Contents
What is connection pool in node js?
js Connection Pooling. The Node. js driver supports connection pooling. Connection pooling allows your application to reuse existing connections by automatically saving the connection to a pool so it can be reused, rather than repeatedly creating a new connection to the SAP HANA database server.
Can I use connection pooling in node js?
I have observed that connection pooling is a critical engineering decision which is easily ignored while developing node. js applications. While interacting with any external resource such as MySQL, PostgreSQL, Redis or MongoDB, each of it requires a connection pool for any sizeable node. js application.
Is Nodejs good for database?
Node. js typically supports all database types, regardless of whether they’re SQL or NoSQL. Nevertheless, the choice of a database must be made based on the complexity and purposes of your application. In this article, we will take a closer look at SQL and NoSQL databases, as well as at their practical examples.
What is difference between pool and client Postgres?
You have two options that you can connect to a PostgreSQL server with the node-postgres module. One of the options is to use a single client. The other method is to use a connection pool. However, if your application is using the database very frequently, the pool will be a better option than using a single client.
What is connection pooling in MySQL?
The MySQL Connection Pool operates on the client side to ensure that a MySQL client does not constantly connect to and disconnect from the MySQL server. It is designed to cache idle connections in the MySQL client for use by other users as they are needed.
How to change database in connection pool in NodeJS?
If you want to change database, you need to do it on the connection, not the pool. Instead of using the shorthand pool.query form, you’d do pool.getConnection / conn.changeUser / conn.query / conn.release.
When to call pool.release ( ) in Node.js?
If you call pool.getConnection (), you must call connection.release () when you are done using the connection. Otherwise, your application will get stuck waiting forever for connections to be returned to the pool once you hit the connection limit. For simple queries, you can use pool.query ().
How to get a connection in MySQL pool?
If you just want to get a connection add the following code to your module where the pool is in: var getConnection = function (callback) { pool.getConnection (function (err, connection) { callback (err, connection); }); }; module.exports = getConnection; You still have to write getConnection every time.
How many connections can be made in a connection pool?
If you configure the pool to allow up to 100 connections, but only ever use 5 simultaneously, only 5 connections will be made. However if you configure it for 500 connections and use all 500 they will remain open for the durations of the process, even if they are idle!