Mongodb has a 15b market cap, and mongo is widely derided.

Aeolun · on March 13, 2021

But it’s the only real player in their market. RethinkDB with MongoDB ‘performance’ would have blown them out of the water.

goatinaboat · on March 13, 2021

But it’s the only real player in their market

Not at all. All of MongoDB is just a feature in Postgres, and Postgres does it better, and Postgres does hundreds more things too.

gqewogpdqa · on March 13, 2021

I like both databases. Saying that MongoDB is a subset of PostgreSQL is not right, IMO. They are both powerful databases. For legacy off-Oracle or off-SQL Server migration, PostgreSQL sure is an easier place to start (though you still likely have to re-write/re-tune your application). For new apps, you could start with either.

The idea that PostgreSQL is a superset of MongoDB is incorrect. As some examples, PostgreSQL doesn't shard, have multi-region, multi-cloud, enforce JSON schema, data governance, full JSON support, etc.

That said, PostgreSQL does do a lot of things MongoDB doesn't do.

The two products have a big feature overlap - both are great databases. I think you could build a modern app on either one. If you want to build in modern languages faster and have a more available system out of the box, I'd suggest MongoDB. If you have legacy skillsets, legacy apps, or just love relational, I'd suggest PostgreSQL.

Aeolun · on March 13, 2021

MongoDB is not in the same market as postgres.

I don’t disagree with you, but the people that choose Mongo do not see postgres as a valid alternative.

thesimon · on March 13, 2021

>and Postgres does hundreds more things too.

being hip, which is one of the most important factors for choosing a database database technology, is not one of them though.

senderista · on March 13, 2021

They finally got their engineering act together (via the Sleepycat acquisition), long after they'd made it big.

mrweasel · on March 13, 2021

Didn’t Oracle buy Sleepycat?

bboreham · on March 13, 2021

Mongo bought WiredTiger.

Both founded by Keith Bostic, from Berkeley DB heritage.

senderista · on March 14, 2021

Yes, my bad, I was referring to WiredTiger (still the same folks).