Optimise/Tuning

Links

See Optimise/Tuning in Links.

Execution Plan

Make sure you have selected Query, Include Actual Execution Plan (or press the button on the tool bar).

When you run the query an extra tab will be displayed showing the Execution Plan.

Understanding the Execution Plan

Index Seek Vs. Index Scan (Table Scan) (PDF):

../../../misc/howto/microsoft/sql-server/sql-server-index-seek-vs-index-scan-table-scan.pdf

Copy of blog entry by Pinal Dave

Statistics

General Tips on Optimizing SQL Server Indexes

Union

…change UNION in the view to UNION ALL. SQL does extra processing when you do UNION to ensure the rows returned are unique. As we know they are unique we can use UNION ALL.