Missing Index Hints
One new feature in SQL Server Management Studio 2008 is Missing Index Hints when displaying the execution plan of a query. You can use the Missing Index Hints feature to help identify columns on which adding an index might help the query execute faster and more efficiently. Missing Index Hints is a lightweight, server-side, always-on feature using dynamic management objects and execution plans to provide information about missing indexes that could enhance query performance.
The Missing Index Hints feature is separate from the Database Engine Tuning Advisor available in SQL Server 2008. The Database Engine Tuning Advisor is a more comprehensive tool that assesses the physical database design and recommends new physical ...