How to organize mongoose + socket.io if calls to the database can be every second?

Question

PHP

Hello!
Applications will be from node + vue + mongoose + socket.io
The problem is that requests to the database can be every second and there should be a quick response to the client, but I don’t know how best to organize
I’m afraid of overloading the database
Tell me something?

Answer 1

Your constructor is not declared correctly. Or remove or refactor to __construct

function MYSQL_SESSIONS()
    {
    }

Answer 2

To begin with, determine what the queries will be (by which fields documents will be selected from the database and by which fields the results will be sorted), and what will be the frequency of changes to this data. Index these fields.
Dock by indexes in monge
If the data does not change every second, then you can introduce additional caching using memcached or Redis