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在AWR中，如果有部分選項是：Nodata exists for this section of the report.那么屬正常現象。

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如：

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那么現在看一個有數據的AWR:

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在下面的這個圖中就顯示了顯示的條件：

（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

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只有達到條件的情況下，才會顯示該項的數據。所以如果出現No data exists for this section of the report.就說明還沒達到條件。

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如果說不是局部選項，而是全部都是No data exists for this section of the report，那么AWR的相關參數設置可能就有問題。

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在Oracle 10g和11g 都有的參數：statistics_level，如果該參數設置為BASIC，那么會禁用如下功能：

(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

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該參數默認是typical：

SYS> show parameter statistics

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NAME???????????????????????????????? TYPE??????? VALUE

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

statistics_level???????????????????? string????? TYPICAL

timed_os_statistics????????????????? integer???? 0

timed_statistics???????????????????? boolean???? TRUE

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詳見我的Blog：

Oracle AWR 介紹

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

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使用如下SQL 查看相關的設置：

/* Formatted on 2011/12/1610:30:17 (QP5 v5.185.11230.41888) */ SELECTstatistics_name, session_status, system_status, activation_level, session_settable FROM v$statistics_level ORDER BY statistics_name;

在Oracle 11g 下，多了一個CONTROL_MANAGEMENT_PACK_ACCESS參數，該參數可以影響AWR信息的收集：

SQL> show parameter CONTROL_MANAGEMENT_PACK_ACCESS

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NAME???????????????????????????????? TYPE??????? VALUE

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

control_management_pack_access?????? string????? DIAGNOSTIC+TUNING

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對企業版的默認值是DIAGNOSTIC+TUNING，如上所示。

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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

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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.

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對這個參數的解釋，參考：

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

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如果在Oracle 11g里該參數不正確，也會影響AWR等信息的收集，可以通過如下語句修改：

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

System altered.

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小結：

1.?????如果部分選項出現No data exists for this section of the report.屬正常現象。

2.?????如果全部出現，則需要檢查相關參數10g中檢查statistics_level，11g中檢查statistics_level和control_management_pack_access參數。

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轉載于:https://www.cnblogs.com/zlja/archive/2011/12/16/2449510.html

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