" The reality is no-one data model works for all applications"
And they need 75 years of collective experience to know that? really?
By any measure, BerkeleyDB was a hit. It became the world’s most widely deployed embedded and open-source database, meaning that the company which did the most work to maintain it, Sleepycat, got swallowed by Larry Ellison’s database giant Oracle in 2006. Mike Olson was Sleepycat’s business chief. He’s now CEO of Hadoop …
MongoDB had been a slave to locking – make a change to one field or object and the entire database was locked while changes were replicated.
Just like MySQL's MyASM table type and how much fun that is!
This PR piece reads a bit like: "The last version was shit. The new version is less shit". Actually, the whole thing reads a bit like replacing MongoDB with a BerkeleyDB backend, which begs the question why this wasn't done in the first place?