I can increase the PHP limit my server to 3GB?

Hello!

My site database has 1.9 GB.

PHP limit my server is 512 MB.

This may be causing my site problems?

I can increase this limit to 3000 MB? I can cause some trouble for doing this?

The limits of my server:

CPU 4 Cores
RAM 14 GB
Disk Storage: 1000 GB

It's not clear what you are asking about.

If you are having some sort of a problem, you need to determine what's causing it. Just making changes that don't have anything to do with the problem won't solve anything.