What are the secrets to making your queries run faster? Why does SQL Server use an index for some queries and not for others? What makes a good index? How many indexes should I have? Have you ever asked these questions? When you want to understand an application you look at its core architecture. Underneath the covers SQL Server is just a C++ application. Together we will discuss how the application architecture of SQL Server works, and how to apply this logic to building the best indexes for your queries.