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Availability Database Data Synchronization

Microsoft.SQLServer.2012.AlwaysOn.DbrDataSynchronizationState (UnitMonitor)

Knowledge Base article:

Summary

This monitor checks the data synchronization state of database replica. The monitor is unhealthy state when the data synchronization state is NOT SYNCHRONIZING or the state is not SYNCHRONIZED for synchronous commit database replica.

Causes

The data synchronization state of this availability database is unhealthy. On an asynchronous-commit availability replica, every availability database should be in the SYNCHRONIZING state. On a synchronous-commit replica, every availability database should be in the SYNCHRONIZED state.

Resolutions

Resolve any connection or data movement suspend issue. Check events for the issue using SSMS and find database error and follow the troubleshooting for the specific error to resolve it.

Element properties:

TargetMicrosoft.SQLServer.2012.AlwaysOn.DatabaseReplica
Parent MonitorSystem.Health.AvailabilityState
CategoryAvailabilityHealth
EnabledTrue
Alert GenerateFalse
Alert Auto ResolveFalse
Monitor TypeMicrosoft.SQLServer.2012.AlwaysOn.SystemPolicyScriptMonitorType
RemotableTrue
AccessibilityPublic
RunAsMicrosoft.SQLServer.2012.AlwaysOn.MonitoringAccount

Source Code:

<UnitMonitor ID="Microsoft.SQLServer.2012.AlwaysOn.DbrDataSynchronizationState" RunAs="Microsoft.SQLServer.2012.AlwaysOn.MonitoringAccount" TypeID="Microsoft.SQLServer.2012.AlwaysOn.SystemPolicyScriptMonitorType" Accessibility="Public" Enabled="true" ParentMonitorID="Health!System.Health.AvailabilityState" Remotable="true" Target="AlwaysOnDisc!Microsoft.SQLServer.2012.AlwaysOn.DatabaseReplica" Priority="Normal">

  <Category>AvailabilityHealth</Category>

  <OperationalStates>

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

    <OperationalState ID="Critical" MonitorTypeStateID="ErrorState" HealthState="Warning"/>

  </OperationalStates>

  <Configuration>

    <Interval>900</Interval>

    <TimeoutSeconds>300</TimeoutSeconds>

    <PolicyName>$Target/Property[Type="AlwaysOnDisc!Microsoft.SQLServer.2012.AlwaysOn.DatabaseReplica"]/AvailabilityGroupName$-$Target/Property[Type="AlwaysOnDisc!Microsoft.SQLServer.2012.AlwaysOn.DatabaseReplica"]/Name$-AlwaysOnDbrDataSynchronizationState</PolicyName>

    <InstanceName>$Target/Property[Type="AlwaysOnDisc!Microsoft.SQLServer.2012.AlwaysOn.DatabaseReplica"]/AvailabilityReplicaServerName$</InstanceName>

  </Configuration>

</UnitMonitor>