Rækkelåse - manuel brug af dem

Den slags tilgang, jeg vil anbefale, er at have et felt i posten på linje med, der angiver, om posten behandles eller ej. Implementer derefter en "læs næste fra køen"-sproc, der gør følgende for at sikre, at ingen 2 processer opfanger den samme post:

BEGIN TRANSACTION

-- Find the next available record that's not already being processed.
-- The combination of UPDLOCK and READPAST hints makes sure 2 processes don't 
-- grab the same record, and that processes don't block each other.
SELECT TOP 1 @ID = ID
FROM YourTable WITH (UPDLOCK, READPAST)
WHERE BeingProcessed = 0

-- If we've found a record, set it's status to "being processed"
IF (@ID IS NOT NULL)
    UPDATE YourTable SET BeingProcessed = 1 WHERE ID = @ID

COMMIT TRANSACTION

-- Finally return the record we've picked up
IF (@ID IS NOT NULL)
    SELECT * FROM YourTable WHERE ID = @ID

For mere information om disse tabeltip, se MSDN