Re: Quesion about querying distributed databases

On Wed, 2025-03-05 at 12:57 +0330, me nefcanto wrote:
> Right now this data is in MariaDB, on separate databases (schema) but on one
> server. The solution in this situation is to have a cross-database query.
> (this is the status quo of our application)
>
> Now our team has decided to migrate to Postgres. However, we realized that
> Postgres does not support cross-database queries. And if we want to do so,
> we should use FDW. So, we thought we might as well put databases on separate
> servers for scalability if we have to write more code. That's the reason
> behind this question.

In MySQL, the terms "database" and "schema" are used for the same thing.
Not so in PostgreSQL.  I think you should migrate the data into different
schemas in a single database, pretty much like you had it in MySQL.
Then you don't need a foreign data wrapper, and I bet the query can
perform as well as it did on MySQL.

Yours,
Laurenz Albe