Dead Lock Problem

Question

Hi Everyone,
I have a problem with a stored procedure that when it's called from multiple clients at once it keeps causing deadlocks or not performing the way it's supposed.
I have the table below. The requirment is to insert a row in the table and increment the TrackingNumber by 1. The tracking number has to be sequential for each TrackingAsset and cannot skip number. The requirement at out of my control so I can't change them
just have to find a way to correct them.
Table Defention
CREATE TABLE [dbo].TrackingTable(
TrackingID [uniqueidentifier] NOT NULL,
TrackingNumber [bigint] NOT NULL,
TrackingAsset [uniqueidentifier] NOT NULL
) ON [PRIMARY]
The statement of the stored procedure that keeps dead locking is:
DECLARE @TrackingID UNIQUEIDENTIFIER = NEWID()
DECLARE @TracckingAsset UNIQUEIDENTIFIER = '01B8EBA6-64BE-48F6-841E-EF1988BFC9F7'
INSERT INTO
TrackingTable
TrackingID,
TrackingNumber,
TrackingAsset)
VALUES (
@TrackingID,
COALESCE(( SELECT MAX ( TrackingNumber ) From TrackingTable WHERE TrackingAsset= @TrackingAsset*/),0) + 1,
@TrackingAsset)
All the column names and table names are changed so don't mind spelling mistakes and names that don't make sense.
The Coalesce is there because the TrackingAsset may not exist so it'll return a null.
I've tired all (and I mean all) Transaction Isolation level to no avail. Depending on the isolation level I'll either get deadlocks or the TrackingNumber will not be Unique and Sequential.
I've also tried creating a table to hold the TrackingAsset and TrackingNumber and getting the number from there. It still caused the same issues. 
Does anyone see a way around this?

Answer 1

Hi
I think U must try With NOLock OPtion OR table hints
Ref :
http://technet.microsoft.com/en-us/library/ms187373.aspx
http://technet.microsoft.com/en-us/library/aa213026(v=sql.80).aspx
http://blog.sqlauthority.com/2011/05/08/sql-server-what-kind-of-lock-with-nolock-hint-takes-on-object/
http://blog.sqlauthority.com/2011/04/17/sql-server-applying-nolock-hint-at-query-level-nolock-for-whole-transaction/
http://www.codeproject.com/Tips/590560/wi
http://stackoverflow.com/questions/686724/sql-when-should-you-use-with-nolock
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/f81ace67-1fb5-4fea-a2b9-344eca00f453/why-we-use-withnolock-in-sql-server-with-table?forum=transactsqlAll
The Best
Shridhar J Joshi Thanks a lot