Banks and telcos both had database systems that had zero downtime in 20 years, in some case. Tandem Non-Stop was very real - https://en.wikipedia.org/wiki/NonSt

Banks and telcos both had database systems that had zero downtime in 20 years, in some case. Tandem Non-Stop was very real - https://en.wikipedia.org/wiki/NonStop_(server_computers) https://en.wikipedia.org/wiki/NonStop_(server_computers)