SQL Server Query Plans --- Reuse or Recompile?

What determines when a plan is reused? When is it better to recompile? Reusing an inappropriate plan cause a huge reduction in query response time. On the other hand, recompiling a frequently run query every time it’s executed can also cause big performance problems.   In this seminar, we’ll discuss how SQL Server decides to recompile or reuse an existing plan, and how you can tell if that’s a good choice. We’ll also look at how you can ‘encourage’ SQL Server to do what you want it to do. The seminar includes extensive demonstrations that illustrate the details of SQL Server plan caching and recompilation, as well as the internals of the plan cache and the metadata available for examining its contents. This seminar will be presented on SQL Server 2014 and cover features specific to that version, but most of the information is relevant to SQL Server 2012 and SQL Server 2008 as well.