AWR (Automatic Workload Repository) Report

10g引入AWR(Automatic Workload Repository),一个新的性能采集和分析工具。 (10g以前使用statspack)

AWR可以收集的信息有：

• Wait events used to identify performance problems.
• Time model statistics indicating the amount of DB time associated with a process from the V$SESS_TIME_MODEL and V$SYS_TIME_MODEL views.
• Active Session History (ASH) statistics from the V$ACTIVE_SESSION_HISTORY view.
• Some system and session statistics from the V$SYSSTAT and V$SESSTAT views.
• Object usage statistics.
• Resource intensive SQL statements.

AWR使用快照(Snapshots)的概念来设定性能收集的范围。快照（Snapshots），在特定时间捕获的一组性能统计信息，用于计算统计信息的更改率。每个快照由snap_id进行标识。默认快照每60分钟生成一次，并且这个会保留7天。

如何生成AWR Report

sqlplus /nolog
conn system/xxx

(需使用sys/system用户来执行脚本)
@$ORACLE_HOME/rdbms/admin/awrrpt.sql
参数1：

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

参数2：

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: 1

参数3：

Listing the last day's Completed Snapshots

Instance     DB Name        Snap Id    Snap Started    Level
------------ ------------ --------- ------------------ -----
mc3yd213     MC3YD213          4653 17 Dec 2012 00:00      1
                                              4654 17 Dec 2012 01:00      1
                                             4655 17 Dec 2012 02:00      1



Specify the Begin and End Snapshot Ids
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enter value for begin_snap: 4653
Begin Snapshot Id specified: 4653

Enter value for end_snap: 4654
End   Snapshot Id specified: 4654

参数4：

Specify the Report Name
~~~~~~~~~~~~~~~~~~~~~~~
The default report file name is awrrpt_1_4653_4654.html.  To use this name,
press <return> to continue, otherwise enter an alternative.

Enter value for report_name:xxx.html

AWR Report Demo

Link

How to Read AWR report

reference1:http://www.oracle-base.com/articles/10g/automatic-workload-repository-10g.php#reading-awr-reports

Reference

http://www.oracle-base.com/articles/10g/automatic-workload-repository-10g.php

Automatic Workload Repository (AWR) Reports - Start Point (Doc ID 1363422.1)

AWR Overview
Document 276103.1 PERFORMANCE TUNING USING 10g ADVISORS AND MANAGEABILITY FEATURES

Assuming you have the appropriate licenses for AWR, you may gather and examine Automatic Workload Repository (AWR) reports for the system.

Document 1490798.1 AWR Reporting - Licensing Requirements Clarification

Without the appropriate licenses, Statspack provides a legacy solution:

Document 94224.1 FAQ- Statspack Complete Reference

Collecting AWR reports

Document 748642.1 How to Generate an AWR Report and Create Baselines

AWR Interpretation

Document 1359094.1 FAQ: How to Use AWR reports to Diagnose Database Performance Issues
Document 786554.1 How to Read PGA Memory Advisory Section in AWR and Statspack Reports
Document 754639.1 How to Read Buffer Cache Advisory Section in AWR and Statspack Reports.
Document 762526.1 How to Interpret the OS stats section of an AWR report
Document 1466035.1 How to Interpret the "SQL ordered by Physical Reads (UnOptimized)" Section in AWR Reports (11.2 onwards)

AWR setup and Troubleshooting setup Issues

This section covers the setup of AWR and troubleshooting of problems related to that:

AWR Setup

Document 782974.1 How to Recreate The AWR ( AUTOMATIC WORKLOAD ) Repository ?

AWR Troubleshooting

Document 1301503.1 Troubleshooting: AWR Snapshot Collection issues
Document 296765.1 Solutions for possible AWR Library Cache Latch Contention Issues in Oracle 10g
Document 560204.1 MMON TRACE SHOWS KEWRAFC: FLUSH SLAVE FAILED, AWR ENQUEUE TIMEOUT

AWR Storage Management

Document 287679.1 Space Management In Sysaux Tablespace with AWR in Use
Document 329984.1 Usage and Storage Management of SYSAUX tablespace occupants SM/AWR, SM/ADVISOR, SM/OPTSTAT and SM/OTHER

Common Issues

Document 459887.1 ORA-13516 AWR Operation failed: SWRF Schema not initialized ORA-06512 SYS.DBMS_WORKLOAD_REPOSITORY

If awrinfo.sql hangs, use following script:

Document 733655.1 AWR diagnostic collection script