Detecting dirty reads from a stored procedure

Question

I\'ve got 100 threads that are each calling the stored procedure as defined below.

How do I prevent dirty reads?

SET QUOTED_IDENTIFIER OFF
SET ANSI_NULLS         


        

Answer 1

As already mentioned, you can use the auto increment built-in functionality, such as identity columns or sequence.

If you don't want this, you need to make the access to the table in serial manner: using application lock or other abilities.

For example, you can add the hints to the FIRST access to the table (in the transaction) like the below:

UPDATE CfgCerealNumber
Set CerealNumber = CerealNumber + 1
FROM CfgCerealNumber with (tablockx, holdlock)
WHERE CerealNumberID = @TableID

This will guarantee the sequential access to the table in all parallel threads.