Oracle 11G统计信息自动收集及调整
2024-10-08 12:01:49
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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