tl;dr:"Most companies that invest in an online analytical processing (OLAP) database like ClickHouse originally used an online transaction processing (OLTP) stack like MySQL or Postgres." Despite the two being built for different purposes, most companies leverage features in both during their scaling period. The author compares the two technologies here.
tl;dr:One of the biggest tools to arrive last decade was session recording (SR) – a screen-recording-like service that tracked a user’s activity. Typically, SR was popular with marketers and product managers as a tool to learn more about a user’s experience. Most SR providers will pledge that their products do not impact page performance - this post explores that hypothesis.