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SQL Re-Compilation

Microsoft.SQLServer.2012.DBEngine.SQLReCompilationMonitor (UnitMonitor)

SQL Re-Compilation for 2012 DB Engine

Knowledge Base article:

Summary

SQL Re-Compilation monitor for SQL 2012 DB Engine

Certain changes in a database can cause an execution plan to be either inefficient or invalid, based on the new state of the database. SQL Server detects the changes that invalidate an execution plan and marks the plan as not valid. A new plan must then be recompiled for the next connection that executes the query.

Causes

High number of recompilations comparing to compilations.

Resolutions

Start SQL Profiler and check SQL:StmtRecompile trace to identify root cause of issue.

Element properties:

TargetMicrosoft.SQLServer.2012.DBEngine
Parent MonitorSystem.Health.PerformanceState
CategoryPerformanceHealth
EnabledFalse
Alert GenerateTrue
Alert SeverityWarning
Alert PriorityNormal
Alert Auto ResolveTrue
Monitor TypeMicrosoft.SQLServer.2012.DBEngine.SQLReCompilation.MonitorType
RemotableTrue
AccessibilityPublic
Alert Message
SQL DB 2012 SQL Re-Compilation is too high
SQL instance "{0}" SQL Re-Compilation on computer "{1}" is too high. See "alert context" tab for more details.
RunAsDefault

Source Code:

<UnitMonitor ID="Microsoft.SQLServer.2012.DBEngine.SQLReCompilationMonitor" Accessibility="Public" Enabled="false" Target="SQL2012Core!Microsoft.SQLServer.2012.DBEngine" ParentMonitorID="SystemHealth!System.Health.PerformanceState" Remotable="true" Priority="Normal" TypeID="Microsoft.SQLServer.2012.DBEngine.SQLReCompilation.MonitorType" ConfirmDelivery="false">

  <Category>PerformanceHealth</Category>

  <AlertSettings AlertMessage="Microsoft.SQLServer.2012.DBEngine.SQLReCompilationMonitor.AlertMessage">

    <AlertOnState>Warning</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>Warning</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Target/Property[Type="SQL!Microsoft.SQLServer.ServerRole"]/InstanceName$</AlertParameter1>

      <AlertParameter2>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</AlertParameter2>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState ID="Normal" MonitorTypeStateID="Normal" HealthState="Success"/>

    <OperationalState ID="Error" MonitorTypeStateID="Error" HealthState="Warning"/>

  </OperationalStates>

  <Configuration>

    <IntervalSeconds>300</IntervalSeconds>

    <TimeoutSeconds>200</TimeoutSeconds>

    <Threshold>25</Threshold>

    <NumSamples>6</NumSamples>

  </Configuration>

</UnitMonitor>