...a good combination of size, price, and content. I have the 3rd edition, which includes an 8-page index. I use this as part of teaching a class in Oracle Developer and recommend it for my students. As the other reviewers recommend, write your name in it...the Oreilly pocket references are easy to misplace, and walk off sometimes. There are four blank pages at the end for your own notes. Content is adequate for its purpose -- for extensive details, the Oracle online documentation is available, if slower to access.
Drawbacks? I'd like a larger index, although the current one is useful. A little bit more room throughout the book for notes might be handy, although it would enlarge the book a bit. I think the content is about right, although there will always be things one can't find, and other topics which are never used in this type of book.
And, as with all the Oreilly pocket references I've seen, there is no colophon, so one must go to the original large book to discover that the insect on the front cover is a moving leaf, Phyllium giganteum, a Malaysian creature which grows to about four inches in length...roughly the width of the book!