SQL Indexing and Tuning e-Book for developers: Use The Index, Luke covers Oracle, MySQL, PostgreSQL, SQL Server, ...

A site explaining SQL indexing to developers-no crap about administration. SQL indexing is the most effective tuning method-yet it is often neglected during development. Use The Index, Luke explains SQL indexing from grounds up and doesn't stop at ORM tools like Hibernate. Use The Index, Luke is the free web-edition of SQL Performance Explained.