Re: Postgres 9.4 + unixODBC on Centos 6.5 problem connecting localhost postgres instance with isql ODBC commandline client - SOLVED

Hi Tom

Thanks for the answer.

Yes, it turned out to be an incompatibility of some kind.

I downgraded the Postgress instance to 9.0 and immediately everything started working.

I suspect that the very old unixODBC (2.2.14) that ships with a fully updated Centos 6.5 (also old) is simply incompatible with the psqlodbc driver shipped with Postgres 9.4

Everything is now working fine on Postgres 9.0

Maybe put up a note somewhere relevant that (maybe) Centos 6.5 stock unixODBC cannot talk to Postgres 9.4's ODBC driver?

9.0 definitely works like a charm (at least in my Centos 6.5 instance here.)

Thanks for the time you took to assist with this.

Kind regards,

-----Original Message-----
From: Tom Lane [mailto:tgl(at)sss(dot)pgh(dot)pa(dot)us]
Sent: Wednesday,July 22, 2015 03:38 PM
To: Stefan Viljoen
Cc: pgsql-odbc(at)postgresql(dot)org; Devrim GÃœNDÃœZ
Subject: Re: [ODBC] Postgres 9.4 + unixODBC on Centos 6.5 problem connecting localhost postgres instance with isql ODBC commandline client - SOLVED

"Stefan Viljoen" <viljoens(at)verishare(dot)co(dot)za> writes:
> I managed to solve this on Centos 6.5 by downgrading to Postgres 9.0
> and ODBC is now working fine:

Hm. That should not have fixed anything, because there for sure have not been any basic protocol-level changes since 9.0.

Looking back at your earlier messages, I notice that you are using the Red Hat-supplied unixODBC package:

> # yum list installed | grep ODBC
>
> unixODBC.x86_64 2.2.14-14.el6 @base
> unixODBC-devel.x86_64 2.2.14-14.el6 @base

but the Postgres ODBC driver seems to be coming from PGDG:

> # yum list installed | grep postgres
>
> postgresql94.x86_64 9.4.4-1PGDG.rhel6
> postgresql94-contrib.x86_64
> postgresql94-devel.x86_64
> postgresql94-docs.x86_64
> postgresql94-libs.x86_64
> postgresql94-odbc.x86_64
> postgresql94-odbc-debuginfo.x86_64
> postgresql94-server.x86_64

An all-Red-Hat solution for this would look like

Installing:
postgresql-odbc x86_64 08.04.0200-1.el6 rhel-6-workstation-rpms 267 k
Installing for dependencies:
postgresql-libs x86_64 8.4.20-3.el6_6 rhel-6-workstation-rpms 202 k
unixODBC x86_64 2.2.14-14.el6 rhel-6-workstation-rpms 378 k

So now I'm suspicious that there's some incompatibility between the ODBC driver that Devrim is shipping and the admittedly-pretty-old unixODBC manager in RHEL6.

(I haven't worked for Red Hat in a couple of years, but I'm fairly sure that when I left, their ODBC packages would still talk to current Postgres server versions, because I recall testing that. However, I never tested the combination of their unixODBC with the PGDG packaging of the ODBC
driver...)

regards, tom lane