Question

why connect to postgres over internet or VPN slower than sql server ?
I have test

    DateTime now0 =  System.DateTime.Now;
    string sqlconnectsrting = "server=xxx.xxx.xxx.xxx;database=pubs;uid=sa;pwd=";
    for (int i = 0; i < 1000; i++)
    {
        SqlConnection connect = new SqlConnection(sqlconnectsrting);
        connect.Open();
        connect.Close();
    }
    System.DateTime now1 = System.DateTime.Now;
    Console.WriteLine(String.Format("SQL Connect time : {0}", now1 - now0));

    now0 = System.DateTime.Now;
    string npgconnectsrting = "Server=xxx.xxx.xxx.xxx;Port=5433;User Id=postgres;Password=postgres;Database=hr_data;";
    for (int i = 0; i < 1000; i++)
    {
        NpgsqlConnection connect = new NpgsqlConnection(npgconnectsrting);
        connect.Open();
        connect.Close();
    }
    now1 = System.DateTime.Now;
    Console.WriteLine(String.Format("Postgres Connect time : {0}", now1 - now0));

When connect is localhost they are similar, but when connect is over internet. SQL connect take 1-5s but postgres take 3-7 minutes.
Is there anyway to fix this?

Tuan Hoang Anh

Answer 1

What’s the setting for SSL?

SHOW ssl;

Creating an SSL-connection will be slower, even when you actualy don’t use SSL. Turn it off if you don’t need the extra security.

3 to 7 minutes is about 180 to 420 seconds, if you create 1000 connections, it will “only” take 0.18 to 0.42 seconds for each connection. SQL Server is not going to make a 1000 connections within 1 to 5 seconds over a network, the network will be too slow. Sounds like a connection pool that let you believe you have created a new connection.