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IDS Forum

Re: keep-alive in sqlhosts

Posted By: Andreas Legner1
Date: Tuesday, 5 September 2017, at 9:40 a.m.

In Response To: keep-alive in sqlhosts (Habichtsberg, Reinhard)

This sqlhosts option controls options for newly created sockets.

man setsockopt:

SO_KEEPALIVE

Keeps connections active by enabling the periodic
transmission of messages, if this is supported by the protocol. This option
takes an int value.

If the connected socket fails to respond to these messages, the
connection is broken and threads writing to that socket are notified with a
SIGPIPE signal. This is a Boolean option.

Reading this, I'd say definitely worth a try.

BR,
Andreas

From: "Habichtsberg, Reinhard" <RHabichtsberg@arz-emmendingen.de>
To: ids@iiug.org
Date: 09/05/2017 02:00 PM
Subject: keep-alive in sqlhosts [39807]
Sent by: ids-bounces@iiug.org

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 http://www-01.ibm.com/support/docview.wss?uid=swg21160988

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

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