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From: Laurenz Albe <[email protected]>
To: me nefcanto <[email protected]>
Cc: Adrian Klaver <[email protected]>
Cc: [email protected]
Subject: Re: Quesion about querying distributed databases
Date: Wed, 05 Mar 2025 10:55:01 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAEHBEOBXzkGTqxQSYqmEFN5hbc=zsGWFpU9h8zf7AAPv4VdOWQ@mail.gmail.com>
References: <CAEHBEOBuoMFWuhHM3L_Zr6o1enELju-Vns6Pknt4TT+6MFQOwQ@mail.gmail.com>
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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

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