Good engineering is the difference between code running in eight minutes or eight hours. It affects real people in real ways. It’s not a “matter of opinion" any more than a bird taking flight is a “matter of opinion.”—H. W. Kenton
General SQL Server performance tuning is outside the scope of this book. That subject alone could easily fill several volumes on its own. Instead, the focus of this chapter is on tuning the performance of Transact-SQL queries. The options are many and the tools are sometimes complex, but there are a number of specific techniques you can employ to write optimal Transact-SQL code and to improve the performance of queries that don’t perform acceptably well.