Must-read Books for DBA This question is almost mandatory in any SE site for basic reference.

Please post only books with permanently value for DBAs in general.

The post should be a must read book, the classical ones, the foundation books, not books for specific products or dated.

The latest book for MS-SQL Server 2008 could be the state of the art but it is dated and specific.

I have a genuine interest. I'm basically a programmer and database knowledge is a flaw on my formation. I know lot of things about the databases just doing day-by-day tasks.
I started with an example of good must read book.

An Introduction to Database Systems by C.J. Date.

This is one of the most influential book to development of all concepts and technological available today. The book follows an academic style and has lots of real cases.

The primary target is not for DBAs but Database systems developers, but a real good DBA knows how your database works and how to handle with its limitations and hidden capabilities.