The sys schema is the brainchild of Mark Leith, who has also for long been part of the team that develops MySQL Enterprise Monitor. He started the ps_helper project to experiment with monitoring ideas and to showcase what the Performance Schema was able to do while making it simpler at the same time. The project was later renamed to the sys schema and moved into MySQL. There have since been contributions from several other people, including the author of this book.
The sys schema is available for MySQL Server 5.6 and later. In MySQL 5.7 it became part of the standard ...
