Mongoose.js creates multiple connections to MongoDB from one connect() call

Question

I am making a single connection to MongoDB via Mongoose in Node.js Express app:

var express = require(\'express\');
var mongoose = require(\'mongoose\');
mon         


        

Answer 1

That's because Mongoose uses a pool of 5 connections (by default) that are shared throughout your application. For best performance, it's best to just leave them open.

You can alter the default behavior via the options parameter to mongoose.connect. For example:

mongoose.connect('localhost', 'test', { server: { poolSize: 3 }}); // Use 3 connections