Dulcian’s Michael Rosenblum and Dr. Paul Dorsey have just completed another book for Oracle Press: Oracle PL/SQL Performance Tuning Tips & Techniques
This book present a hands-on approach to enabling optimal results from PL/SQL. The book begins by describing the discovery process required to pinpoint performance problems and then provides measurable and repeatable test cases. In-depth coverage of linking SQL and PL/SQL is followed by deep dives into essential Oracle Database performance tuning tools. Real-world examples and best practices are included.
You can buy it from Amazon or Oracle Press
Eddie Awad read the book and has some comments, make sure you get to the comments!
http://awads.net/wp/2014/08/18/database-as-a-storage-dbaas-vs-thick-database/