Oracle 修改统计信息时间Gather_stats

1. 查看当前统计信息收集时间
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 in ('MAINTENANCE_WINDOW_GROUP','BSLN_MAINTAIN_STATS_SCHED');

1 MONDAY_WINDOW freq=daily;byday=MON;byhour=22;byminute=0; bysecond=0 +000 04:00:00
2 TUESDAY_WINDOW freq=daily;byday=TUE;byhour=22;byminute=0; bysecond=0 +000 04:00:00
3 WEDNESDAY_WINDOW freq=daily;byday=WED;byhour=22;byminute=0; bysecond=0 +000 04:00:00
4 THURSDAY_WINDOW freq=daily;byday=THU;byhour=22;byminute=0; bysecond=0 +000 04:00:00
5 FRIDAY_WINDOW freq=daily;byday=FRI;byhour=22;byminute=0; bysecond=0 +000 04:00:00
6 SATURDAY_WINDOW freq=daily;byday=SAT;byhour=6;byminute=0; bysecond=0 +000 20:00:00
7 SUNDAY_WINDOW freq=daily;byday=SUN;byhour=6;byminute=0; bysecond=0 +000 20:00:00

2. 调整统计信息收集时间：

BEGIN
  DBMS_SCHEDULER.DISABLE(
  name => '"SYS"."MONDAY_WINDOW"',
  force => TRUE);
END;
/

BEGIN
  DBMS_SCHEDULER.SET_ATTRIBUTE(
  name => '"SYS"."MONDAY_WINDOW"',
  attribute => 'REPEAT_INTERVAL',
  value => 'freq=daily;byday=THU;byhour=22;byminute=0; bysecond=0 ');
END;
/

BEGIN
  DBMS_SCHEDULER.ENABLE(
  name => '"SYS"."MONDAY_WINDOW"');
END;

/

（此为修改持续时间：）

BEGIN
  DBMS_SCHEDULER.SET_ATTRIBUTE(
  name => '"SYS"."SATURDAY_WINDOW"',
  attribute => 'DURATION',
  value => numtodsinterval(240,'minute'));
END;  
/

3.再次查询统计信息执行时间：

  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 in ('MAINTENANCE_WINDOW_GROUP','BSLN_MAINTAIN_STATS_SCHED');