AWR管理-优快云博客

通过DBMS_WORKLOAD_REPOSITORY包，可以对AWR进行基本的管理。在默认的情况下，oracle是每一小时采集一次快照，下面简要介绍一下手动管理：

1.手动创建快照：

SQL> /

   SNAP_ID       DBID BEGIN_INTERVAL_TIME            END_INTERVAL_TIME
---------- ---------- ------------------------------ ------------------------------
         1 2168572286 12-DEC-08 08.32.41.000 PM      12-DEC-08 09.00.49.645 PM
         3 2168572286 12-DEC-08 10.00.51.498 PM      12-DEC-08 11.00.53.571 PM
         2 2168572286 12-DEC-08 09.00.49.645 PM      12-DEC-08 10.00.51.498 PM
         4 2168572286 13-DEC-08 04.45.19.000 AM      13-DEC-08 04.51.49.972 AM
         5 2168572286 13-DEC-08 04.51.49.972 AM      13-DEC-08 05.30.28.483 AM
         6 2168572286 13-DEC-08 05.30.28.483 AM      13-DEC-08 06.00.29.593 AM

6 rows selected.

SQL> BEGIN
DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT ();
END;
/
2    3    4

PL/SQL procedure successfully completed.

SQL> a order by 1
1* select snap_id,dbid,BEGIN_INTERVAL_TIME,END_INTERVAL_TIME from dba_hist_snapshot order by 1
SQL> /

   SNAP_ID       DBID BEGIN_INTERVAL_TIME            END_INTERVAL_TIME
---------- ---------- ------------------------------ ------------------------------
         1 2168572286 12-DEC-08 08.32.41.000 PM      12-DEC-08 09.00.49.645 PM
         2 2168572286 12-DEC-08 09.00.49.645 PM      12-DEC-08 10.00.51.498 PM
         3 2168572286 12-DEC-08 10.00.51.498 PM      12-DEC-08 11.00.53.571 PM
         4 2168572286 13-DEC-08 04.45.19.000 AM      13-DEC-08 04.51.49.972 AM
         5 2168572286 13-DEC-08 04.51.49.972 AM      13-DEC-08 05.30.28.483 AM
         6 2168572286 13-DEC-08 05.30.28.483 AM      13-DEC-08 06.00.29.593 AM
         7 2168572286 14-DEC-08 04.10.24.000 PM      14-DEC-08 04.21.31.407 PM
         8 2168572286 14-DEC-08 04.21.31.407 PM      14-DEC-08 04.27.46.179 PM

8 rows selected.

2.删除快照，可以指定一个快照的范围进行删除。

SQL> BEGIN
DBMS_WORKLOAD_REPOSITORY.DROP_SNAPSHOT_RANGE (low_snap_id => 2,
                           high_snap_id => 3);
END;
/
2    3    4    5

PL/SQL procedure successfully completed.

SQL> SQL> select snap_id,dbid,BEGIN_INTERVAL_TIME,END_INTERVAL_TIME from dba_hist_snapshot order by 1;

   SNAP_ID       DBID BEGIN_INTERVAL_TIME            END_INTERVAL_TIME
---------- ---------- ------------------------------ ------------------------------
         1 2168572286 12-DEC-08 08.32.41.000 PM      12-DEC-08 09.00.49.645 PM
         4 2168572286 13-DEC-08 04.45.19.000 AM      13-DEC-08 04.51.49.972 AM
         5 2168572286 13-DEC-08 04.51.49.972 AM      13-DEC-08 05.30.28.483 AM
         6 2168572286 13-DEC-08 05.30.28.483 AM      13-DEC-08 06.00.29.593 AM
         7 2168572286 14-DEC-08 04.10.24.000 PM      14-DEC-08 04.21.31.407 PM
         8 2168572286 14-DEC-08 04.21.31.407 PM      14-DEC-08 04.27.46.179 PM

6 rows selected.

3.修改快照设置。可以更改快照自动产生的时间间隔和快照保留时间

SQL> BEGIN
DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS( retention => 43200,
interval => 30);
END;
/ 2 3 4 5

PL/SQL procedure successfully completed.

4.创建和删除baseline。baseline就是保留一个典型的时间段内(业务高峰期）的快照，用作性能基准，在以后出现性能问题时，可以进行对比。

创建：

SQL> BEGIN
    DBMS_WORKLOAD_REPOSITORY.CREATE_BASELINE (start_snap_id => 6,
                   end_snap_id => 8, baseline_name => 'peak baseline');
END;
/ 2    3    4    5

PL/SQL procedure successfully completed.

删除：

SQL> BEGIN
DBMS_WORKLOAD_REPOSITORY.DROP_BASELINE (baseline_name => 'peak baseline',
cascade => FALSE);
END;
/ 2 3 4 5

PL/SQL procedure successfully completed.

5.查看awr报告

SQL> @$ORACLE_HOME/rdbms/admin/awrrpt.sql

Current Instance
~~~~~~~~~~~~~~~~

   DB Id    DB Name      Inst Num Instance
----------- ------------ -------- ------------
2168572286 EBANK               1 ebank

Specify the Report Type
~~~~~~~~~~~~~~~~~~~~~~~
Would you like an HTML report, or a plain text report?
Enter 'html' for an HTML report, or 'text' for plain text
Defaults to 'html'
Enter value for report_type:

Type Specified: html

Instances in this Workload Repository schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

   DB Id     Inst Num DB Name      Instance     Host
------------ -------- ------------ ------------ ------------
* 2168572286        1 EBANK        ebank        localhost.lo
                                                caldomain

Using 2168572286 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 without
specifying a number lists all completed snapshots.

Enter value for num_days: 1

Listing the last day's Completed Snapshots

                                                        Snap
Instance     DB Name        Snap Id    Snap Started    Level
------------ ------------ --------- ------------------ -----
ebank        EBANK                7 14 Dec 2008 16:21      1
                                  8 14 Dec 2008 16:27      1

Specify the Begin and End Snapshot Ids
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enter value for begin_snap: 7
Begin Snapshot Id specified: 7

Enter value for end_snap: 8
End   Snapshot Id specified: 8

Specify the Report Name
~~~~~~~~~~~~~~~~~~~~~~~
The default report file name is awrrpt_1_7_8.html. To use this name,
press to continue, otherwise enter an alternative.

Enter value for report_name: