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oracle自动统计信息时间的修改过程记录

2022-09-01 17:45Rhys-Oracle 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。

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      - 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：

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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：

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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。

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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;
/

总结

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原文链接：https://blog.csdn.net/rhys_oracle/article/details/122356341

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