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Exclusive Locks. Exclusive (X) locks prevent access to a resource by concurrent transactions. With an exclusive (X) lock, no other transactions can modify data; read operations can take place only with the use of the NOLOCK hint or read uncommitted isolation level.he following table shows the resource lock modes that the Database Engine uses. Lock mode. Description. Shared (S). Used for read operations that do not change or update data, such as a SELECT statement. Update (U). Used on resources that can be updated.