> This is why Google and (I assume) Amazon used MySQL internally.
Amazon actually uses a lot of Oracle with some scattering of MySQL.
It looks like Amazon's migrating away from Oracle pretty aggressively, however. https://www.cnbc.com/2018/08/01/amazon-plans-to-move-off-ora...
Re:Postgres 11 – A First Look
by reitanqild on Saturday September 22, 2018 @08:57AM
(#18045804)
That's weird.
But maybe at their scale even Oracle can be made tolerable.
That, and they have some serious leverage in negotiations.
(I used to deal with Oracle DBs a lot a few years ago but thankfully not anymore.)
It also used to be more scalable, because PG's replication story used to be poor. This is why Google and (I assume) Amazon used MySQL internally. This is all a long time ago, but I suspect this is the reason more people are familiar with MySQL than Postgres at these companies. Keep in mind that Spanner was developed and used internally at Google long before it was publicly announced.