Si se refiere a un bloqueo de tipo de cola seguro de simultaneidad, ¿utilice las sugerencias ROWLOCK, UPDLOCK, READPAST?
Condición de carrera de cola de proceso de SQL Server
BEGIN TRAN
SELECT TOP 1 @QueryID = [ID] from Table WITH (ROWLOCK, UPDLOCK, READPAST)
UPDATE Table SET [Read] = 1 WHERE [ID] = @QueryID
COMMIT TRAN -- TRAM
Sin embargo, en una declaración. algo como
WITH T AS
(
--ORDER BY with TOP , or perhaps MIN is better?
SELECT TOP 1 [Read], [ID] from Table
WITH (ROWLOCK, UPDLOCK, READPAST) ORDER BY [Read]
)
UPDATE
T
SET
[Read] = 1;