$ 0 0 hiref plshttp://www.sql-server-performance.com/http://msdn.microsoft.com/en-us/library/ff647793.aspxhttp://blog.sqlauthority.com/2007/04/27/sql-server-select-vs-set-performance-comparison/http://www.brentozar.com/archive/2006/12/dba-101-using-perfmon-for-sql-performance-tuning/http://blog.sqlauthority.com/2009/06/10/sql-server-performance-counters-from-system-views-by-kevin-mckenna/thank u