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标题: awr报告时间间隔解析 [打印本页]

作者: denglj 时间: 2022-1-17 14:06
标题: awr报告时间间隔解析
本帖最后由 denglj 于 2022-1-17 14:07 编辑

在进行数据库性能分析时，往往需要取出最近一段时间的awr报告。
众所周知，awr报告默认情况是每隔一个小时产生一个，
那么怎么修改awr报告的间隔时间呢？
以下为实际演练过程：
查询当前awr报告间隔时间，如下SNAP_INTERVAL为1小时
SQL> select * from dba_hist_wr_control

   DBID SNAP_INTERVAL                RETENTION                   TOPNSQL       CON_ID SRC_DBID SRC_DBNAME
---------- ------------------------------ ------------------------------ ---------- ---------- ---------- ------------------------------
2860573172 +00000 01:00:00.0             +00008 00:00:00.0             DEFAULT          0 2860573172 CDB$ROOT

SQL> select dbid,snap_interval,snapint_num,retention from wrm$_wr_control;

   DBID SNAP_INTERVAL                SNAPINT_NUM RETENTION
---------- ------------------------------ ----------- ------------------------------
2860573172 +00000 01:00:00.0                   3600 +00008 00:00:00.0

修改间隔时间为30分钟，保留时间8*24*60(8天*24小时*60分钟)不变
SQL> exec dbms_workload_repository.modify_snapshot_settings(interval=>30,retention=>8*24*60);

PL/SQL procedure successfully completed.

确认SNAP_INTERVAL修改状况
SQL> select * from dba_hist_wr_control

   DBID SNAP_INTERVAL                RETENTION                   TOPNSQL       CON_ID SRC_DBID SRC_DBNAME
---------- ------------------------------ ------------------------------ ---------- ---------- ---------- ------------------------------
2860573172 +00000 00:30:00.0             +00008 00:00:00.0             DEFAULT          0 2860573172 CDB$ROOT

执行awrrpt.sql验证：
SQL> @?/rdbms/admin/awrrpt.sql

Specify the Report Type
~~~~~~~~~~~~~~~~~~~~~~~
AWR reports can be generated in the following formats.  Please enter the
name of the format at the prompt.  Default value is 'html'.

'html'       HTML format (default)
'text'       Text format
'active-html' Includes Performance Hub active report

Enter value for report_type:
old 1: select 'Type Specified: ',lower(nvl('&&report_type','html')) report_type from dual
new 1: select 'Type Specified: ',lower(nvl('','html')) report_type from dual

Type Specified:  html

old 1: select '&&report_type' report_type_def from dual
new 1: select 'html' report_type_def from dual

old 1: select '&&view_loc' view_loc_def from dual
new 1: select 'AWR_PDB' view_loc_def from dual

Current Instance
~~~~~~~~~~~~~~~~
DB Id       DB Name       Inst Num    Instance    Container Name
-------------- -------------- -------------- -------------- --------------
2860573172    ORCLCDB                   1 orclcdb       CDB$ROOT

Instances in this Workload Repository schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  DB Id    Inst Num DB Name    Instance    Host
------------ ---------- --------- ---------- ------
* 2860573172    1    ORCLCDB    orclcdb    dbserver

Using 2860573172 for database Id
Using       1 for instance number

Specify the number of days of snapshots to choose from
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Entering the number of days (n) will result in the most recent
(n) days of snapshots being listed.  Pressing <return> without
specifying a number lists all completed snapshots.

Enter value for num_days:

Listing all Completed Snapshots
Instance    DB Name    Snap Id    Snap Started Snap Level
------------ ------------ ---------- ------------------ ----------
orclcdb    ORCLCDB          26  09 Jan 2022 15:56 1
                                          27  09 Jan 2022 17:00 1
                                          28  09 Jan 2022 18:00 1
                                          29  09 Jan 2022 19:00 1
                                          30  09 Jan 2022 20:00 1
                                          31  09 Jan 2022 21:00 1
                                          32  09 Jan 2022 22:00 1
                                          33  13 Jan 2022 23:00 1
                                          34  13 Jan 2022 09:00 1
                                          35  13 Jan 2022 09:21 1
Specify the Begin and End Snapshot Ids
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enter value for begin_snap: 34
Begin Snapshot Id specified: 34

Enter value for end_snap: 35
End Snapshot Id specified: 35
...
此时就能取出不是非整点的awr报告，取完后记得将间隔时间修改回1小时。

其实，此处要取出9点到当前时间点的awr报告，还可以在当前时间点创建一个快照，如下：
exec dbms_workload_repository.create_snapshot();
此后执行命令@?/rdbms/admin/awrrpt.sql 就会出现最近一个快照的Snap Id提供选择。

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