http://web.synametrics.com/top10performancetips.htm
http://beginner-sql-tutorial.com/sql-query-tuning.htm
http://www.mindfiresolutions.com/SqlServer-Query-Optimization-Tips-470.php
A transaction is a single unit of work. If a transaction is successful, all of the data modifications made during the transaction are committed and become a permanent part of the database. If a transaction encounters errors and must be canceled or rolled back, then all of the data modifications are erased.
Goal of Normalization is to reduce Redundancy.
Four Technique