在一次生成AWR報告中，發現在“Instances in this Workload Repository schema”部分，出現了多個實例記錄信息（host敏感信息被用host1,host2,host3替換）。具體信息如下截圖所示： SQL> @?/rdbms/admin/awrrpt Curr... ...
在一次生成AWR報告中，發現在“Instances in this Workload Repository schema”部分，出現了多個實例記錄信息（host敏感信息被用host1,host2,host3替換）。具體信息如下截圖所示：
SQL> @?/rdbms/admin/awrrpt
Current Instance~~~~~~~~~~~~~~~~
DB Id DB Name Inst Num Instance
----------- ------------ -------- ------------ 3990839260 SCM2 1 SCM2Specify 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: html
Type Specified: html
Instances in this Workload Repository schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DB Id Inst Num DB Name Instance Host------------ -------- ------------ ------------ ------------ 3990839260 1 SCM2 SCM2 host1* 3990839260 1 SCM2 SCM2 host2
3990839260 1 SCM2 SCM2 host3
Using 3990839260 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.
其實這幾個Host對於我來說，非常熟悉，一個是資料庫遷移前的hostname，一個是hostname修改前的名稱，一個是hostname修改後的名稱。那麼為什麼出現這個情況呢？我們先從$ORACLE_HOME/rdbms/admin/awrrpt.sql腳本開始，看看這些記錄是怎麼獲取的。
[oracle@MyOracle admin]$ more awrrpt.sql
Rem $Header: awrrpt.sql 24-oct-2003.12:04:53 pbelknap Exp $Rem
Rem awrrpt.sqlRem
Rem Copyright (c) 1999, 2003, Oracle Corporation. All rights reserved. Rem
Rem NAME
Rem awrrpt.sqlRem
Rem DESCRIPTION
Rem This script defaults the dbid and instance number to that of the
Rem current instance connected-to, then calls awrrpti.sql to produce
Rem the Workload Repository report.
Rem
Rem NOTES
Rem Run as select_catalog privileges.
Rem This report is based on the Statspack report.
Rem
Rem If you want to use this script in an non-interactive fashion,
Rem see the 'customer-customizable report settings' section in
Rem awrrpti.sqlRem
Rem MODIFIED (MM/DD/YY)
Rem pbelknap 10/24/03 - swrfrpt to awrrpt Rem pbelknap 10/14/03 - moving params to rpti Rem pbelknap 10/02/03 - adding non-interactive mode cmnts
Rem mlfeng 09/10/03 - heading on Rem aime 04/25/03 - aime_going_to_main
Rem mlfeng 01/27/03 - mlfeng_swrf_reporting
Rem mlfeng 01/13/03 - Update commentsRem mlfeng 07/08/02 - swrf flushing
Rem mlfeng 06/12/02 - Created
Rem
---- Get the current database/instance information - this will be used -- later in the report along with bid, eid to lookup snapshots
set echo off heading on underline on;
column inst_num heading "Inst Num" new_value inst_num format 99999;column inst_name heading "Instance" new_value inst_name format a12;column db_name heading "DB Name" new_value db_name format a12;column dbid heading "DB Id" new_value dbid format 9999999999 just c;prompt
prompt Current Instanceprompt ~~~~~~~~~~~~~~~~
select d.dbid dbid, d.name db_name
, i.instance_number inst_num
, i.instance_name inst_name
from v$database d,
v$instance i;
@@awrrpti
undefine num_days;
undefine report_type;
undefine report_name;
undefine begin_snap;
undefine end_snap;
--
-- End of file
如上所示，其實awrrpt.sql裡面沒有多少料，主要功能還是在awrrpti.sql中實現的。在awrrpti.sql裡面，看到通過下麵部分信息，定位到AWR裡面的信息來源於awrinput.sql
檢查awrinput.sql腳本，發現AWR那段數據來自於下麵SQL語句
---- Request the DB Id and Instance Number, if they are not specifiedcolumn instt_num heading "Inst Num" format 99999;column instt_name heading "Instance" format a12;column dbb_name heading "DB Name" format a12;column dbbid heading "DB Id" format a12 just c;column host heading "Host" format a12;
prompt
prompt
prompt Instances in this Workload Repository schema
prompt ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
select distinct
(case when cd.dbid = wr.dbid and
cd.name = wr.db_name and ci.instance_number = wr.instance_number and ci.instance_name = wr.instance_name and
