Lightweight use of transients (LT, en)

WordPress Transients API is a powerful tool for caching data with an expiration date. But you always have to have a look on the database the transients are stored in.
Transients can mess up your and your clients database without any benefit. A poor implementation of transients can slow down the database and consequently the webpage instead.

I want to raise awareness for a lightweight way to use the Transients API. Additionally you’ll get an approach to reduce queries and fragmentation of the database.