Database in c

Question

I tried to write a database in c using structs and writing information in txt files using fopen, fprintf etc...
It says that this way is slower than SQL. Pretty slower..
How to write a database on my own that will be fast using c language?

Answer 1

Look at this:
https://www.sololearn.com/learn/668/?ref=app

And this:
https://en.m.wikipedia.org/wiki/Hash_table

Answer 2

Look up how hash tables work.
Maybe look up how file systems work (or archives), as these allow a fast way to get data from a drive.

Answer 3

Can you explain a little bit more please?