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IDS Forum

Re: problematic multiple instance

Posted By: Martin Fuerderer
Date: Monday, 22 May 2006, at 12:26 p.m.

In Response To: Re: problematic multiple instance (ART KAGEL, BLOOMBERG/ 731 LEXIN)

Hi Art,

you are right, of course.

The uniqueness of "service names" in sqlhosts files
is not only required within the same sqlhosts file. As far
as I know it is required for all instances on the same
machine. This is because that name is used to create
an instance specific filename for each SHM listener in
a common directory. Therefore when starting an
instance with a duplicate "service name", it will grab
the SHM connectivity from an already running instance
that uses that same service name by overwriting the
specific file. After that you can connect (via SHM) only
to the newly started instance, but not to the one that
was already running (which is the confusing effect that
you see in this situation).

Martin Fuerderer
IBM Informix Development Munich, Germany
Information Management

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For more please see: wrote on 18.05.2006 18:54:20:

> Another possibility:
> The dummy service/port name you used for the shared memory connections
in the
> sqlhosts file: They have to be unique, should NOT be actual port names
> /etc/services, and MUST be different from any used by another server,
local or
> remote. I've seen all kinds of confusion if this is not followed.
Instances on
> different machines can share the same service name for TCP connections,
> all of the dummy services in a single sqlhosts file must be unique.
> Art S. Kagel
> ----- Original Message -----
> From: Rolando Calfa <>
> At: 5/18 12:51:15
> I have a problem i never saw before and cannot figure out. I need to
have two
> instances running in the same box, so i did the usual thing: created a
> onconfig, added the entries in sqlhosts, set the variables and created
> instance. Everything worked fine until I tried to use dbaccess with the
> instance, it gave me and error 761. I double checked everything and
> again and same thing, so i went to my original instance and tried
dbaccess to
> connect to the ORIGINAL (not the new) instance and gave me a 761, I
> the NEW instance and when i tried dbaccess from the ORIGINAL it told me
> the instance (original, running normally) is off. Somehow, somewhere the

> connections to shared memory are getting mixed, confused, crossed, i
> know. The interesting thing is that all connections using TCP/IP (odbc)
> connecting correctly, and all onstat and onmode command are also working
> they should. Could it be a problem with dbaccess itself? I run a lot of
> scripts and pipe commands to dbaccess, i need this to work. I have
> identical server working with two instances with no problem, but i need
> box so i need to move those instances to this box that is giving the
> I'm running IDS 9.30.UC1 on AIX 4.3.3
> Any thoughts wuold br appreciated.
> Rolando Calfa

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