一、查看取值间隔

SQL> select * from dba_hist_wr_control;

DBID SNAP_INTERVAL RETENTION TOPNSQL

---------- ------------------------------ ------------------------------ ----------

1549435079 +00000 01:00:00.0 +00008 00:00:00.0 DEFAULT

二、修改采集间隔和保留时间

修改采集间隔为1小时,保留时间是3天

SQL> BEGIN

DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS(

interval => 60,

retention => 3*24*60);

END;

/

报错：

ERROR at line 1:

ORA-13541: system moving window baseline size (604800) greater than retention (259200)

ORA-06512: at "SYS.DBMS_WORKLOAD_REPOSITORY", line 174

ORA-06512: at "SYS.DBMS_WORKLOAD_REPOSITORY", line 222

ORA-06512: at line 2

报错解决办法,修改基数值

SQL> SELECT dbid, baseline_name, baseline_type, moving_window_size from dba_hist_baseline;

DBID BASELINE_NAME BASELINE_TYPE MOVING_WINDOW_SIZE

------------------------------ ---------------------

2510643529 SYSTEM_MOVING_WINDOW MOVING_WINDOW 8

当前的基数值为8,这里我们修改成7(基数值必须小于或等于AWR快照所设置的保留值)

修改基数值:

SQL> exec DBMS_WORKLOAD_REPOSITORY.MODIFY_BASELINE_WINDOW_SIZE(7)

再次执行:

SQL> BEGIN

2 DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS(

3 interval => 60,

4 retention => 3*24*60);

5 END;

6 /

PL/SQL procedure successfully completed.

三、查看修改结果

SQL> select * from dba_hist_wr_control;

DBID SNAP_INTERVAL RETENTION TOPNSQL

------------------------------ -------------------- -------------------- ------------------------------

2510643529 +00000 01:00:00.0 +00003 00:00:00.0 DEFAULT