Its your busiest day of the year and the website has crawled to a halt and finally crashed& and it was all because you did not understand how MongoDB uses memory and left your system open to cluster instability, poor performance, and unpredictable behavior. Understanding how MongoDB uses memory and planning for its use can [&]

https://www.percona.com/blog/2021/05/24/mongodb-tuning-anti-patterns-how-tuning-memory-can-make-things-much-worse/