I have $5 droplet. I connect my server with ServerPilot. Before installing wordpress in serverpilot I want to replace MySql with either MariaDB or PerconaDB.
What is the procedure to replace Mysql in serverpilot?
I read this tutorial,
https://www.digitalocean.com/community/tutorials/how-to-install-a-fresh-percona-server-or-replace-mysql
my question is will it work even if I use serverpilot?
MariaDB & Percona are drop-in replacements for MySQL -- you should be able to remove MySQL and install either one without any issues, though ServerPilot does do things a little differently :-).
To make sure removing MySQL won't break something on their end, I'd definitely recommend getting in touch with them before you try.
That said, running a full stack on 512MB may be problematic. We normally recommend 1GB as MySQL requires quite a bit of RAM (even if you swap out to MariaDB or Percona). This will generally prevent the all-too-common service crashes (due to MySQL not being able to acquire enough RAM). Even our one-click application for WordPress is set to require 1GB (up from the previous 512MB).