How to host two sites with one database without crashes?

Question

PHP

There are two sites that use one database and one location folder, because the engine is one for two.
One is the main one, the other is for importing.
The second site is placed on a subdomain and on a separate php socket.
However, all the same, when there is a heavy load on the second site, the main one does not load / crashes.
How to make sure that when loading from the second site, it mostly loads in normal mode?
I can connect to the database through the console, but the sites are not loaded.
When importing hung on Gearman, the sites did not lie.

Answer 1

Well, then look, you need to connect php scripts to mysql database. But your regular hosting may not be able to handle such a load, so I highly recommend starting such a project with a vds server. I personally post here and everything is ok.

Answer 2

Let's start with what engine are you using?