MONGO-DB CONNECTION POOLING

Connection Pooling is a technique used to manage database connections efficiently. Instead of opening a new connection to the database each time one is needed (which can be slow and resource-intensive), connection pooling maintains a collection (or "pool") of open connections that can be reused. When an application needs a connection, it can borrow one from the pool, and when it's done, it can return the connection to the pool for others to use.

Why Connection Pooling is Important

• Performance: Opening and closing connections repeatedly can slow down your application. Reusing connections reduces the overhead.
• Resource Management: Databases have a limit on the number of simultaneous connections they can handle. Connection pooling helps control and optimize connection usage.
• Scalability: Pooling makes it easier to handle higher levels of traffic by reducing connection setup time.

Mongoose does not handle connection pooling automatically. It handles connection management, but connection pooling needs to be set up manually.

To handle connection pooling in Mongoose, you can use a separate library called mongodb (the native MongoDB driver for Node.js). Mongoose internally relies on this library, and you can access the underlying mongodb driver to configure connection pooling.

Here's an example of how you can manually set up connection pooling in Mongoose using the mongodb driver:

1. Install the mongodb package:

npm install mongodb
        

1. Set up the connection options and connection pool size:

const mongoose = require('mongoose');
const { MongoClient } = require('mongodb');

const mongoOptions = {
  useNewUrlParser: true,
  useUnifiedTopology: true,
};

const mongoConnectionUrl = 'mongodb://localhost/mydatabase';
const poolSize = 10;

mongoose.connect(mongoConnectionUrl, mongoOptions, (error) => {
  if (error) {
    console.error('Mongoose connection error:', error);
  }
});

const mongoClient = new MongoClient(mongoConnectionUrl, mongoOptions);
mongoClient.connect((error) => {
  if (error) {
    console.error('MongoDB connection error:', error);
  } else {
    mongoose.connection.db = mongoClient.db(); // Set the MongoDB connection for Mongoose
  }
});
        

By setting mongoose.connection.db to the MongoDB connection obtained from mongoClient, you're instructing Mongoose to use the manually configured connection pool.

Please note that this method involves accessing the underlying mongodb driver and manually managing the connection pool. It's not the default behavior of Mongoose, which handles connection pooling automatically when used without explicit customization.