> Does anybody know how you implement multiversion concurrency control?

I have lectures available on Youtube:

Intro DB Class:

* https://15445.courses.cs.cmu.edu/fall2019/schedule.html#nov-...

Advanced DB Class (with reading list):

* Design Decisions: https://15721.courses.cs.cmu.edu/spring2020/schedule.html#ja...

* Protocols: https://15721.courses.cs.cmu.edu/spring2020/schedule.html#ja...

* Garbage Collection: https://15721.courses.cs.cmu.edu/spring2020/schedule.html#ja...