SQL Performance in SQL Server
This is an SQL performance video using SQL Server. Indexes , dynamic management views, and improved query design are covered. Clustered and unclustered indexes are both talked about and some examples are given. Improved query design is covered, and an example is shown where doing an or condition in the from clause severely affects performance. Another bad technique is to do a scalar subquery. An example is given where the aggregate in a query is captured by a variable and then the variable is used in a query . This method definitely improved performance. A few SQL Server performance tools are also examined and are used to evaluate performance including actual client execution plans and settings before the query to determine time elapsed.
