yep, usually multiple different databases are used at that scale, discord getting millions of DB writes a second made them choose use Mongo initially, then even that did not cope with the amount of writes they were getting, they then migrated to Cassandra, and eventually Scylla as their messages DB
I mean there is a reason why YouTube, Paypal, Netflix are using MySQL. Instagram uses PostgreSQL
yep, usually multiple different databases are used at that scale, discord getting millions of DB writes a second made them choose use Mongo initially, then even that did not cope with the amount of writes they were getting, they then migrated to Cassandra, and eventually Scylla as their messages DB
Yeah, relationally DBs force you to be extremely organized when designing them.