Learning database systems now. Andy Pavlo made two of his great classes public. Class materials and videos are online. Thomas Neumann's papers are also really good.

- https://15445.courses.cs.cmu.edu/fall2019/schedule.html - https://15721.courses.cs.cmu.edu/spring2020/schedule.html - https://umbra-db.com/ - https://hyper-db.de/