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 ENABLED
auto space advisor ENABLED
sql tuning advisor ENABLED
获得当前自动收集统计信息的执行时间：
1 select t1.window_name,t1.repeat_interval,t1.duration
2 from dba_scheduler_windows t1,dba_scheduler_wingroup_members t2
3* where t1.window_name=t2.window_name and t2.window_group_name in ('MAINTENANCE_WINDOW_GROUP','BSLN_MAINTAIN_STATS_SCHED')
SQL> /
WINDOW_NAME REPEAT_INTERVAL DURATION
-------------------- ---------------------------------------------------------------------- --------------------
MONDAY_WINDOW freq=daily;byday=MON;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
THURSDAY_WINDOW freq=daily;byday=THU;byhour=22;byminute=0; bysecond=0 +000 04:00:00
FRIDAY_WINDOW freq=daily;byday=FRI;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
已选择7行。
--禁止自动收集统计信息的任务
exec DBMS_AUTO_TASK_ADMIN.DISABLE(client_name => 'auto optimizer stats collection',operation => NULL,window_name => NULL);
--获得当前自动收集统计信息的执行时间
select t1.window_name, t1.repeat_interval, t1.duration
from dba_scheduler_windows t1, dba_scheduler_wingroup_members t2
where t1.window_name = t2.window_name
and t2.window_group_name = 'MAINTENANCE_WINDOW_GROUP';
修改统计信息执行的时间：
1.停止任务：
SQL> BEGIN
2 DBMS_SCHEDULER.DISABLE(
3 name => '"SYS"."THURSDAY_WINDOW"',
4 force => TRUE); --停止任务是true
5 END;
6 /
2.修改任务的持续时间，单位是分钟：
SQL> BEGIN
2 DBMS_SCHEDULER.SET_ATTRIBUTE(
3 name => '"SYS"."THURSDAY_WINDOW"',
4 attribute => 'DURATION',
5 value => numtodsinterval(60,'minute'));
6 END;
7 /
SQL>
3.开始执行时间，BYHOUR=2，表示2点开始执行：
SQL> BEGIN
2 DBMS_SCHEDULER.SET_ATTRIBUTE(
3 name => '"SYS"."THURSDAY_WINDOW"',
4 attribute => 'REPEAT_INTERVAL',
5 value => 'freq=daily;byday=THU;byhour=10;byminute=40;bysecond=0');
6 END;
7 /
4.开启任务：
SQL> BEGIN
2 DBMS_SCHEDULER.ENABLE(
3 name => '"SYS"."THURSDAY_WINDOW"');
4 END;
5 /
5.查看修改后的情况：
SQL> select t1.window_name,t1.repeat_interval,t1.duration
2 from dba_scheduler_windows t1,dba_scheduler_wingroup_members t2
3 where t1.window_name=t2.window_name and t2.window_group_name in ('MAINTENANCE_WINDOW_GROUP','BSLN_MAINTAIN_STATS_SCHED');
来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/26506993/viewspace-1985476/，如需转载，请注明出处，否则将追究法律责任。