First video is the computation of Fibonacci (42) and seconds the prime numbers < 250.001

Uber uses Docstore an in-house, distributed database built on top of MySQL, serving 40 Million Reads Per Second in a dataset of tens of Petabytes.

https://www.uber.com/en-IN/blog/how-uber-serves-over-40-million-reads-per-second-using-an-integrated-cache