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Availability Replicas Data Synchronization monitor

Microsoft.SQLServer.2016.AlwaysOn.AvailabilityReplicasSynchronizing (UnitMonitor)

Availability Replicas Data Synchronization

Knowledge Base article:

Summary

This monitor rolls up the data synchronization state of all availability replicas in the availability group and check whether any availability replica’s synchronization is not operational. The monitor is unhealthy if any of availability replica’s data synchronization state is NOT SYNCHRONIZING. The monitor is healthy if none of availability replica’s data synchronization state is NOT SYNCHRONIZING.

Causes

In this availability group, at least one secondary replica has a NOT SYNCHRONIZING synchronization state and is not receiving data from the primary replica.

Resolutions

Find the availability replica with NOT SYNCHRONIZING state using availability replica monitor state and resolve the issue at the availability replica.

Overrideable Parameters

Name

Description

Default Value

Enabled

Enables or disables the workflow.

Yes

Generates Alerts

Defines whether the workflow generates an Alert.

No

Interval (seconds)

The recurring interval of time in seconds in which to run the workflow.

900

Timeout (seconds)

Specifies the time the workflow is allowed to run before being closed and marked as failed.

300

Element properties:

TargetMicrosoft.SQLServer.2016.AlwaysOn.AvailabilityGroupHealth
Parent MonitorSystem.Health.AvailabilityState
CategoryAvailabilityHealth
EnabledTrue
Alert GenerateFalse
Alert Auto ResolveFalse
Monitor TypeMicrosoft.SQLServer.2016.AlwaysOn.SystemPolicyScriptMonitorType
RemotableTrue
AccessibilityPublic
RunAsMicrosoft.SQLServer.MonitoringAccount

Source Code:

<UnitMonitor ID="Microsoft.SQLServer.2016.AlwaysOn.AvailabilityReplicasSynchronizing" RunAs="GPMP!Microsoft.SQLServer.MonitoringAccount" TypeID="Microsoft.SQLServer.2016.AlwaysOn.SystemPolicyScriptMonitorType" Accessibility="Public" Enabled="true" ParentMonitorID="Health!System.Health.AvailabilityState" Remotable="true" Target="AlwaysOnDisc!Microsoft.SQLServer.2016.AlwaysOn.AvailabilityGroupHealth" 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>$Target/Property[Type="AlwaysOnDisc!Microsoft.SQLServer.2016.AlwaysOn.AvailabilityGroupHealth"]/AvailabilityGroupName$-AlwaysOnAgReplicasDataSynchronizationHealthPolicy</PolicyName>

    <InstanceName>$Target/Property[Type="AlwaysOnDisc!Microsoft.SQLServer.2016.AlwaysOn.AvailabilityGroupHealth"]/InstanceName$</InstanceName>

  </Configuration>

</UnitMonitor>