RE: 12170/ORA-12535/12537

  • From: <rajendra.pande@xxxxxxx>
  • To: <kjped1313@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
  • Date: Wed, 13 Oct 2010 16:11:47 -0400

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 timeouts 



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 databases 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 to 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 the 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 battle 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 them 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
the server, nothing local that could be tripping them up.  I myself was
disconnected 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 from time to time, (they do not use Putty
sessions often...) makes me wonder some more...


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 them...



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


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