Examples or tutorials on writing key-value stores?

Question

Database

Hello!
Are there any tutorials or examples of small key-value stores? I'm interested in working with the disk and how to store data.

Answer 1

How can I push data into one file

https://habr.com/ru/post/223449/
It depends on the tasks you are solving.
I'll try to explain on the fingers.
As you can see, the optimization is different, and diametrically. However, there is no "correct" optimization.