The book Der Oracle DBA (Hanser, 2011), which was written in German, is at last available!
I say “at last” because the authors worked on this project for not less than two years.
Who are the authors? Several colleagues of mine at Trivadis (Mirko Hotzy, Konrad Häfeli, Daniel Steiger, Sven Vetter, Peter Welker), Andrea Held, Lutz Fröhlich, Marek Adar and myself.
For my part, I wrote two chapters: Speicherplatzverwaltung and Optimierung.