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oracle自动统计信息时间的修改过程

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;
/

总结

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