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IDS Forum

Re: How to Monitor Open Connection Tiime???

Posted By: Cesar Inacio Martins
Date: Saturday, 27 November 2010, at 10:20 p.m.

In Response To: Re: How to Monitor Open Connection Tiime??? (Fernando Nunes)

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.
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.
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.
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

So, here we have 2 problems:
- Informix cache the IP of DNS servers and don't update it...
- The MSC VP don't parallelize the requests..
(we already open a PMR for this)

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.

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 . :)

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)
2) Know if is stable for production environment? (v11.50 xC7) ?


On 11/24/2010 07:39 PM, Fernando Nunes wrote:
> On Wed, Nov 24, 2010 at 8:13 PM, Miguel Carbone
> <>wrote:
>> Fernando
>> Thanks, I did some tests and I realize that the msc vp stays running when
>> the issue happens. How much time the msc VP stays running are how much time
>> are incceased at the open connection time.
>> My connection time is something near 0.002 sec and goes to 3.0 sec
>> I will try to understand what this msc VP is doing to take too much time...
>> Miguel
> If you're running on Linux you can use strace command (I think you'll
> require root, but I'd have to check).
> Note that while stracing a process it will work slower...
> I would have to revisit the subject but I think MSC will do the reverse
> DNS... So again... keep an open mind when you say you're not using DNS :)
> A short strace will show important information...
> As a side note, it looks like you're making a connection for each client
> request. That is a very good idea, so even if you solve this issue you
> should review that way of working... Or at least upgrade to 11.7 and use
> Regards.

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