In the case of CockroachDB (a distributed database), it has the same wire-level protocol as Postgresql. So if your programming language has a Postgresql driver (and it likely does), then you can also talk to a CDB database as well.

The SQL dialects are not the same, though they are similar, so you will have to go through your code to see if you need to fix anything. Moving the data itself over is fairly straight-forward:

https://www.cockroachlabs.com/docs/stable/migrate-from-postg...

Ok, so the "driver protocol" would be another way of saying that.

Not parent. No idea about the defacto standard comment. CockroachDB client protocol is* compatible with PostgreSQL. Edit: as well as SQL syntax, that's the important bit.

Meaning you could in theory mirror data to CockroachDB and the point your clients to it instead of PostgreSQL. CockroachDB is aiming to solve horizontal scaling, hence the "grow" comment.

PostgreSQL underlies at least a plurality of SQL DBMS developments nowadays, specially for scale-out (distributed) projects.

Any sources on that assertion? A quick bit of Google searching [1] shows me only ~10% market share for PostgreSQL, compared to ~46% for MySQL.

[1] https://www.datanyze.com/market-share/databases/postgresql-v...

That's a joke right? I mean, you don't measure market share by looking at how many "websites" use one or the other database.

because wordpress