which concurrency control is more efficient pessimistic or optimistic concurrency control

Question

I would like to know which concurrency control is more efficient, pessimistic or optimistic concurrency control? Is there a special reason why SQL Server 2005 uses pessimistic c

Answer 1

This depends entirely on what concurrency needs your application has. If you are developing an OLTP app, pessiimistic would probably be best... If you are developing a single-user database, optimistic is fine.