Being a mainframe DB2 DBA for IBM Global Services, I found this book useful but not the "Bible" that some have branded it. It covers a wide array of topics relating to mainframe DB2. As some have indicated this is not a text for the UNIX or WINDOWS environment. It is exclusively for OS/390. It is a great starting point for someone looking to gain an overall knowledge of how DB2 works in that environment. But, here again, a text short on depth in many areas. But, in defense of any author trying to put together a text on DB2, there are just too many areas of depth that would have to be covered. I would like to see a text that covers typical knowledge areas and scenarios that a DB2 DBA would encounter on a daily basis and give solutions on the problem. A text that could be used as a training manual for people who want to become a certified DB2 DBA. Still, if you are looking for the one book you should have to begin with, this is the best one so far.