ruby-pg VS PostgresApp

If you installed Postgres via Homebrew, you need to configure bundler so that when it installs the pg gem, it knows where to find the pg_config executable, which is installed as part of Postgres. The pg gem is the Ruby interface to Postgres and requires pg_config during installation. We can use this command to configure bundler so that it can find it and successfully install pg.

Before we proceed, are you aware that a lot of popular database drivers for Ruby (and Python? not sure) implement the performance-critical bits in good old natively compiled C?

For example, the Ruby postgres gem: https://github.com/ged/ruby-pg/tree/master/ext

(I wasn't sure until I checked just now, so I'm not questioning your familiarity with the tech. Just not sure if that's commonly known)

    So no, it's not the database, it's your interpreted language.

$ gem info pg *** LOCAL GEMS *** pg (1.3.4) Authors: Michael Granger, Lars Kanis Homepage: https://github.com/ged/ruby-pg License: BSD-2-Clause Installed at: /Users/jvon1904/.rvm/gems/ruby-3.0.3 Pg is the Ruby interface to the PostgreSQL RDBMS

The low level pg gem has support for Postgres streaming, but this is row-based. You're wanting to stream effectively from a single field, which Postgres won't do for you.

The ruby-pg gem provides an interface between your Ruby code and your PostgreSQL database.

set RUBY_DLL_PATH=/bin as in our CI before running the ruby app.

> each is in its own OS thread and GVL releases when the thread blocks.

The GVL isn't automatically released when a thread blocks on IO. Each bit of native code performing IO has to explicitly release it like in the pg gem here: https://github.com/ged/ruby-pg/blob/fb465855ce1dd12cf7eb69c9...

A running Rails application needs a database to connect to. You may already have your database of choice installed, but if not, I recommend PostgreSQL, or Postgres for short. On a Mac, probably the easiest way to install it is with Posrgres.app. Another option, the one I prefer, is to use Homebrew. With Homebrew installed, this command will install PostgreSQL version 16 along with libpq:

I was using Postgres.app, but of course, you can download it in any way as long as it works.

There are two ways to connect with the Postgres database which can be in the terminal or using a Postgres GUI client app like DBeaver. But first, download the PostgreSQL installer for macOS or Windows, depending on your OS. The setup and installation come with the psql command, a tool shipped with Postgres that allows you to communicate with Postgres through the command line.

6a. Even stricter option is an "append-only" aka "timeseries" schema, which I highly recommend. Can't remember the last time I didn't use one.

7. If you happen to be testing on a Mac, https://postgresapp.com/ is easier than the MacPorts or Homebrew packages.

And if you're on a Mac, Postgres.app makes it even easier: https://postgresapp.com/

A great app for managing PostgreSQL databases is Postgres.app.