修改AWR报告里面的topnsql 参数

视图： dba_hist_wr_control

修改awr相关参数，本次主要修改topnsql ，该值默认是30。

SYS@test>exec dbms_workload_repository.modify_snapshot_settings(topnsql => 100);

PL/SQL 过程已成功完成。

SYS@test>exec dbms_workload_repository.modify_snapshot_settings(topnsql => 10);
BEGIN dbms_workload_repository.modify_snapshot_settings(topnsql => 10); END;

*
第 1 行出现错误:
ORA-13530: TOPNSQL 10 无效, 必须在 (30, 50000) 范围内
ORA-06512: 在 "SYS.DBMS_WORKLOAD_REPOSITORY", line 174
ORA-06512: 在 "SYS.DBMS_WORKLOAD_REPOSITORY", line 222
ORA-06512: 在 line 1


SYS@test>exec dbms_workload_repository.modify_snapshot_settings(topnsql => 30);

PL/SQL 过程已成功完成。


SYS@test>exec dbms_workload_repository.modify_snapshot_settings(topnsql => 'DEFAULT');

PL/SQL 过程已成功完成。

SYS@test>

参考文档：

https://docs.oracle.com/cd/E11882_01/appdev.112/e40758/d_workload_repos.htm#ARPLS69140

Table 162-29 MODIFY_SNAPSHOT_SETTINGS Procedure Parameters

Parameter	Description
`retention`	New retention time (in minutes). The specified value must be in the range of `MIN_RETENTION` (1 day) to `MAX_RETENTION` (100 years). If `ZERO` is specified, snapshots will be retained forever. A large system-defined value will be used as the retention setting. If `NULL` is specified, the old value for retention is preserved. NOTE: The retention setting must be greater than or equal to the window size of the '`SYSTEM_MOVING_WINDOW`' baseline. If the retention needs to be less than the window size, the MODIFY_BASELINE_WINDOW_SIZE Procedure can be used to adjust the window size.
`interval`	New interval setting between each snapshot, in units of minutes. The specified value must be in the range `MIN_INTERVAL` (10 minutes) to `MAX_INTERVAL` (1 year). If `ZERO` is specified, automatic and manual snapshots will be disabled. A large system-defined value will be used as the retention setting. If `NULL` is specified, the current value is preserved.
`topnsql`	If `NUMBER`: Top N SQL size. The number of Top SQL to flush for each SQL criteria (Elapsed Time, CPU Time, Parse Calls, Shareable Memory, Version Count). The value for this setting will not be affected by the statistics/flush level and will override the system default behavior for the AWR SQL collection. The setting will have a minimum value of 30 and a maximum value of 50,000. Specifying `NULL` will keep the current setting. If `VARCHAR2`: Users are allowed to specify the following values: (`DEFAULT`, `MAXIMUM`, `N`), where `N` is the number of Top SQL to flush for each SQL criteria. Specifying `DEFAULT` will revert the system back to the default behavior of Top 30 for statistics level `TYPICAL` and Top 100 for statistics level `ALL`. Specifying `MAXIMUM` will cause the system to capture the complete set of SQL in the cursor cache. Specifying the number `N` is equivalent to setting the Top N SQL with the `NUMBER` type. Specifying `NULL` for this argument will keep the current setting.
`dbid`	Database identifier in AWR for which to modify the snapshot settings. If `NULL` is specified, the local dbid will be used. Defaults to `NULL`.

Examples

This example changes the interval setting to one hour and the retention setting to two weeks for the local database:

EXECUTE DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS(
  interval  =>  60,
  retention =>  20160);

If you query the DBA_HIST_WR_CONTROL table after this procedure is executed, you will see the changes to these settings.

END。

修改AWR报告里面的topnsql 参数

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