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How about trying update first then check if row exists and then do insert if needed.The initial update would not lock any rows if the row didn't exist in the first place.e.g.Here the NO EXISTS is better because it doesn't need an IS (Intent Shared) lock.However on overall lock use i much rather go with EXISTS method than NO EXISTS.When the SQL Server searches for the data to modify it takes IX lock on the whole page or table and then it takes an X Lock on the rows to be modified. As i said earlier there are two methods of doing this: 1. The NO EXISTS method is more expensive due to the IX page lock by update and insert followed by X Lock by insert.The EXISTS method uses a select * to check if the row exists using only an IS (Intent Shared) lock which is inexpensive compared to the IX lock made by the Update.

duplicating a row in a table with a primary key(auto increment). one suggested writing to temp table then re-insert to original table.Because of the IS lock your " EXISTS" "passes" that check and the delete could wipe that record out ...can you guess what happens to the update statement ? First, both of these methods could theoratically give you a wrong error.1. if rowcount = 0 insert- Lets assume two processes P1 and P2- Lets assume table TAB1 has row R1 Case 1.a (Row R1 does not exist)a. Try insert, then on exception of duplicate row, update.The NO EXISTS method is less expensive due to only one IX and X Lock made by the Update.The EXISTS method again uses a select * to check if the row exists using an IS (Intent Shared) lock followed by an IX and X Lock made by the Update.Dac Services service = new Dac Services(connection String); using(Dac Package package = Dac Package.