Re: 12170/ORA-12535/12537

  • From: Kellyn Pedersen <kjped1313@xxxxxxxxx>
  • To: rajendra.pande@xxxxxxx, oracle-l@xxxxxxxxxxxxx
  • Date: Wed, 13 Oct 2010 14:25:05 -0700 (PDT)

The network guys are a bit "gun shy" right now after their network 
being targeted for quiet some time now.  Due to this, I am not getting any 
information on what changes might have been done to the network and I have no 
visibility into it myself... :(

From: "rajendra.pande@xxxxxxx" <rajendra.pande@xxxxxxx>
To: kjped1313@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Sent: Wed, October 13, 2010 2:11:47 PM
Subject: RE: 12170/ORA-12535/12537

Everything that I read here – to me indicates a network item.
Have they introduced anything that has a timeout feature – powerbroker, any 
other pam module 

But that still does not explain these parameters and the values
But then I am not fully conversant with how these work really to affect any 



From:oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Kellyn Pedersen
Sent: Wednesday, October 13, 2010 3:45 PM
To: oracle Freelists
Subject: 12170/ORA-12535/12537
I am officially stuck and looking for some help, (please, please, please... )
We have specific configurations in our sqlnet.ora files on all our database 
servers that have been present since the inception of Oracle at my company-

About five weeks ago, People started to complain about disconnects, (errors 
codes seen in the subject line above...) from two of our main dblinked 
and one of our duplicates failed due to 12170 errors, both in the and databases.  I dug in and ended up having to put in the oddest values 
get the disconnects to stop in the sqlnet.log and  log.xml, along with making 
the users content with no more failures.  It took another turn for the worse 
this last week and I had to "tweak" the numbers just a bit more to get a 
duplicate to complete from one production server to another.  Here is the 
current configuration for the SQLNET.ORA files:
OK, we can all be honest here, the numbers I've used are outrageous, but they 
are the only thing that's stopped system processes from failing, where for the 
first week, it was 24X7 with complaints... and we all know the database is 
guilty until proven innocent!
I have tested just about every app we have, traced back every disconnect, gone 
through every log back to user and even used my own connections as guinea pigs, 
testing out each parameter and each value with different system processes to 
come up with the final values.
Since putting this into place, we continue to have one or two disconnects at 
client side in the office per day.  The disconnects do not calculate to what I 
have in the timeouts, which makes me wonder if I'm just fighting a losing 
here.  It's not consistent across the client base, ether.  I have only two 
developers that are losing connectivity consistently,from PL/SQL Developer, 
we're talking just a minute or so after they have gone inactive and many of 
do not show up in the logs at all.  They are using the network client TNS and 
SQLNet files, so they are using the files configured to match what I have on 
server, nothing local that could be tripping them up.  I myself was 
from every SSH session I had open just yesterday morning and no one seems to 
understand *HOW* it happened or what went wrong, but that they were putty 
sessions and that this has happened to these two users for their diconnects 
time to time, (they do not use Putty sessions often...) makes me wonder some 
The network guys are saying they have changed nothing, but we just had a 
multi-server MySQL farm go in 5 weeks ago and the way we move and how much data 
we move, I have a hard time believing someone didn't sneak something in on 
Anybody have any ideas or recommendations?   I'm pulling my hair out here and 
honestly, other than a small change recommended by Oracle, personally I've 
always felt that this type of tweaking was either a problem with the network or 
a problem with code that needed to be tuned so the waits were not so severe to 
cause connectivity loss...
Kellyn Pedersen
Sr. Database Administrator
I-Behavior Inc.
"Go away before I replace you with a very small and efficient shell script..."


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