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SQL Server error log (Always On Availability Groups)

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Applies to: SQL Server

The SQL Server error log reports events affecting Always On Availability Groups, such as:

  • Communication with the Windows Server Failover Clustering (WSFC) cluster
  • State transitions of availability replicas
  • State transitions of availability databases
  • Connectivity state of availability databases between primary and secondary replicas
  • Statuses of the availability group endpoints
  • Statuses of the availability group listeners
  • Lease status between the SQL Server resource DLL (running in the WSFC cluster) and the SQL Server instance (for more information, see How It Works: SQL Server Always On lease timeout)
  • Error events in the availability group

The following symptoms should lead to review of the SQL Server error log:

  • Cannot access availability databases
  • Unexpected availability group failover
  • Availability group in the Resolving state unexpectedly
  • Availability group in an indeterminate state

For more information, see View the SQL Server error log (SQL Server Management Studio).