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Unable to connect to oracle in red hat linux

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Homework and Emergencies Emergency UNIX and Linux Support Unable to connect to oracle in red hat linux
# 1  
Old 01-17-2011
Unable to connect to oracle in red hat linux
Hi Gurus,

I have installed the oracle xpress 10g edition in my red hat linux and saw the message that it has been installed successfully ,but after that I started the database by going through application->database->start database
and after that i open the sql prumt but when i tried to connect by using "system" and the corresponding passowrd ,it is throwing an error.(for error please see below)

Code:
SQL> show user
USER is ""
SQL> conn system
Enter password: 
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory

please guide me how to resolve the issue

operating system details

Code:
[root@dhcppc0 ~]# uname -a
Linux dhcppc0 2.6.18-164.el5PAE #1 SMP Tue Aug 18 15:59:11 EDT 2009 i686 i686 i386 GNU/Linux

it is read hat linux 5

waiting your reply.
longlive
# 2  
Old 01-17-2011
Looks like Oracle did not start in the first place. Check the ps list to verify.

tyler_durden
# 3  
Old 01-17-2011
thanks Tyler,

I saw by using ps -ef|grep oracle
Code:
[biswa@dhcppc0 ~]$ ps -ef|grep oracle
biswa 4761 4685 0 13:29 pts/1 00:00:00 grep oracle

no oracle process is showing

Please guide me how to solve this

---------- Post updated at 04:05 PM ---------- Previous update was at 01:32 PM ----------

Hi ,

I checked with the status command and got the following outputs below
Code:
[root@dhcppc0 ~]# /etc/init.d/oracle-xe status

LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 17-JAN-2011 15:46:39

Copyright (c) 1991, 2005, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
   Linux Error: 2: No such file or directory
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=dhcppc0)(PORT=1521)))
TNS-12545: Connect failed because target host or object does not exist
 TNS-12560: TNS:protocol adapter error
  TNS-00515: Connect failed because target host or object does not exist

please help me to resolve this above issue.

God bless you all.

Moderator's Comments:
Mod Comment Please use code tags.
Last edited by Scott; 01-17-2011 at 07:45 AM.. Reason: Please use code tags
# 4  
Old 01-17-2011
Hello sanjay.login,

Have you defined a database yet or just installed the software? To define the database, you will need to decide all sorts of things, not least the data file sizes and locations (including if they are raw devices or files in the filesystem)

There is a whole procedure to create a database before you can sign on. How much have you got through?





Robin
Liverpool/Blackburn
UK
# 5  
Old 01-17-2011
You'll have to set some environment variables first for SQL*Plus to connect to the correct instance, especially ORACLE_SID. There's a handy script for that in /usr/lib/oracle/xe/app/oracle/product/<version>/server/bin/oracle_env.sh
# 6  
Old 01-17-2011
I suggest you watch this You Tube video on how to install it: How to install Oracle 10g Express on Linux
# 7  
Old 01-17-2011
hi puldi,

the error is not related to env variable setting,i installed in red hat 4 it was working fine the same way i did today for red hat 5 it is not working

the status is saying unable to start the database (in previous post)..

and for your reference the below is the line inside the env.sh script
Code:
ORACLE_HOME=/usr/lib/oracle/xe/app/oracle/product/10.2.0/server
export ORACLE_HOME
ORACLE_SID=XE
export ORACLE_SID
NLS_LANG=`$ORACLE_HOME/bin/nls_lang.sh`
export NLS_LANG
PATH=$ORACLE_HOME/bin:$PATH
export PATH
if [ $?LD_LIBRARY_PATH ]
then
        LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LD_LIBRARY_PATH
else
        LD_LIBRARY_PATH=$ORACLE_HOME/lib
fi
export LD_LIBRARY_PATH
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