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IDS Forum

Re: How to Monitor Open Connection Tiime???

Posted By: Fernando Nunes
Date: Sunday, 28 November 2010, at 6:12 p.m.

In Response To: Re: How to Monitor Open Connection Tiime??? (Cesar Inacio Martins)

Hello Cesar.
Please see the comments below.

On Sun, Nov 28, 2010 at 3:20 AM, Cesar Inacio Martins <> wrote:

> Hi ,
> I'm working with Miguel on this situation .
> After some debugs with strace, tcpdump, application log we could confirm
> the problem is the DNS reverse.
> But is more of one problem together.
> Let me try explain what happen here:
> 1) the database was started and at this moment the DNS configuration on
> Linux (/etc/resolv.conf) isn't correct, they appoint to old DNS.

This is an "obscure"/grey area. AFAIK Informix does not cache anything. It
only calls gethostbyaddr(). The behavior of this function may differ from OS
to OS.

> 2) The Linux admin, change the resolv.conf and solve the problem with DNS.
> 3) the problem into Informix persist and we cannot bounce the instance
> neither restart the listeners.

You don't mention the version (maybe 11.50.xc7?). If your version allows for
dynamic listener startup you could launch some other(s). Apparently you want
to launch other listeners for the same port. But you dont' have to do
that.... You can create several (not many) listeners on the server and
configure your clients to use a group that includes them. This will spread
the connections for several ports. You could also establish some more
agressive values for INFORMIXCONNTIME and INFORMIXCONRETRY. So you could
workaround this by launching further listeners and appropriate configuration
on the client side...

> 4) with strace / tcpdump we detected the Informix still trying do the
> DNS reverse to old DNS (configured when the database was started)
> 5) The problem of this long time to open connection occur with
> connections of application what incoming from a differ network (remote
> network, behind of a firewall).
> 6) All other connections what occur at same time, suffer a delay ... the
> application what we are monitoring is running on the same network and
> the hostname is in /etc/hosts.

If you have the entries in the /etc/hosts it should not be talking to the
DNS... Unless your settings in /etc/nsswitch.conf are not right.
Please check that also. I'm not sure if a modification on this would require
a bounce in the engine.
If you have doubts please post your /etc/nsswitch.conf

> 7) The instance was configured with 4 MSC VPs since they up. But only
> one VP works and when they "freeze" into the DNS reverse, the others MSC
> VPs just still doing nothing (they should threat the new connections, I
> suppose)

I suppose you're becoming "hanged" on the listeners and not on the MSC VPs.

> So, here we have 2 problems:
> - Informix cache the IP of DNS servers and don't update it...

Already replied... I don't think it's IDS, for the matter is pretty

> - The MSC VP don't parallelize the requests..
> (we already open a PMR for this)

Also replied... I think the problem lies in the listeners, not the MSC

> Reading the manual Admin Guide, I found this:
> "When a poll thread receives a connection request from a client, it
> passes the
> request to the listen thread for the port. The listen thread
> authenticates the user,
> establishes the connection to the database server, and starts an sqlexec
> thread, the
> session thread that performs the primary processing for the client."
> So, based on this quote, the listen thread have the "responsibility" the
> call the MSC VP to do the rest of the job and they "freeze" at the open
> connection, I deduce..
> If I have *more listen threads*, maybe I can soften my problem, where
> the others listeners will work in parallel and *maybe* work with the
> others MSC VPs while the first MSC is freeze over the DNS reverse.
> That's what I think should happen. So, the idea above (several listeners
"grouped" on the client side) could help you.

> Then I found a configuration on the manual what I don't have notice
> before. Configuring more listeners threads for the same service!!!!
> change to
> DBSERVERNAME ifxtest-3 # for 3 listener threads (soctcplst) .
> I tested on v11.70 and works (they create 3 soctcplst)... and appear to
> be available on version 11.50 too . :)

I'm ashamed, but I haven't noticed this...
But now that you mention, I'd say it's there since v10. One of the gurus may
be able to confirm this.

> Back to our situation here, how we can not bounce the instance (to
> update the dbservername), this isn't an available solution at this
> moment. But is very interesting for new configurations!
> My questions:
> 1) Anyone know if more listeners threads will work fine with more MSC
> VPs? (parallelizing)

I suppose so, but I can't give you a definitive answer.

> 2) Know if is stable for production environment? (v11.50 xC7) ?
If you mean several threads for the same service, as I say above I haven't
used it. But if it's there since V10 (needs confirmation) than It should be

But again, I think you could solve this without bouncing the engine. Start
more listeners and use a group in the client side that include some of them.


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


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