“A free book” aka a book by a database vendor that wants to skew the premise of this-is-just-a-discussion-on-performance-at-scale-vendor-agnostic to that very vendor. Nothing is free. It’s all marketing.
Alex Debrie: " Damn, this is an excellent resource. I read the first few chapters closely and plan to return to the rest. Lots of interesting stuff + frank discussion of how to truly evaluate different database options."