Re: DBD::Sybase with host process disconnect errors when run from linux

This error usually happens when the client goes away without properly 
closing the connection.
You may be getting this because of a tcp_keepalive setting that is too low 
on the db server side.

What happens when you connect from the linux host with isql and issue the 
same query?

Michael




Internet
[email protected]@peppler.org - 03.10.2006 20:22
 
Sent by:        [email protected]
To:     sybperl-l
cc: 
Subject:        DBD::Sybase with host process disconnect errors when run 
from linux




Has anyone come across this problem?  Any help would be appreciated (it's 
driving me bananas).  When I run a simple connect to a sybase server from 
a linux box, the connect creates a "host process disconnect" message in 
the Sybase error log.  When I run the same script on a sun solaris box, no 
message in the Sybase errorlog.  Do you think upgrading it to the latest 
DBD version would help?

Dan 

Details: 

Script runs from linux box with DBD::sybase, Sybase.pm,v 1.4, linux 
version Linux 2.4.21-27.0.2.ELsmp #1 SMP 
Connects to Sybase 12.5.2 ESD2, running on Sun solaris 2.8 

Code: 

my $dbh = DBI->connect("dbi:Sybase:server=$status_server", $login, 
$password, {PrintError => 1}); 

if ($dbh) { 
   $query = "select xyz from db..table where status = 0"; 
   $hash = $dbh->selectall_hashref($query, "server_name"); 
   $dbh->disconnect; 

   while (my ($k, $v) = each(%$hash)){ 
   print "$k => $v\n"; 
   } 
} 

Sybase error log: (this only happens during the "DBI-> connect" command) 

1st time running script 
01:00000:02914:2006/10/03 12:55:02.92 kernel  Cannot read, host process 
disconnected: linux-db-1.1515.mtvi.com 37876 spid: 2914

2nd time running script 
01:00000:02178:2006/10/03 12:55:03.07 kernel  Cannot read, host process 
disconnected: linux-db-1.1515.mtvi.com 37876 spid: 2178

Notes:  The code returns valid results from both linux and sun; it's just 
those darn messages in the errorlog that is making the errorlog grow 
waaaaaay too much. 



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