Oracle自动收集统计信息怎么实现

这篇文章主要介绍“Oracle自动收集统计信息怎么实现”，在日常操作中，相信很多人在Oracle自动收集统计信息怎么实现问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”Oracle自动收集统计信息怎么实现”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

在Oracle的11g版本中提供了统计数据自动收集的功能。在部署安装11g Oracle软件过程中，其中有一个步骤便是提示是否启动这个功能(默认是启用这个功能)。一、查看自动收集统计信息的任务及状态：SQL> select client_name,status from dba_autotask_client;CLIENT_NAME                                                      STATUS---------------------------------------------------------------- --------auto optimizer stats collection                                  ENABLEDauto space advisor                                               ENABLEDsql tuning advisor                                               DISABLEDSQL>二、禁止自动收集统计信息的任务SQL> exec DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => auto optimizer stats collection,operation => NULL,window_name => NULL);PL/SQL procedure successfully completed.SQL> select client_name,status from dba_autotask_client;CLIENT_NAME                                                      STATUS---------------------------------------------------------------- --------auto optimizer stats collection                                  DISABLEDauto space advisor                                               ENABLEDsql tuning advisor                                               DISABLED三、启用自动收集统计信息的任务SQL> exec DBMS_AUTO_TASK_ADMIN.ENABLE(client_name => auto optimizer stats collection,operation => NULL,window_name => NULL);PL/SQL procedure successfully completed.SQL> select client_name,status from dba_autotask_client;CLIENT_NAME                                                      STATUS---------------------------------------------------------------- --------auto optimizer stats collection                                  ENABLEDauto space advisor                                               ENABLEDsql tuning advisor                                               DISABLED四、获得当前自动收集统计信息的执行时间：SQL> col WINDOW_NAME format a20SQL> col REPEAT_INTERVAL format a70SQL> col DURATION format a20SQL> set line 180SQL> select t1.window_name,t1.repeat_interval,t1.duration from dba_scheduler_windows t1,dba_scheduler_wingroup_members t2where t1.window_name=t2.window_name and t2.window_group_name in (MAINTENANCE_WINDOW_GROUP,BSLN_MAINTAIN_STATS_SCHED);WINDOW_NAME          REPEAT_INTERVAL                                                        DURATION-------------------- ---------------------------------------------------------------------- --------------------WEDNESDAY_WINDOW     freq=daily;byday=WED;byhour=22;byminute=0; bysecond=0                  +000 04:00:00SATURDAY_WINDOW      freq=daily;byday=SAT;byhour=6;byminute=0; bysecond=0                   +000 20:00:00THURSDAY_WINDOW      freq=daily;byday=THU;byhour=22;byminute=0; bysecond=0                  +000 04:00:00TUESDAY_WINDOW       freq=daily;byday=TUE;byhour=22;byminute=0; bysecond=0                  +000 04:00:00SUNDAY_WINDOW        freq=daily;byday=SUN;byhour=6;byminute=0; bysecond=0                   +000 20:00:00MONDAY_WINDOW        freq=daily;byday=MON;byhour=22;byminute=0; bysecond=0                  +000 04:00:00FRIDAY_WINDOW        freq=daily;byday=FRI;byhour=22;byminute=0; bysecond=0                  +000 04:00:007 rows selected.其中：WINDOW_NAME：任务名       REPEAT_INTERVAL：任务重复间隔时间      DURATION：持续时间五.修改统计信息执行的时间：1.停止任务：SQL> BEGIN      DBMS_SCHEDULER.DISABLE(      name => "SYS"."THURSDAY_WINDOW",      force => TRUE);  --停止任务是true    END;    /SQL>2.修改任务的持续时间，单位是分钟：SQL> BEGIN      DBMS_SCHEDULER.SET_ATTRIBUTE(      name => "SYS"."THURSDAY_WINDOW",attribute => DURATION,      value => numtodsinterval(60,minute));    END;    /3.开始执行时间，BYHOUR=2，表示2点开始执行：SQL> BEGINDBMS_SCHEDULER.SET_ATTRIBUTE(      name => "SYS"."THURSDAY_WINDOW",      attribute => REPEAT_INTERVAL,value => freq=daily;byday=THU;byhour=10;byminute=40;bysecond=0);    END;    /4.开启任务：SQL> BEGIN     DBMS_SCHEDULER.ENABLE(name => "SYS"."THURSDAY_WINDOW");   END;   /5.查看修改后的情况：SQL> select t1.window_name,t1.repeat_interval,t1.duration from dba_scheduler_windows t1,dba_scheduler_wingroup_members t2where t1.window_name=t2.window_name and t2.window_group_name in (MAINTENANCE_WINDOW_GROUP,BSLN_MAINTAIN_STATS_SCHED);WINDOW_NAME          REPEAT_INTERVAL                                                        DURATION-------------------- ---------------------------------------------------------------------- --------------------WEDNESDAY_WINDOW     freq=daily;byday=WED;byhour=22;byminute=0; bysecond=0                  +000 04:00:00SATURDAY_WINDOW      freq=daily;byday=SAT;byhour=6;byminute=0; bysecond=0                   +000 20:00:00THURSDAY_WINDOW      freq=daily;byday=THU;byhour=10;byminute=40;bysecond=0                  +000 01:00:00TUESDAY_WINDOW       freq=daily;byday=TUE;byhour=22;byminute=0; bysecond=0                  +000 04:00:00SUNDAY_WINDOW        freq=daily;byday=SUN;byhour=6;byminute=0; bysecond=0                   +000 20:00:00MONDAY_WINDOW        freq=daily;byday=MON;byhour=22;byminute=0; bysecond=0                  +000 04:00:00FRIDAY_WINDOW        freq=daily;byday=FRI;byhour=22;byminute=0; bysecond=0                  +000 04:00:00六.查看统计信息执行的历史记录--维护窗口组select * from dba_scheduler_window_groups;--维护窗口组对应窗口select * from dba_scheduler_wingroup_members--维护窗口历史信息select* from dba_scheduler_windows--查询自动收集任务正在执行的job select * from DBA_AUTOTASK_CLIENT_JOB;--查询自动收集任务历史执行状态select * from DBA_AUTOTASK_JOB_HISTORY;select * from DBA_AUTOTASK_CLIENT_HISTORY;

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