I moved the check for ExchangeLock process value = ID earlier in your CASE statement.
SELECT --DeadlockID,
COALESCE(PageLock.Process.value('../../@id', 'varchar(100)'),
KeyLock.Process.value('../../@id', 'varchar(100)'),
RIDLock.Process.value('../../@id', 'varchar(100)'),
ObjLock.Process.value('../../@id', 'varchar(100)'),
ExchangeLock.Process.value('../../@id', 'varchar(100)')
) AS LockID,
COALESCE(PageLock.Process.value('@id', 'varchar(200)'),
KeyLock.Process.value('@id', 'varchar(200)'),
RIDLock.Process.value('@id', 'varchar(200)'),
ObjLock.Process.value('@id', 'varchar(200)'),
ExchangeLock.Process.value('@id', 'varchar(200)')
) AS ProcessId,
CASE WHEN ExchangeLock.Process.value('@id', 'varchar(200)') IS NOT NULL THEN 'ExchangeEvent'
WHEN PageLock.Process.value('@id', 'varchar(200)') IS NOT NULL THEN 'Page'
WHEN KeyLock.Process.value('@id', 'varchar(200)') IS NOT NULL THEN 'Key'
WHEN RIDLock.Process.value('@id', 'varchar(200)') IS NOT NULL THEN 'RID'
WHEN ObjLock.Process.value('@id', 'varchar(200)') IS NOT NULL THEN 'Object'
ELSE 'Unknown' END AS LockType,
COALESCE(PageLock.Process.value('../../@objectname', 'sysname'),
KeyLock.Process.value('../../@objectname', 'sysname') + '.' + KeyLock.Process.value('../../@indexname', 'sysname'),
RIDLock.Process.value('../../@objectname', 'sysname'),
ObjLock.Process.value('../../@objectname', 'sysname'),
ExchangeLock.Process.value('../../@objectname','sysname')
) AS ObjectName,
COALESCE(PageLock.Process.value('@mode', 'varchar(10)'),
KeyLock.Process.value('@mode', 'varchar(10)'),
RIDLock.Process.value('@mode', 'varchar(10)'),
ObjLock.Process.value('@mode', 'varchar(10)'),
ExchangeLock.Process.value('@mode', 'varchar(10)')
) AS LockMode
FROM @DeadlockGraph.nodes('/deadlock-list/deadlock/resource-list') AS Lock(list)
OUTER APPLY Lock.list.nodes('pagelock/owner-list/owner') AS PageLock(Process)
OUTER APPLY Lock.list.nodes('keylock/owner-list/owner') AS KeyLock(Process)
OUTER APPLY Lock.list.nodes('ridlock/owner-list/owner') AS RIDLock(Process)
OUTER APPLY Lock.list.nodes('objectlock/owner-list/owner') AS ObjLock(Process)
OUTER APPLY Lock.list.nodes('exchangeEvent/owner-list/owner') AS ExchangeLock(Process)
Not sure how this will affect the overall results that you seek but it may give you a hint about what you need to do.
My thought question: Have you ever been told that your query runs too fast?
My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.
Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
Since random numbers are too important to be left to chance, let's generate some![/url]
Learn to understand recursive CTEs by example.[/url]
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