Thomas LaRock: "Without a basic understanding of wait events and how the occur, you will waste a lot of time trying and guessing at how to improve the performance of a query." Optimizing SQL Server ...

Causes [!INCLUDE ssNoVersion] to display information about the amount of physical and logical IO activity generated by [!INCLUDE tsql] statements. Physical IO is ...

SQL Data Warehouse uses statistics to assess the cost of different ways to perform a distributed query. When statistics are accurate, the query optimizer can generate high quality query plans that ...