AWR信息报告
AWR报告是我们研究分析Oracle性能,特别是应用程序工作特性的重要工具手段。进入10g之后,随着CBO的推广、自动作业机制的确立,越
AWR报告是我们研究分析Oracle性能,特别是应用程序工作特性的重要工具手段。进入10g之后,随着CBO的推广、自动作业机制的确立,越来越多的运维人员乃至开发人员将AWR作为分析性能的工具。
除了AWR报告本身,Oracle还提供了一些AWR相关的脚本,用于进行辅助操作。本篇主要介绍awr Info脚本。
1、环境介绍
本篇使用Oracle 11gR2进行实验,具体版本为11.2.0.4。
[oracle@SICS-MIGPC-DB ~]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.4.0 Production on Sat Oct 10 08:52:31 2015
Copyright (c) 1982, 2013, Oracle. All rights reserved.
SQL> conn / as sysdba
Connected.
SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE 11.2.0.4.0 Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 – Production
2、脚本执行
执行的生成脚本是在Oracle客户端。为避免由于版本原因带来的差异问题,笔者建议最好是在Oracle服务器端生成文件。
[oracle@SICS-MIGPC-DB ~]$ sqlplus /nolog
SQL*Plus: Release 11.2.0.4.0 Production on Sat Oct 10 09:16:45 2015
Copyright (c) 1982, 2013, Oracle. All rights reserved.
SQL> conn / as sysdba
Connected.
SQL> @?/rdbms/admin/awrinfo.sql
之后要求输入报告名称。
This script will report general AWR information
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Specify the Report File Name
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The default report file name is awrinfo.txt. To use this name,
press
Enter value for report_name:
最后会自动输出信息:
(若干输出)
(2b) ASH details (past 1 day)
**********************************
INST MIN_TIME MAX_TIME NUM_SAMPLES NUM_ROWS AVG_ACTIVE
---- ---------------- ---------------- ------------ ------------ ----------
1 10:10:12 (10/09) 08:49:19 (10/10) 8,145 1,604 0.20
**********************************
(2c) ASH sessions (Fg Vs Bg) (past 1 day across all instances in RAC)
**********************************
Foreground % 90.0
Background % 10.0
MMNL % 0.0
End of Report
Report written to awrinfo.txt
在当前目录下,会看到awrinfo.txt文件。下面会分部分进行解析:
3、结果解析
下面分为若干部分进行结果说明。
第一部分:报告信息说明。抽取出AWR配置信息和保留自动删除信息。
~~~~~~~~~~~~~~~
AWR INFO Report
~~~~~~~~~~~~~~~
Report generated at
09:18:28 on Oct 10, 2015 ( Saturday ) in Timezone +08:00
Warning: Non Default AWR Setting!
--------------------------------------------------------------------------------
Snapshot interval is 60 minutes and Retention is 8 days
DB_ID DB_NAME HOST_PLATFORM INST STARTUP_TIME LAST_ASH_SID PAR
------------ --------- ---------------------------------------- ----- ----------------- ------------ ---
* 2746051042 SICSDB SICS-MIGPC-DB - Linux x86 64-bit 1 10:28:41 (01/08) 23726128 NO
第二部分:AWR镜像snapshot信息。依据规则,每次snapshot记录是保存在sysaux表空间里面的。经常会遇到SYSAUX不断增大超过限制的问题,一般都是由于AWR Purge引起的问题。
########################################################
(I) AWR Snapshots Information
########################################################
*****************************************************
(1a) SYSAUX usage - Schema breakdown (dba_segments)
*****************************************************
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