There are several modes to stop the server, depending on the level of urgency. We'll do a comparison in view of the effects in each mode.
We provide two variants: with and without systemd. This is similar to the previous recipe, Starting the database server manually, which we'll refer to for further information. For example, what is the exact name of the systemd service unit for a given database server on a given GNU/Linux distribution?
When using systemd, you can stop PostgreSQL using the fast mode by issuing the following after having replaced SERVICEUNIT with the appropriate systemd service unit name:
sudo systemctl stop SERVICEUNIT
If systemd is not available...