oracle自动统计信息时间的修改过程记录
作者：Rhys-Oracle
这篇文章主要给大家介绍了关于oracle自动统计信息时间的修改过程,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
今天是2022年1月7日今天值夜班，同事让给优化一个sql，优化完成后，顺便看了下新系统的统计信息情况，发现在晚上做数据采集的时间，系统资源增加，发现是统计信息在跑，在模拟环境测试，特此记录。
- trc get trace path
- undo show undo info
- user | users list all users info
- version show database version
- xo <sql_id> [phv] xplan.display_awr for given sql_id (add execution order column)
- xpo <sql_id> [child_number] xplan.display_cursor for given sql_id(add execution order column)
- xp <sql_id> display_cursor for given sql_id
- x <sql_id> display_awr for given sql_id
NOTE
================
- Set environment variable DBUSER to change default connect string which is "/ as sysdba"
- Set environment variable ORA_TMP to the default temp directory (default if /tmp when not set)
[oracle@rhys ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Fri Jan 7 01:25:45 2022
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SYS@rhys> col REPEAT_INTERVAL for a60
SYS@rhys> set linesize 200
SYS@rhys> select t1.window_name,t1.repeat_interval,t1.duration from dba_scheduler_windows t1,dba_scheduler_wingroup_members t2
2 where t1.window_name=t2.window_name and t2.window_group_name='MAINTENANCE_WINDOW_GROUP';
WINDOW_NAME REPEAT_INTERVAL DURATION
------------------------------ ------------------------------------------------------------ ---------------------------------------------------------------------------
FRIDAY_WINDOW freq=daily;byday=FRI;byhour=22;byminute=0; bysecond=0 +000 04:00:00
MONDAY_WINDOW freq=daily;byday=MON;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 20:00:00
THURSDAY_WINDOW freq=daily;byday=THU;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
7 rows selected.
SYS@rhys>
查看状态：
SYS@rhys> select client_name,status from dba_autotask_client; CLIENT_NAME STATUS ---------------------------------------------------------------- -------- auto optimizer stats collection ENABLED auto space advisor ENABLED sql tuning advisor ENABLED SYS@rhys>
更改执行时间：
SYS@rhys> begin 2 dbms_scheduler.disable( name => 'SUNDAY_WINDOW', force => TRUE); 3 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."SUNDAY_WINDOW"',attribute=>'REPEAT_INTERVAL',value=>'freq=daily;byday=SUN;byhour=1;byminute=0; bysecond=0'); 4 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."SUNDAY_WINDOW"',attribute=>'DURATION',value=>numtodsinterval(240, 'minute')); 5 dbms_scheduler.enable( name => 'SUNDAY_WINDOW'); 6 dbms_scheduler.disable( name => 'SATURDAY_WINDOW', force => TRUE); 7 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."SATURDAY_WINDOW"',attribute=>'REPEAT_INTERVAL',value=>'freq=daily;byday=SAT;byhour=1;byminute=0; bysecond=0'); 8 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."SATURDAY_WINDOW"',attribute=>'DURATION',value=>numtodsinterval(240, 'minute')); 9 dbms_scheduler.enable( name => 'SATURDAY_WINDOW'); 10 dbms_scheduler.disable( name => 'FRIDAY_WINDOW', force => TRUE); 11 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."FRIDAY_WINDOW"',attribute=>'REPEAT_INTERVAL',value=>'freq=daily;byday=FRI;byhour=1;byminute=0; bysecond=0'); 12 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."FRIDAY_WINDOW"',attribute=>'DURATION',value=>numtodsinterval(240, 'minute')); 13 dbms_scheduler.enable( name => 'FRIDAY_WINDOW'); 14 dbms_scheduler.disable( name => 'THURSDAY_WINDOW', force => TRUE); 15 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."THURSDAY_WINDOW"',attribute=>'REPEAT_INTERVAL',value=>'freq=daily;byday=THU;byhour=1;byminute=0; bysecond=0'); 16 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."TUESDAY_WINDOW"',attribute=>'DURATION',value=>numtodsinterval(240, 'minute')); 17 dbms_scheduler.enable( name => 'THURSDAY_WINDOW'); 18 dbms_scheduler.disable( name => 'WEDNESDAY_WINDOW', force => TRUE); 19 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."WEDNESDAY_WINDOW"',attribute=>'REPEAT_INTERVAL',value=>'freq=daily;byday=WED;byhour=1;byminute=0; bysecond=0'); 20 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."WEDNESDAY_WINDOW"',attribute=>'DURATION',value=>numtodsinterval(240, 'minute')); 21 dbms_scheduler.enable( name => 'WEDNESDAY_WINDOW'); 22 dbms_scheduler.disable( name => 'TUESDAY_WINDOW', force => TRUE); 23 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."TUESDAY_WINDOW"',attribute=>'REPEAT_INTERVAL',value=>'freq=daily;byday=TUE;byhour=1;byminute=0; bysecond=0'); 24 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."TUESDAY_WINDOW"',attribute=>'DURATION',value=>numtodsinterval(240, 'minute')); 25 dbms_scheduler.enable( name => 'TUESDAY_WINDOW'); 26 dbms_scheduler.disable( name => 'MONDAY_WINDOW', force => TRUE); 27 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."MONDAY_WINDOW"',attribute=>'REPEAT_INTERVAL',value=>'freq=daily;byday=MON;byhour=1;byminute=0; bysecond=0'); 28 DBMS_SCHEDULER.SET_ATTRIBUTE(name=>'"SYS"."MONDAY_WINDOW"',attribute=>'DURATION',value=>numtodsinterval(240, 'minute')); 29 dbms_scheduler.enable( name => 'MONDAY_WINDOW'); 30 end; 31 / PL/SQL procedure successfully completed. SYS@rhys> select t1.window_name,t1.repeat_interval,t1.duration from dba_scheduler_windows t1,dba_scheduler_wingroup_members t2 2 where t1.window_name=t2.window_name and t2.window_group_name='MAINTENANCE_WINDOW_GROUP'; WINDOW_NAME REPEAT_INTERVAL DURATION ------------------------------ ------------------------------------------------------------ --------------------------------------------------------------------------- FRIDAY_WINDOW freq=daily;byday=FRI;byhour=1;byminute=0; bysecond=0 +000 04:00:00 MONDAY_WINDOW freq=daily;byday=MON;byhour=1;byminute=0; bysecond=0 +000 04:00:00 SATURDAY_WINDOW freq=daily;byday=SAT;byhour=1;byminute=0; bysecond=0 +000 04:00:00 SUNDAY_WINDOW freq=daily;byday=SUN;byhour=1;byminute=0; bysecond=0 +000 04:00:00 THURSDAY_WINDOW freq=daily;byday=THU;byhour=1;byminute=0; bysecond=0 +000 04:00:00 TUESDAY_WINDOW freq=daily;byday=TUE;byhour=1;byminute=0; bysecond=0 +000 04:00:00 WEDNESDAY_WINDOW freq=daily;byday=WED;byhour=1;byminute=0; bysecond=0 +000 04:00:00 7 rows selected. SYS@rhys>
更改完成。注意：每个schedule任务需要disable和enable之后才生效。
附：以下脚本可把Oracle自动统计信息收集周一到周五的时间窗口从22点调整为2点。
begin
dbms_scheduler.disable(name => 'MONDAY_WINDOW');
dbms_scheduler.set_attribute(name => 'MONDAY_WINDOW',
attribute => 'REPEAT_INTERVAL',
value => 'freq=daily;byday=MON;byhour=2;byminute=0; bysecond=0');
dbms_scheduler.enable(name => 'MONDAY_WINDOW');
end;
/
begin
dbms_scheduler.disable(name => 'TUESDAY_WINDOW');
dbms_scheduler.set_attribute(name => 'TUESDAY_WINDOW',
attribute => 'REPEAT_INTERVAL',
value => 'freq=daily;byday=TUE;byhour=2;byminute=0; bysecond=0');
dbms_scheduler.enable(name => 'TUESDAY_WINDOW');
end;
/
begin
dbms_scheduler.disable(name => 'WEDNESDAY_WINDOW');
dbms_scheduler.set_attribute(name => 'WEDNESDAY_WINDOW',
attribute => 'REPEAT_INTERVAL',
value => 'freq=daily;byday=WED;byhour=2;byminute=0; bysecond=0');
dbms_scheduler.enable(name => 'WEDNESDAY_WINDOW');
end;
/
begin
dbms_scheduler.disable(name => 'THURSDAY_WINDOW');
dbms_scheduler.set_attribute(name => 'THURSDAY_WINDOW',
attribute => 'REPEAT_INTERVAL',
value => 'freq=daily;byday=THU;byhour=2;byminute=0; bysecond=0');
dbms_scheduler.enable(name => 'THURSDAY_WINDOW');
end;
/
begin
dbms_scheduler.disable(name => 'FRIDAY_WINDOW');
dbms_scheduler.set_attribute(name => 'FRIDAY_WINDOW',
attribute => 'REPEAT_INTERVAL',
value => 'freq=daily;byday=FRI;byhour=2;byminute=0; bysecond=0');
dbms_scheduler.enable(name => 'FRIDAY_WINDOW');
end;
/
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