Some synchronous replicas are not synchronized

THIS TOPIC APPLIES TO: yesSQL ServernoAzure SQL DatabasenoAzure SQL Data Warehouse noParallel Data Warehouse


Policy Name Synchronous Replicas Data Synchronization State
Issue Some synchronous replicas are not synchronized.
Category Warning
Facet Availability group


This policy rolls up the data synchronization state of all availability replicas and checks for any availability replicas that are not in the expected synchronization state. The policy is in an unhealthy state when any asynchronous replica is not in a SYNCHRONIZING state and any synchronous replica is not in a SYNCHRONIZED state. The policy state is otherwise healthy.


For this release of SQL Server 2017, information about possible causes and solutions is located at Some synchronous replicas are not synchronized on the TechNet Wiki.

Possible Causes

In this availability group, at least one synchronous replica is not currently synchronized. The replica synchronization state could be either SYNCHONIZING or NOT SYNCHRONIZING.

Possible Solution

Use the availability replica policy state to find the availability replica with the incorrect synchronization state, and then resolve the issue at the availability replica.

See Also

Overview of Always On Availability Groups (SQL Server)
Use the Always On Dashboard (SQL Server Management Studio)