Oracle 11g修改AWR数据采样时间间隔及历史快照保留时间-CFANZ编程社区

SQL> col SNAP_INTERVAL for a20

SQL> col RETENTION for a20

SQL> select * from dba_hist_wr_control;

DBID SNAP_INTERVAL RETENTION TOPNSQL

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

890208719 +00000 01:00:00.0 +00008 00:00:00.0 DEFAULT

SNAP_INTERVAL=+00000 01:00:00.0 表示采样间隔是1小时

RETENTION=+00008 00:00:00.0 表示采样数据保留期限是8天

关于DBA_HIST_WR_CONTROL视图的更多参考可参见Oracle官方文档

http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_3202.htm#REFRN23462

SQL> select DBID, SNAP_INTERVAL, SNAPINT_NUM, RETENTION from wrm$_wr_control;

DBID SNAP_INTERVAL SNAPINT_NUM RETENTION

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

890208719 +00000 01:00:00.0 3600 +00008 00:00:00.0

SQL> select dbms_stats.get_stats_history_retention from dual;

GET_STATS_HISTORY_RETENTION

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

SQL> execute dbms_workload_repository.modify_snapshot_settings(interval => 60,retention => 20160);

PL/SQL procedure successfully completed.

修改采样间隔为1小时。

修改采样数据保留期限为14天。 60*24*14=20160。

SQL> select * from dba_hist_wr_control;

DBID SNAP_INTERVAL RETENTION TOPNSQL

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

890208719 +00000 01:00:00.0 +00014 00:00:00.0 DEFAULT

SQL> execute dbms_workload_repository.modify_snapshot_settings(interval => 30,retention => 23040);

PL/SQL procedure successfully completed.

修改采样间隔为30分钟。

修改采样数据保留期限为16天。 60*24*16=23040。

SQL> select * from dba_hist_wr_control;

DBID SNAP_INTERVAL RETENTION TOPNSQL

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

890208719 +00000 01:00:00.0 +00016 00:00:00.0 DEFAULT

例如我们需要将采集间隔调整为15分钟，采样数据保留2天，可以做如下调整

sys@ora10g> BEGIN

2 DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS(

3 interval => 15,

4 retention => 2*24*60);

5 END;

6 /

PL/SQL procedure successfully completed.

更多关于该存储过程的说明请参考Oracle官方文档

https://docs.oracle.com/cd/B19306_01/appdev.102/b14258/d_wkrpos.htm#BACEHJJI