http://msdn.microsoft.com/en-us/library/ms174335.aspx
http://msdn.microsoft.com/en-us/library/ms189835.aspx
MSDN上的这两篇文章建议插入和删除时不需要使用Locks。此外,他们建议将删除为这两个操作建议表提示的能力。
The ability to specify the HOLDLOCK, SERIALIZABLE, READCOMMITTED, REPEATABLEREAD,
or UPDLOCK hints on tables that are targets of INSERT statements will be removed
in a future version of SQL Server. These hints do not affect the performance of
INSERT statements. Avoid using them in new development work, and plan to modify
applications that currently use them.