How does connection pooling work in Node.js?

How does connection pooling work in Node.js?

Connection pooling in Node.js allows multiple database connections to be reused, improving performance and resource management.

What are the benefits of using connection pooling?

The benefits include reduced latency, better resource utilization, and improved application scalability.

Can you show me an example of implementing connection pooling?

Sure! You can use libraries like mysql2 or pg for PostgreSQL. Here's a simple example using mysql2:

const mysql = require('mysql2/promise');

const pool = mysql.createPool({
  host: 'localhost',
  user: 'root',
  database: 'test',
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0
});

async function queryDatabase() {
  const [rows] = await pool.query('SELECT * FROM users');
  console.log(rows);
}

queryDatabase();

Are there any downsides to using connection pooling?

Yes, potential downsides include increased complexity and the need to manage connection limits to avoid overwhelming the database.