monitor checkpoint by Extended Event

CREATE EVENT SESSION Monitor_Checkpoint ON SERVER  
ADD EVENT sqlserver.checkpoint_begin, ADD EVENT sqlserver.checkpoint_end 
(   
ACTION (sqlserver.database_id, sqlserver.sql_text)  
) 
ADD TARGET package0.ring_buffer     
(SET max_memory = 4096) 
WITH (max_dispatch_latency = 1 seconds)
GO 
ALTER EVENT SESSION Monitor_Checkpoint ON SERVER 
STATE = START; 




SELECT
FinalData.x.value ('@name', 'nvarchar(50)') AS EventName, 
FinalData.x.value ('@timestamp', 'nvarchar(50)') AS CheckpointStartTime, 
db_name(FinalData.x.value ('data(data/value)[1]', 'nvarchar(50)')) AS DatabaseID, 
FinalData.x.value ('(action/.)[2]', 'nvarchar(200)') AS SQLText     
FROM
(SELECT CAST(st.target_data AS XML) XMLData 
FROM sys.dm_xe_session_targets st 
JOIN sys.dm_xe_sessions s ON
s.address = st.event_session_address 
WHERE st.target_name = 'ring_buffer'
AND s.name = 'Monitor_Checkpoint'
) data
CROSS APPLY XMLData.nodes ('//RingBufferTarget/event') AS FinalData (x);