Re: Connection delays causing problems.
- From: "Charles Hooper" <hooperc2000@xxxxxxxxx>
- Date: 17 Jul 2006 11:48:13 -0700
Maxim Demenko wrote:
Ed Prochak schrieb:
The problem: ORACLE connections sometimes take tens of seconds to come
up. This is true whether the connection is via sqlplus, ACCELL
application program, or thru JAVA web application program.
Environment:
Clients and servers running LINUX 2.4.21
Over 150 clients running ACCELL applications.
A similar number connect via the web
ORACLE Clients:
SQL*Plus: Release 10.1.0.2.0 - Production on Mon Jul 17 13:34:00 2006
Web clients come thru JBOSS
Release ID: JBoss [WonderLand] 3.2.3 (build: CVSTag=JBoss_3_2_3
date=200311301445)
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
The server database has just been upgraded to release 10.2 from 10.1
but from what we can tell, this problem also occurred on connecting to
the 10.1 release.
The delay happens at connection time so no SQL query is involved. I can
tune SQL, but I have no idea what oracle settings might help or hurt
the login time. The way our ACCELL applications are written, they
make many short connections to our centralized Oracle DB. Typical
queries are simple lookups in reference tables. Most of the
application data is held in a local Database at the sites. (I just
found out that tnsping also shows the delay.) Our DBA is doing a search
in ORACLE, but I thought I'd try to get some insights from this group.
So any suggestions of where to look or any outright solutions are
welcome.
Thanks,
Ed
here's a sample ping:
tnsping MYID
TNS Ping Utility for Linux: Version 10.1.0.2.0 - Production on
17-JUL-2006 13:56:34
Copyright (c) 1997, 2003, Oracle. All rights reserved.
Used parameter files:
/home/oracle/product/10.1.0/client_1/network/admin/sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS =
(PROTOCOL = TCP)(HOST = hostname.COM)(PORT = 1521))) (CONNECT_DATA =
(SID = myid)))
OK (9570 msec)
Ten seconds is way too long.
The most common causes of such delays, which i know - are the DNS
issues. You should check your nsswitch.conf, resolv.conf and hosts
files. Maybe , however , you don't see any obvious misconfiguration -
then you should probably trace. An excellent document how to read Net 8
trace file is the Note 156485.1
Best regards
Maxim
If he is running into DNS problems, he should be able to use Ethereal
on his Linux boxes to see where the packets are going, and what the
responses to those packets are.
In dedicated server mode, the listener on Linux/Unix tries to spawn an
additional process when a client connects - this may account for some
of the delay. Did you adjust the kernel memory parameters? What does
the following show at a prompt:
cat /etc/sysctl.conf
Charles Hooper
PC Support Specialist
K&M Machine-Fabricating, Inc.
.
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- Connection delays causing problems.
- From: Ed Prochak
- Re: Connection delays causing problems.
- From: Maxim Demenko
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