sql server 2012 - Upsert Causes Deadlocks -


i have following stored procedure:

    create procedure [dbo].[upsert2] (     @id varchar(20),     @status varchar(50),     @price  varchar(20),     @volume varchar(20),     @currency   varchar(20),     @instrumentid   varchar(20),     @seqid  varchar(20),     @entrydate  datetime)     set transaction isolation level read uncommitted;     begin transaction     merge trades using      (select @id 'id',@status 'status',@price 'price',@volume 'volume',@currency 'currency',@instrumentid 'instrumentid',@seqid 'seqid',@entrydate 'entrydate') query     on trades.id = query.id , trades.instrumentid = query.instrumentid , trades.seqid = query.seqid when matched     update set         trades.status = query.status,         trades.price = query.price,         trades.volume = query.volume,         trades.span = query.span,         trades.currency = query.currency,         trades.instrumentid = query.instrumentid,         trades.seqid = query.seqid,         trades.entrydate = query.entrydate  when not matched         insert (status,price,volume,span,currency,instrumentid,seqid,entrydate)          values (query.status,query.price,query.volume,query.span,query.currency,query.instrumentid,query.seqid,query.entrydate); commit

this procedure called 4 diffrent processes, run @ same time, wich causes produce deadlocks , fail calls, there wrong procedure can fix cure deadlocks, have no more ideas how fix it.


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