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8 Jul 11 - Database Trends and Applications - Managing Time Series Data with Informix... Read
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10 February 2010 - The Wall Street Journal - International Business Machines is expanding an initiative to win over students and professors on its products. How do they lure the college crowd?... Read

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IDS Forum

Re: keep-alive in sqlhosts

Posted By: Habichtsberg, Reinhard
Date: Tuesday, 5 September 2017, at 12:53 p.m.

In Response To: Re: keep-alive in sqlhosts (Fernando Nunes)

Fernando, Andreas,

we use Solaris 10 and as you said the interval is 2H. The command to show is /usr/sbin/ndd -get /dev/tcp tcp_keepalive_interval. You will see milliseconds. In our case 7200000.

Yes, we'll try it. k=1 is part of the comma separated options list in fifth column of sqlhosts.


Reinhard Habichtsberg
Dienstleistungsverantwortlicher IT-Rechenzentrum
Solaris- und Datenbanksysteme
Abrechnungszentrum Emmendingen
Tel.: 07641/9201-203

-----Ursprüngliche Nachricht-----
Von: [] Im Auftrag von Fernando Nunes
Gesendet: Dienstag, 5. September 2017 17:17
Betreff: Re: keep-alive in sqlhosts [39810]

It will solve the issue (unless the firewall is configured to ignore it, but I've never seen any case of that).
HOWEVER... the option in Informix side "asks" the OS to send the probes.
When (with which interval), the answer timeout etc. is entirely the OS responsability... and in many situations the defaults are around 2H, and most situations I've seen the firewalls "kill" the connections after 1H...
if you find yourself into this situation, the feeling you'll get it that it didn't work... when in fact it's just misconfiguration.

You should check the OS documentation on how to configure the keep alive functionality... I've been involved in linux and hp-ux in the past... but if you need assistance, please tell us your OS.

Note that after you change SQLHOSTS you need to at least restart the listener (if your Informix version has this functionality). Checking if the option is in effect can be trivial (lsof) in most operating systems, but is nearly a nightmare on Linux... one option is to compile and load a kernel module.... but I always have the feeling there's another option, which I never remember... maybe some obscure option of netstat... another option would be to sniff the trafic...


On Tue, Sep 5, 2017 at 12:59 PM, Habichtsberg, Reinhard <> wrote:

> Hi all,
> we have the problem that longer lasting remote client sessions on
> informix databases are interrupted by the firewalls, particulary when
> no packets were sent. It's possible to configure the port on the
> firewall to extend the time before the connection is interrupted. The
> disadvantage is that you never know if the time you choose is long
> enough or if you found all database-server ports.
> We found a parameter which can be set in the sqlhosts file of the
> server, if I understand aright.
> >From
> To enable the keep-alive option for an Informix database server TCP
> port, specify k=1 in the fifth column of the related line of the
> server in the sqlhosts file. The following table is a summary of
> possible setting of the keep-alive option in an IBM Informix server sqlhosts file and its results.
> k setting in the options field Result
> k=0 Disables keep-alive feature: this means the local TCP driver does
> not check whether a connection is active. For example, from a PC, if
> you make a connection to an IBM Informix database server, and then
> switch off the PC, then netstat -a and onstat -u shows the TCP and
> database network connection are still established. The TCP connection
> is never terminated until stopping and restarting the Informix server.
> k=1 Enables the keep-alive feature
> My question: Does this setting solve the issue? Or can it cause
> unexpected side-effects.
> Thanks,
> Reinhard Habichtsberg
> Dienstleistungsverantwortlicher IT-Rechenzentrum
> Solaris- und Datenbanksysteme
> Abrechnungszentrum Emmendingen
> Tel.: 07641/9201-203
> ************************************************************
> *******************
> Forum Note: Use "Reply" to post a response in the discussion forum.

Fernando Nunes
My email works... but I don't check it frequently...

Forum Note: Use "Reply" to post a response in the discussion forum.

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