Lock: DB engine locks the rows/page/table to access the data which is worked upon according to the query.
Block: When one process blocks the resources of another process then blocking happens. Blocking can be identified by using
SELECT * FROM sys.dm_exec_requests where blocked <> 0
SELECT * FROM master..sysprocesses where blocked <> 0
Deadlock: When something happens as follows: Error 1205 is reported by SQL Server for deadlock.
Block: When one process blocks the resources of another process then blocking happens. Blocking can be identified by using
SELECT * FROM sys.dm_exec_requests where blocked <> 0
SELECT * FROM master..sysprocesses where blocked <> 0
Deadlock: When something happens as follows: Error 1205 is reported by SQL Server for deadlock.
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