Some PostgreSQL configuration parameters can be changed only by reloading the entire configuration file(s).
There are two variants of this recipe, depending on whether you are using systemd. This is similar to the previous recipes in this chapter, and especially the Starting the database server manually recipe. More details are explained there, such as the exact names of systemd service units depending on which database server you want to reload, and which GNU/Linux distribution you are working on.
With systemd, configuration files can be reloaded with the following syntax:
sudo systemctl reload SERVICEUNIT
Here, SERVICEUNIT must be replaced with the exact name of the...