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You might be getting lock escalation. This is when SQL Server replaces many fine-grained (row) locks with a single coarse-grained (table) lock to save system resources. This is most likely if you are processing many rows within a transaction. That link suggests some work-arounds.


There is the possibility that you are getting lock escalations onto the table level, or page locks on the clustered index page. A deadlock graph will show that, try starting a SQL Server trace grabbing just the Deadlock graphs from the server and check those You can also delete in batches which will improve concurrency and if the delete is handling large ...


According to the documentation located at http://www.postgresql.org/docs/9.4/static/explicit-locking.html#LOCKING-DEADLOCKS (emphasis mine): PostgreSQL automatically detects deadlock situations and resolves them by aborting one of the transactions involved, allowing the other(s) to complete. (Exactly which transaction will be aborted is difficult to ...

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