Oracle AWR 报告中 No data exists for this section of the report 说明

 

在AWR中,如果有部分选项是:Nodata exists for this section of the report.那么属正常现象。

 

如:

 Oracle AWR 报告中 No data exists for this section of the report 说明_第1张图片


那么现在看一个有数据的AWR:

Oracle AWR 报告中 No data exists for this section of the report 说明_第2张图片

 

在下面的这个图中就显示了显示的条件:

(1)SQL orderedby Sharable Memory:Only Statements with Sharable Memory greater than 1048576 are displayed

(2)SQL orderedby Version Count:Only Statements with Version Count greater than 20 are displayed

 

只有达到条件的情况下,才会显示该项的数据。所以如果出现No data exists for this section of the report.就说明还没达到条件。

 

如果说不是局部选项,而是全部都是No data exists for this section of the report,那么AWR的相关参数设置可能就有问题。

 

在Oracle 10g和11g 都有的参数:statistics_level,如果该参数设置为BASIC,那么会禁用如下功能:

(1)    Automatic Workload Repository(AWR) Snapshots

(2)    Automatic Database DiagnosticMonitor (ADDM)

(3)    All server-generated alerts

(4)    Automatic SGA Memory Management

(5)    Automatic optimizer statisticscollection

(6)    Object level statistics

(7)    End to End Application Tracing(V$CLIENT_STATS)

(8)    Database time distributionstatistics (V$SESS_TIME_MODEL and V$SYS_TIME_MODEL)

(9)    Service level statistics

(10) Buffer cache advisory

(11) MTTR advisory

(12) Shared pool sizing advisory

(13) Segment level statistics

(14) PGA Target advisory

(15) Timed statistics

(16) Monitoring of statistics

 

该参数默认是typical:

SYS> show parameter statistics

 

NAME                                 TYPE        VALUE

----------------------------------------------- ------------------------------

statistics_level                     string      TYPICAL

timed_os_statistics                  integer     0

timed_statistics                     boolean     TRUE

 

详见我的Blog:

Oracle AWR 介绍

http://blog.csdn.net/tianlesoftware/article/details/4682300

 

使用如下SQL 查看相关的设置:

Oracle AWR 报告中 No data exists for this section of the report 说明_第3张图片


在Oracle 11g 下,多了一个CONTROL_MANAGEMENT_PACK_ACCESS参数,该参数可以影响AWR信息的收集:

SQL> show parameter CONTROL_MANAGEMENT_PACK_ACCESS

 

NAME                                 TYPE        VALUE

----------------------------------------------- ----------------------

control_management_pack_access       string      DIAGNOSTIC+TUNING

 

对企业版的默认值是DIAGNOSTIC+TUNING,如上所示。

 

Property

Description

Parameter type

String

Syntax

CONTROL_MANAGEMENT_PACK_ACCESS = { NONE | DIAGNOSTIC | DIAGNOSTIC+TUNING }

Default value

Enterprise Edition: DIAGNOSTIC+TUNING

All other editions: NONE

Modifiable

ALTER SYSTEM

Basic

No

 

CONTROL_MANAGEMENT_PACK_ACCESS specifieswhich of the Server Manageability Packs should be active. The following packsare available:

  • The DIAGNOSTIC pack includes AWR, ADDM, and so on.
  • The TUNING pack includes SQL Tuning Advisor, SQLAccess Advisor, and so on.

A license for DIAGNOSTIC is required for enabling the TUNING pack.

 

对这个参数的解释,参考:

http://docs.oracle.com/cd/E11882_01/server.112/e25513/initparams037.htm#REFRN10296

 

如果在Oracle 11g里该参数不正确,也会影响AWR等信息的收集,可以通过如下语句修改:

SQL>alter system set control_management_pack_access='DIAGNOSTIC+TUNING' scope=both;

System altered.

 


小结:

1.     如果部分选项出现No data exists for this section of the report.属正常现象。

2.     如果全部出现,则需要检查相关参数10g中检查statistics_level,11g中检查statistics_level和control_management_pack_access参数。

 

 

 

 

 

 

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