Re: DB access speeds, App(linux)<->PG(linux) vs App(linux) <->MSSql(Windows)

>>1) The same schema, data on both DB servers?
Yes, identical
>>2) Are they the same apps?
Yes, the same. The only diff is the db connect.
>>3) What are the apps doing?
The vast, vast majority are small queries, often run inside large programming loops.

>>If you fire off lots and lots of small querys that hit an index and return very fast, then native is the way to go.
By this are you implying that there is more overhead using ODBC vs Perl DBI-DBD ? If so, any guess, percentage wise, of how much slower it would be? 50% slower? 2x? Other?

Some (who really don't understand DB mechanics, or even know what odbc is) are telling me that there is no difference. I say there is, but this is an intuitive response. I'm trying to tap more experienced people for something more solid.

-----Original Message-----
From: Andy Colson [mailto:andy(at)squeakycode(dot)net]
Sent: Wednesday, June 24, 2015 10:10 AM
To: Gauthier, Dave; Postgres General
Subject: Re: [GENERAL] DB access speeds, App(linux)<->PG(linux) vs App(linux) <->MSSql(Windows)

On 6/24/2015 8:44 AM, Gauthier, Dave wrote:
> Hi: I'm trying to get a 10,000 ft understanding of the difference in
> DB access speeds for two different scenarios...
>
> Scenario 1: Apps are on linux. PG DB is on linux (different server
> than apps)
>
> Scenario 2: Apps are on linux. MSSql DB is on Windows (obviously a
> different server)
>
> The apps are typically perl scripts using Perl DBI.
>
> I'm thinking that since perl has a DBD driver for PG, that would be
> faster than going through ODBC to get to the MsSQL DB, but I'm not
> sure about that.
>
> Any insights/guesses ?
>
> Thanks in Advance.
>

I think it'll depend on your usage.

If you fire off one really big analytic sql that chews on a huge table and does stats and counts, then odbc vs native will make no difference.

If you fire off lots and lots of small querys that hit an index and return very fast, then native is the way to go.

-Andy