sql-server-deadlock-graph-extended-events.sql

SELECT XEvent.query('(event/data/value/deadlock)[1]') AS DeadlockGraph
FROM (
    SELECT XEvent.query('.') AS XEvent
    FROM (
        SELECT CAST(target_data AS XML) AS TargetData
        FROM sys.dm_xe_session_targets st
        INNER JOIN sys.dm_xe_sessions s ON s.address = st.event_session_address
        WHERE s.NAME = 'system_health'
            AND st.target_name = 'ring_buffer'
        ) AS Data
CROSS APPLY TargetData.nodes('RingBufferTarget/event[@name="xml_deadlock_report"]') AS XEventData(XEvent)
) AS source;