                              +000000000 03:59:59.989882                                                                 1            1              1 25-APR-19 02.00.00.074613 AM +08:00
auto optimizer stats collection                                  THURSDAY_WINDOW                                                   25-APR-19 10.00.00.075150 PM +08:00                                              +000000000 03:59:59.973396                                                                 1            1              1 26-APR-19 02.00.00.048546 AM +08:00
auto optimizer stats collection                                  FRIDAY_WINDOW                                                     26-APR-19 10.00.00.088460 PM +08:00                                              +000000000 03:59:59.986848                                                                 1            1              1 27-APR-19 02.00.00.075308 AM +08:00
auto optimizer stats collection                                  SATURDAY_WINDOW                                                   27-APR-19 06.00.02.066587 AM +08:00                                              +000000000 19:59:58.014463                                                                 5            5              5 28-APR-19 02.00.00.081050 AM +08:00
auto optimizer stats collection                                  SUNDAY_WINDOW                                                     28-APR-19 06.00.00.180330 AM +08:00                                              +000000000 19:59:59.883249                                                                 5            5              5 29-APR-19 02.00.00.063579 AM +08:00
auto optimizer stats collection                                  MONDAY_WINDOW                                                     29-APR-19 10.00.00.071791 PM +08:00                                              +000000000 04:00:00.027280                                                                 1            1              1 30-APR-19 02.00.00.099071 AM +08:00
auto optimizer stats collection                                  TUESDAY_WINDOW                                                    30-APR-19 10.00.00.093139 PM +08:00                                              +000000000 03:59:59.989633                                                                 1            1              1 01-MAY-19 02.00.00.082772 AM +08:00
auto optimizer stats collection                                  WEDNESDAY_WINDOW                                                  01-MAY-19 10.00.00.104952 PM +08:00                                              +000000000 03:59:59.971842                                                                 1            1              1 02-MAY-19 02.00.00.076794 AM +08:00
auto optimizer stats collection                                  THURSDAY_WINDOW                                                   02-MAY-19 10.00.01.068409 PM +08:00                                              +000000000 03:59:58.983145                                                                 1            1              1 03-MAY-19 02.00.00.051554 AM +08:00
auto optimizer stats collection                                  FRIDAY_WINDOW                                                     03-MAY-19 10.00.00.077000 PM +08:00                                              +000000000 03:59:59.993378                                                                 1            1              1 04-MAY-19 02.00.00.070378 AM +08:00
auto optimizer stats collection                                  SATURDAY_WINDOW                                                   04-MAY-19 06.00.01.062949 AM +08:00                                              +000000000 19:59:59.018980                                                                 5            5              5 05-MAY-19 02.00.00.081929 AM +08:00
auto optimizer stats collection                                  SUNDAY_WINDOW                                                     05-MAY-19 06.00.00.073691 AM +08:00                                              +000000000 20:00:01.010166                                                                 5            5              5 06-MAY-19 02.00.01.083857 AM +08:00
auto optimizer stats collection                                  MONDAY_WINDOW                                                     06-MAY-19 10.00.00.090751 PM +08:00                                              +000000000 03:59:59.989213                                                                 1            1              1 07-MAY-19 02.00.00.079964 AM +08:00
auto optimizer stats collection                                  TUESDAY_WINDOW                                                    07-MAY-19 10.00.00.064104 PM +08:00                                              +000000000 04:00:00.016201                                                                 1            1              1 08-MAY-19 02.00.00.080305 AM +08:00
auto optimizer stats collection                                  WEDNESDAY_WINDOW                                                  08-MAY-19 10.00.00.065315 PM +08:00                                              +000000000 04:00:00.018545                                                                 1            1              1 09-MAY-19 02.00.00.083860 AM +08:00
auto optimizer stats collection                                  THURSDAY_WINDOW                                                   09-MAY-19 10.00.00.073837 PM +08:00                                              +000000000 03:59:59.980112                                                                 1            1              1 10-MAY-19 02.00.00.053949 AM +08:00
auto optimizer stats collection                                  FRIDAY_WINDOW                                                     10-MAY-19 10.00.00.074381 PM +08:00                                              +000000000 03:59:59.999777                                                                 1            1              1 11-MAY-19 02.00.00.074158 AM +08:00
auto optimizer stats collection                                  SATURDAY_WINDOW                                                   11-MAY-19 06.00.01.071340 AM +08:00                                              +000000000 19:59:59.004645                                                                 5            5              5 12-MAY-19 02.00.00.075985 AM +08:00
auto optimizer stats collection                                  SUNDAY_WINDOW                                                     12-MAY-19 06.00.01.066112 AM +08:00                                              +000000000 19:59:59.015558                                                                 5            5              5 13-MAY-19 02.00.00.081670 AM +08:00
auto optimizer stats collection                                  MONDAY_WINDOW                                                     13-MAY-19 10.00.01.074773 PM +08:00                                              +000000000 03:59:58.975154                                                                 1            1              1 14-MAY-19 02.00.00.049927 AM +08:00
CLIENT_NAME                                                      WINDOW_NAME                                                       WINDOW_START_TIME                                                                WINDOW_DURATION                                                                 JOBS_CREATED JOBS_STARTED JOBS_COMPLETED WINDOW_END_TIME
---------------------------------------------------------------- ----------------------------------------------------------------- -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- ------------ ------------ -------------- --------------------------------------------------------------------------------
auto optimizer stats collection                                  TUESDAY_WINDOW                                                    14-MAY-19 10.00.00.098044 PM +08:00                                              +000000000 03:59:59.951603                                                                 1            1              1 15-MAY-19 02.00.00.049647 AM +08:00
auto optimizer stats collection                                  WEDNESDAY_WINDOW                                                  15-MAY-19 10.00.00.099538 PM +08:00                                              +000000000 03:59:59.989331                                                                 1            1              1 16-MAY-19 02.00.00.088869 AM +08:00
auto optimizer stats collection                                  THURSDAY_WINDOW                                                   16-MAY-19 10.00.00.107495 PM +08:00                                              +000000000 03:59:59.938235                                                                 1            1              1 17-MAY-19 02.00.00.045730 AM +08:00
auto optimizer stats collection                                  FRIDAY_WINDOW                                                     17-MAY-19 10.00.00.084708 PM +08:00                                              +000000000 03:59:59.985142                                                                 1            1              1 18-MAY-19 02.00.00.069850 AM +08:00
auto optimizer stats collection                                  SATURDAY_WINDOW                                                   18-MAY-19 06.00.01.090394 AM +08:00                                              +000000000 19:59:58.980792                                                                 5            5              5 19-MAY-19 02.00.00.071186 AM +08:00
auto optimizer stats collection                                  SUNDAY_WINDOW                                                     19-MAY-19 06.00.01.075840 AM +08:00                                              +000000000 19:59:58.978655                                                                 5            5              5 20-MAY-19 02.00.00.054495 AM +08:00
auto optimizer stats collection                                  MONDAY_WINDOW                                                     20-MAY-19 10.00.00.109763 PM +08:00                                              +000000000 03:59:59.956340                                                                 1            1              1 21-MAY-19 02.00.00.066103 AM +08:00
auto optimizer stats collection                                  TUESDAY_WINDOW                                                    21-MAY-19 10.00.00.081639 PM +08:00                                              +000000000 03:59:59.965244                                                                 1            1              1 22-MAY-19 02.00.00.046883 AM +08:00
auto optimizer stats collection                                  WEDNESDAY_WINDOW                                                  22-MAY-19 10.00.01.060724 PM +08:00                                              +000000000 03:59:59.041174                                                                 1            1              1 23-MAY-19 02.00.00.101898 AM +08:00
auto optimizer stats collection                                  THURSDAY_WINDOW                                                   23-MAY-19 10.00.00.092859 PM +08:00                                              +000000000 03:59:59.978915                                                                 1            1              1 24-MAY-19 02.00.00.071774 AM +08:00
30 rows selected

统计信息收集调度时间禁用及修改

1、启用自动收集统计信息

BEGIN
  DBMS_AUTO_TASK_ADMIN.ENABLE(client_name => 'auto optimizer stats collection',
                              operation   => NULL,
                              window_name => NULL);
END;

2、禁用自动收集统计信息

BEGIN
  DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'auto optimizer stats collection',
                               operation   => NULL,
                               window_name => NULL);
END;

或者：

--禁用自动收集
exec DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'auto optimizer stats collection',operation => NULL,window_name => NULL);
--启用自动收集
exec DBMS_AUTO_TASK_ADMIN.ENABLE(client_name => 'auto optimizer stats collection',operation => NULL,window_name => NULL);
--查看job
SQL> select client_name,status from dba_autotask_client;
 
CLIENT_NAME                             STATUS
---------------------------------------------------------------- --------
auto optimizer stats collection                  ENABLED
auto space advisor                         ENABLED
sql tuning advisor                         ENABLED
 
SQL>

3、--执行上面的代码后，验证是否被禁用

CLIENT_NAME                             STATUS
---------------------------------------------------------------- --------
auto optimizer stats collection                  ENABLED

关闭单个调度时间窗口

BEGIN
  DBMS_AUTO_TASK_ADMIN.disable(client_name => 'auto optimizer stats collection',
                               operation   => NULL,
                               window_name => 'MONDAY_WINDOW');
END;
/

--验证关闭情况，如下，optimizer_stats列为DISABLED

SELECT window_name, window_next_time, window_active, optimizer_stats
  FROM dba_autotask_window_clients
 WHERE window_name = 'MONDAY_WINDOW'
 ORDER BY window_next_time;

WINDOW_NAME               WINDOW_NEXT_TIME                                WINDO OPTIMIZE
------------------------------ --------------------------------------------------------------------------- ----- --------
MONDAY_WINDOW               27-MAY-19 10.00.00.000000 PM PRC                        FALSE ENABLED

关闭所有时间调度窗口，验证略

       BEGIN
           DBMS_AUTO_TASK_ADMIN.disable (
              client_name   => 'auto optimizer stats collection',
              operation     => NULL,
              window_name   => NULL);
        END;
        /

开启单个调度时间窗口及所有时间调度窗口，只需要使用enable过程

  -- 注：单个应指定窗口名字，如window_name   => 'MONDAY_WINDOW'
        BEGIN
           DBMS_AUTO_TASK_ADMIN.enable (
              client_name   => 'auto optimizer stats collection',
              operation     => NULL,
              window_name   => NULL);
        END;
        /

--修改时间窗口到特定的时间
--如下示例，将周五时间窗口时间到晚间23点30分
BEGIN
  DBMS_SCHEDULER.DISABLE(name => '"SYS"."FRIDAY_WINDOW"', force => TRUE);
END;
 
BEGIN
  DBMS_SCHEDULER.SET_ATTRIBUTE(name      => '"SYS"."FRIDAY_WINDOW"',
                               attribute => 'REPEAT_INTERVAL',
                               VALUE     => 'FREQ=WEEKLY;BYDAY=FRI;BYHOUR=23;BYMINUTE=30;BYSECOND=0');
END;
 
BEGIN
  DBMS_SCHEDULER.ENABLE(name => '"SYS"."FRIDAY_WINDOW"');
END;

--验证修改
SELECT w.window_name, w.repeat_interval, w.duration, w.enabled
  FROM dba_autotask_window_clients c, dba_scheduler_windows w
 WHERE c.window_name = w.window_name
   AND c.optimizer_stats = 'ENABLED'
   AND c.window_name = 'FRIDAY_WINDOW';

WINDOW_NAME                    REPEAT_INTERVAL                                                                  DURATION                                                                        ENABLED
------------------------------ -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- -------
FRIDAY_WINDOW                  freq=daily;byday=FRI;byhour=22;byminute=0; bysecond=0                            +000 04:00:00                                                                   TRUE

--新增维护时间窗口
-- 假定我们要处理的是修改周一的时间窗口
-- 首先关闭周一的时间窗口
BEGIN
  DBMS_AUTO_TASK_ADMIN.disable(client_name => 'auto optimizer stats collection',
                               operation   => NULL,
                               window_name => 'MONDAY_WINDOW');
END;
/

--接下来创建一个窗口并设定时间调度间隔
--如下，每周一5点执行，持续时间为1小时
BEGIN
  DBMS_SCHEDULER.create_window(window_name     => 'STATS_WINDOW',
                               resource_plan   => 'DEFAULT_MAINTENANCE_PLAN',
                               repeat_interval => 'freq=daily;byday=MON;byhour=5;byminute=0; bysecond=0',
                               duration        => INTERVAL '' HOUR,
                               comments        => 'Test window for stats task');
EXCEPTION
  WHEN OTHERS THEN
    IF SQLCODE = -27477 THEN
      NULL;
    ELSE
      RAISE;
    END IF;
END;
 
BEGIN
  DBMS_SCHEDULER.set_attribute('STATS_WINDOW', 'SYSTEM', TRUE);
  DBMS_SCHEDULER.set_attribute('STATS_WINDOW',
                               'FOLLOW_DEFAULT_TIMEZONE',
                               TRUE);
EXCEPTION
  WHEN OTHERS THEN
    IF SQLCODE = -27477 THEN
      NULL;
    ELSE
      RAISE;
    END IF;
END;
/

SELECT window_name, repeat_interval, enabled
  FROM dba_scheduler_windows
 WHERE window_name = 'STATS_WINDOW';

--接下来将窗口STATS_WINDOW添加到维护窗口组

BEGIN
  DBMS_SCHEDULER.add_window_group_member('MAINTENANCE_WINDOW_GROUP',
                                         'STATS_WINDOW');
END;
/

SELECT WINDOW_NAME, WINDOW_NEXT_TIME, WINDOW_ACTIVE, OPTIMIZER_STATS
  FROM DBA_AUTOTASK_WINDOW_CLIENTS
 WHERE WINDOW_NAME in ('STATS_WINDOW', 'MONDAY_WINDOW')
 ORDER BY WINDOW_NEXT_TIME;

手工执行统计信息的自动收集

--执行下面的这个存储过程
EXEC DBMS_AUTO_TASK_IMMEDIATE.GATHER_OPTIMIZER_STATS;

--如下查询，scott表上的统计信息已更新
select TABLE_NAME,NUM_ROWS,BLOCKS,LAST_ANALYZED from dba_tables where TABLE_NAME='TB_OBJS';

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Oracle 11G统计信息自动收集及调整

统计信息收集调度时间禁用及修改

手工执行统计信息的自动收集

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