• please provide the query plan(s).

    My guess is the index is being scanned, so the updlock may indeed block it all.

    p.s. are you sure this is a SQL2012 instance ? The deadlock xml isn't formatted in the latest SQL2008/SQL2012 format.

    If it is an RTM version, you may want to apply SP1 ( and maybe even the most recent CU. )

    Johan

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