3 Articles tagged “Modelisation”

Let’s continue to dive in PostgreSQL Concurrency. Last week’s article PostgreSQL Concurrency: Isolation and Locking was a primer on PostgreSQL isolation and locking properties and behaviors.

Today’s article takes us a step further and builds on what we did last week, in particular the database modeling for a tweet like application. After having had all the characters from Shakespeare’s A Midsummer Night’s Dream tweet their own lines in our database in PostgreSQL Concurrency: Data Modification Language, it’s time for them to do some actions on the tweets: likes and retweet.

Of course, we’re going to put concurrency to the test, so we’re going to have to handle very very popular tweets from the play!



In our previous article we saw three classic Database Modelization Anti-Patterns. The article also contains a reference to a Primary Key section of my book Mastering PostgreSQL in Application Development, so it’s only fair that I would now publish said Primary Key section!

So in this article, we dive into Primary Keys as being a cornerstone of database normalization. It’s so important to get Primary Keys right that you would think everybody knows how to do it, and yet, most of the primary key constraints I’ve seen used in database design are actually not primary keys at all.


Next week we see two awesome PostgreSQL conferences in Europe, back to back, with a day in between just so that people may attend both! In chronological order we have first Nordic pgDay in Oslo where I will have the pleasure to talk about Data Modeling, Normalization and Denormalization. Then we have pgday.paris with an awesome schedule and a strong focus on the needs of application developers!

Dimitri Fontaine

PostgreSQL Major Contributor

Open Source Software Engineer

France