Ken England & Gavin JT Powell 
Microsoft SQL Server 2005 Performance Optimization and Tuning Handbook [PDF ebook] 

Database professionals will find that this new edition aids in mastering the latest version of Microsoft’s SQL Server. Developers and database administrators (DBAs) use SQL on a daily basis in application development and the subsequent problem solving and fine tuning. Answers to SQL issues can be quickly located helping the DBA or developer optimize and tune a database to maximum efficiency.Basic questions are easily located on the topics of filtering, sorting, operators, conditionals, pseudo columns, single row functions, joins, grouping functions, sub queries, composite queries, hierarchies, flashback queries, parallel queries, expressions and regular expressions. Assistance on DML, data types (including collections), XML, DDL for basic database objects such as tales, views and indexes, partitioning, and security is also considered.* Identifies and discusses the most common issues database administrators (DBAs) face day-to-day*Provides DBAs with solutions actually used by the authors in enterprise environments*Explores new features which add more control but reduce performance