做AWR報告，啓動AWR，
SQL> @?/rdbms/admin/awrrpt;
Current Instance
~~~~~~~~~~~~~~~~
DB Id DB Name Inst Num Instance
----------- ------------ -------- ------------
2843528876 DEAN 1 dean
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: text
Type Specified: text
Instances in this Workload Repository schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DB Id Inst Num DB Name Instance Host
------------ -------- ------------ ------------ ------------
* 2843528876 1 DEAN dean CENTOS5.5
Using 2843528876 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: 2
Listing the last 2 days of Completed Snapshots
Snap
Instance DB Name Snap Id Snap Started Level
------------ ------------ --------- ------------------ -----
dean DEAN 80 18 Dec 2012 13:22 1
81 19 Dec 2012 14:55 1
82 19 Dec 2012 16:00 1
83 19 Dec 2012 17:00 1
Specify the Begin and End Snapshot Ids
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enter value for begin_snap: 80
Begin Snapshot Id specified: 80
Enter value for end_snap: 83
End Snapshot Id specified: 83
declare
*
ERROR at line 1:
ORA-20200: The instance was shutdown between snapshots 80 and 83
ORA-06512: at line 42
可以看到，選擇80——83這段是出錯，提示在這段裏有shutdown發生，注意看80段下一行是空的，查了資料，才知道原來這意思是這一段有數據庫重啓發生，所以AWR不能跨越空的段，隨後重新選擇81——83
成功顯示出AWR報告