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Category: How To

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Here you can find all blog posts about the Category: How To. You can go back to all blog posts or take a look into our other categories & tags.

Unexpected downsides of UUID keys in PostgreSQL

by Ants Aasma | 06.2023
There are various compelling reasons to use universally unique identifiers (UUID) as primary keys. Two examples are: To be able […]

Use HOT, so CLUSTER won't rot in PostgreSQL

by Laurenz Albe | 06.2023
CLUSTER is sometimes the last resort to squeeze performance out of an index scan. Normally, you have to repeat CLUSTER […]

What is a schema in PostgreSQL?

by Hans-Jürgen Schönig | 06.2023
What is a schema in PostgreSQL? Why do we need a schema and how can schemas be used to make your life easier? Let's find out.

ERROR: invalid byte sequence - Fix bad encoding in PostgreSQL

by Laurenz Albe | 05.2023
(Inscription seen on a T-shirt) It's annoying to get error messages caused by encoding problems. But it is more annoying […]

PostgreSQL ALTER DEFAULT PRIVILEGES - permissions explained

by Laurenz Albe | 05.2023
  Many people have heard that ALTER DEFAULT PRIVILEGES makes it easy to allow other users access to tables. But […]

Let’s party and upgrade PostgreSQL and PostGIS together

by Florian Nadler | 05.2023
Some time ago, I presented a typical approach to upgrade PostGIS under Ubuntu. Please take a look at my previous […]

Docker and sudden death for PostgreSQL

by Laurenz Albe | 05.2023
  This is a short war story from a customer problem. It serves as a warning that there are special […]

Underscores in numeric constants in PostgreSQL 16

by Pavlo Golub | 04.2023
SQL and numeric constants NEW in PostgreSQL 16 - support for underscores in integer and numeric constants! I already wrote […]

Row locks in PostgreSQL

by Laurenz Albe | 04.2023
  The PostgreSQL documentation has some information about row locks. But typically, you cannot see them in pg_locks, and not […]

Breaking your PostgreSQL database with bad CHECK constraints

by Laurenz Albe | 03.2023
I am on a spree! After writing about breaking your database and transaction ID wraparound, here I am writing about […]
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