How I can have two different connection pools for two different databases?

It is possible to set pool size in pg.defaults. However let’s say I have two databases and two separate connection strings for them:

postgres://localhost/db1
postgres://localhost/db2

And I want to have two different pool sizes for each of them. For example max 20 connections for db1 and max 100 connections for db2. How I can do that? Changing pool size in pg.defaults will set it globally…

[rpedela]

I don’t think it is supported. I recommend using pgbouncer for connection pooling. It is more flexible, faster, mature than the node-postgres connection pooling. There are other options too from the Postgres community. If you use pgbouncer, then you can open/close single connections in your JS code without any significant performance penalty.

[rpedela]

You configure pgbouncer, have it run as a daemon, and then you make Postgres queries to pgbouncer (default port 6543) in Node.js like normal without using the pooling code like the example in the README:

var pg = require('pg');

var conString = "postgres://username:password@localhost:6453/database";

var client = new pg.Client(conString);
client.connect(function(err) {
  if(err) {
    return console.error('could not connect to postgres', err);
  }
  client.query('SELECT NOW() AS "theTime"', function(err, result) {
    if(err) {
      return console.error('error running query', err);
    }
    console.log(result.rows[0].theTime);
    //output: Tue Jan 15 2013 19:12:47 GMT-600 (CST)
    client.end();
  });
});