What is MySQL NodeJS Connection Pooling?

Question

MySQL

Hello, how is the connection pool to the Mysql database in NodeJS different from a simple connection?
var connection = mysql.createConnection(connectionString);
from
varpool = mysql.createPool(...);

Answer 1

I don’t know how it is in NodeJS, but in general the connection pool is just a cache. Instead of each race connecting and disconnecting from the database, they make several connections at once and throw them into the pool (for example, it can be some kind of synchronized queue). If necessary, the thread pulls a connection from the pool, performs some operations with the database, and throws it back. Thus, we get a performance boost.

Answer 2

Restores the connection when it is broken and they say nested queries do not work)