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Microsoft.SQLServer.2008.DBEngine.BlockedSPIDsMonitor (UnitMonitor)

Monitors blocked sessions for a SQL instance.

Knowledge Base article:

概要

The Blocking Sessions Monitor detects if a blocking situation exists.

Blocking occurs when one session holds a lock on a specific resource and a second session attempts to acquire a conflicting lock type on the same resource.Blocking is an unavoidable characteristic of any relational database management system (RDBMS) with lock-based concurrency.However, too much blocking can cause performance issues.

原因

When locking and blocking increase to the point where there is a considerable impact on system performance, it is usually due to one of the following reasons:

解決方法

Alternatively if blocked sessions are not a concern for the database:

See also: “ INF: Understanding and resolving SQL Server blocking problems”

Element properties:

TargetMicrosoft.SQLServer.2008.DBEngine
Parent MonitorSystem.Health.PerformanceState
CategoryPerformanceHealth
EnabledFalse
Alert GenerateTrue
Alert SeverityError
Alert PriorityHigh
Alert Auto ResolveTrue
Monitor TypeMicrosoft.SQLServer.2008.DBEngine.BlockedSPIDs
RemotableTrue
AccessibilityPublic
Alert Message
ブロックされているセッション
The session/s {0} in SQL instance "{1}" on computer "{2}" is/are blocked.See "alert context" tab for more details.
RunAsDefault

Source Code:

<UnitMonitor ID="Microsoft.SQLServer.2008.DBEngine.BlockedSPIDsMonitor" Accessibility="Public" Enabled="false" Target="SQL2008Core!Microsoft.SQLServer.2008.DBEngine" ParentMonitorID="SystemHealth!System.Health.PerformanceState" Remotable="true" Priority="Normal" TypeID="Microsoft.SQLServer.2008.DBEngine.BlockedSPIDs" ConfirmDelivery="false">

  <Category>PerformanceHealth</Category>

  <AlertSettings AlertMessage="Microsoft.SQLServer.2008.DBEngine.BlockedSPIDsMonitor.AlertMessage">

    <AlertOnState>Error</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>High</AlertPriority>

    <AlertSeverity>Error</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Data/Context/Property[@Name='BlockedSPIDList']$</AlertParameter1>

      <AlertParameter2>$Target/Property[Type="SQL!Microsoft.SQLServer.ServerRole"]/InstanceName$</AlertParameter2>

      <AlertParameter3>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</AlertParameter3>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

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

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

  </OperationalStates>

  <Configuration>

    <ConnectionString>$Target/Property[Type="SQL!Microsoft.SQLServer.DBEngine"]/ConnectionString$</ConnectionString>

    <IntervalSeconds>300</IntervalSeconds>

    <SyncTime/>

    <WaitMinutes>1</WaitMinutes>

    <NumberBlockedSPIDs>1</NumberBlockedSPIDs>

    <TimeoutSeconds>300</TimeoutSeconds>

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

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

  </Configuration>

</UnitMonitor>