Fix Checkpoint_XE script

Author: ktaranov

Scripts/Checkpoint_XE.sql

@@ -1 +1,50 @@
- <issues>No</issues>
+<documentation>
+ <summary>Analyze checkpoint extended events result</summary>
+ <returns>1 data set: checploints info.</returns>
+ <issues>No</issues>
+ <author>Aaron Bertrand</author>
+ <created>2020-02-17</created>
+ <modified>2021-09-30 by Konstantin Taranov</modified>
+ <version>1.0</version>
+ <sourceLink>https://github.com/ktaranov/sqlserver-kit/blob/master/Scripts/Checkpoint_XE.sql</sourceLink>
+ <originalLink>https://www.mssqltips.com/sqlservertip/6319/sql-server-checkpoint-monitoring-with-extended-events/</originalLink>
+</documentation>
+
+DROP TABLE IF EXISTS #xml;
+GO
+SELECT ev = SUBSTRING([object_name],12,5), ed = CONVERT(xml, event_data)
+ INTO #xml
+ FROM sys.fn_xe_file_target_read_file('L:\XE_Out\CheckPoint*.xel', NULL, NULL, NULL);
+;WITH Events(ev,ts,db,id) AS
+(
+ SELECT ev,
+ ed.value(N'(event/@timestamp)[1]', N'datetime'),
+ ed.value(N'(event/data[@name="database_id"]/value)[1]', N'int'),
+ ed.value(N'(event/action[@name="attach_activity_id"]/value)[1]', N'uniqueidentifier')
+ FROM #xml
+), 
+EventPairs AS
+(
+ SELECT db, ev, 
+ checkpoint_ended = ts, 
+ checkpoint_began = LAG(ts, 1) OVER (PARTITION BY id, db ORDER BY ts)
+ FROM Events
+),
+Timings AS
+(
+ SELECT 
+ dbname = DB_NAME(db), 
+ checkpoint_began, 
+ checkpoint_ended,
+ duration_milliseconds = DATEDIFF(MILLISECOND, checkpoint_began, checkpoint_ended) 
+ FROM EventPairs WHERE ev = 'end' AND checkpoint_began IS NOT NULL
+)
+SELECT 
+ dbname,
+ checkpoint_count = COUNT(*),
+ avg_seconds = CONVERT(decimal(18,2),AVG(1.0*duration_milliseconds)/1000),
+ max_seconds = CONVERT(decimal(18,2),MAX(1.0*duration_milliseconds)/1000),
+ total_seconds_spent = CONVERT(decimal(18,2),SUM(1.0*duration_milliseconds)/1000)
+FROM Timings
+GROUP BY dbname
+ORDER BY total_seconds_spent DESC;