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MSSQL 2008: 收集 Buffer Cache Hit Ratio

Microsoft.SQLServer.2008.BufferCacheHitRatio (Rule)

收集每个 SQL 2008 数据库引擎实例的 Windows "Buffer Cache Hit Ratio" 性能计数器。

Knowledge Base article:

摘要

在缓冲区高速缓存中找到而不需要从磁盘中读取的页的百分比。该比率是缓存命中总次数与过去几千页访问以来的缓存查找总次数之比。经过很长时间后，该比率的变化很小。由于从缓存中读取数据比从磁盘中读取数据的开销小得多，一般希望该比率高一些。通常，可以通过增加 SQL Server 的可用内存量来提高缓冲区缓存命中率。

Element properties:

TargetMicrosoft.SQLServer.2008.DBEngine
CategoryPerformanceCollection
EnabledTrue
Instance Name$Target/Property[Type="SQL!Microsoft.SQLServer.DBEngine"]/PerformanceCounterObject$:Buffer Manager
Counter NameBuffer cache hit ratio
Frequency900
Alert GenerateFalse
RemotableTrue

Member Modules:

ID Module Type TypeId RunAs 
DS DataSource System.Performance.DataProvider Microsoft.SQLServer.SQLDefaultAccount
PerfMapper ConditionDetection System.Performance.DataGenericMapper Default
WriteToDB WriteAction Microsoft.SystemCenter.CollectPerformanceData Default
WriteToDW WriteAction Microsoft.SystemCenter.DataWarehouse.PublishPerformanceData Default

Source Code:

<Rule ID="Microsoft.SQLServer.2008.BufferCacheHitRatio" Enabled="true" Target="SQL2008Core!Microsoft.SQLServer.2008.DBEngine">

  <Category>PerformanceCollection</Category>

  <DataSources>

    <DataSource ID="DS" TypeID="SystemPerf!System.Performance.DataProvider" RunAs="SQL!Microsoft.SQLServer.SQLDefaultAccount">

      <ComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ComputerName>

      <CounterName>Buffer cache hit ratio</CounterName>

      <ObjectName>$Target/Property[Type="SQL!Microsoft.SQLServer.DBEngine"]/PerformanceCounterObject$:Buffer Manager</ObjectName>

      <InstanceName/>

      <AllInstances>false</AllInstances>

      <Frequency>900</Frequency>

    </DataSource>

  </DataSources>

  <ConditionDetection ID="PerfMapper" TypeID="SystemPerf!System.Performance.DataGenericMapper">

    <ObjectName>SQL DB Engine:Buffer Manager</ObjectName>

    <CounterName>$Data/CounterName$</CounterName>

    <InstanceName/>

    <Value>$Data/Value$</Value>

  </ConditionDetection>

  <WriteActions>

    <WriteAction ID="WriteToDB" TypeID="SC!Microsoft.SystemCenter.CollectPerformanceData"/>

    <WriteAction ID="WriteToDW" TypeID="SCDW!Microsoft.SystemCenter.DataWarehouse.PublishPerformanceData"/>

  </WriteActions>

</Rule>