Rating: 

I see 9i and 10g as being complementary releases, in other words the enhancements that the market wouldn't wait for in 9i, were put into 10g instead. My hunch is the timing was market-driven, not technology-driven.

So, for the workaday DBA, I think any kind of "upgrade" learning needs to consolidate both 9i and 10g features that you didn't really have time to get to in the first go-round. This book covers the "best of" 9i that you should also be taking advantage of in 10g, if not already.

At the price, (download PDF) it's impossible to see how this is not worth the time to buy and read.