I would like to thank the technical reviewers of the book—Mark Round, Darryl Gove, Philip Brown, Hosam Al Ali, and Johnny Trujillo—who have performed outstanding work and have helped to make this book better than the initial draft. Especially, my sincere and honest thanks to Mark Round for a detailed and accurate review of this book. I am certainly a lucky professional to have all the support and help of Ms. Swati Kumari, Ms. Anila Vincent, Mr. Mohammad Rizvi, Anand Singh, and Nikhil Potdukhe from the Packt Publishing team during all the stages of this book. On several occasions, Ms. Swati and Ms. Anila offered sweet and good words, which helped me to continue writing. Although they are not part of this book, thanks to Rick Ramsey (from Oracle), who has helped, taught, and motivated me to write for Oracle Technical Network (OTN), and to Karen Perkins (technical editor and writer), from whom I have been learning how to write better articles.

Finally, I owe all my education and success to my mother, who has worked her whole life and taken huge efforts to give me an opportunity to study even when there was no money to live.