SQL Performance

SQL Azure Performance – Query Optimization:
http://www.sqlazureperformance.com/2010/sql-azure-performance-query-optimization/

Simple Query tuning with STATISTICS IO and Execution plans:
http://www.simple-talk.com/sql/performance/simple-query-tuning-with-statistics-io-and-execution-plans/

显示图形执行计划 (SQL Server Management Studio):
http://msdn.microsoft.com/zh-cn/library/ms178071(v=SQL.90).aspx  (中)
http://msdn.microsoft.com/en-us/library/ms178071.aspx (英)