How can I check the failover history of the nodes in Always On availability groups ?


How can I check the failover history of the nodes in Always On availability groups ?  SQL DBA

SQL Server Availability Groups (AG) provide high availability and disaster recovery solutions for critical databases. Understanding the history of failovers in an AG is crucial for tracking changes in primary and secondary nodes, ensuring system stability, and diagnosing potential issues. In this blog post, we'll share a handy script that allows you to access and analyze the failover history of the primary node within a SQL Server cluster.

Please find the gitHub Link for the same.

Script origin :
Reshared @ :

Full Credit to auther. 
declare @xel_path varchar(1024);
declare @utc_adjustment int = datediff(hour, getutcdate(), getdate());

------------------- target event_file path retrieval --------------------------
            target_data = 
            convert(xml, target_data)
        from sys.dm_xe_sessions s
            inner join sys.dm_xe_session_targets st
            on s.address = st.event_session_address
        where = 'alwayson_health'
            and st.target_name = 'event_file'
            full_path = 
            target_data.value('(EventFileTarget/File/@name)[1]', 'varchar(1024)')
        from target_data_cte
    @xel_path = 
        left(full_path, len(full_path) - charindex('\', reverse(full_path))) + 
from full_path_cte;

------------------- replica state change events -------------------------------
            event_data = 
            convert(xml, event_data)
        from sys.fn_xe_file_target_read_file(@xel_path, null, null, null)
    event_timestamp = 
        dateadd(hour, @utc_adjustment, event_data.value('(event/@timestamp)[1]', 'datetime')),
    ag_name = 
        event_data.value('(event/data[@name = "availability_group_name"]/value)[1]', 'varchar(64)'),
    previous_state = 
        event_data.value('(event/data[@name = "previous_state"]/text)[1]', 'varchar(64)'),
    current_state = 
        event_data.value('(event/data[@name = "current_state"]/text)[1]', 'varchar(64)')
from state_change_data
where object_name = 'availability_replica_state_change'
order by event_timestamp desc;

Monitoring the history of failovers in a SQL Server Availability Group is an essential task for database administrators. The script shared in this blog post provides a convenient method to access and analyze replica state change events, helping you pinpoint the exact moment a secondary node assumed the role of the primary node.

Lince Sebastian

Indian MSSQL DBA thriving in database management - ensuring efficiency and smooth operations. Devoted father of two and avid Clash of Clans player, driven by strategic thinking. Football fuels my passion - cheering Kerala Blasters and Arsenal. I share my professional and life insights through my blog.


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