The Database Hackers Handbook by Litchfield/Anley/Heasman/Grindlay is a must have reference if you encounter/support databases or are a DBA. This book covers the most popular databases: Oracle, DB2, Informix, Sybase, MySQL, MSSQL and Postgres. The book is devided into sections for each database technology: Architecture, Discovery/Attack/Defense, Moving Further into the Network and wrapping each technology up with Securing.

I cannot say enough about this book! In fact, this book is a great supplement to Episode #3: Hacking Oracle to take you well beyond what was demonstrated in that podcast. This book should definately be on your bookshelf!