Cannot connect to new DB by tnsname entry.

Question

I created 2 oracle home, /stage/product/10g and /oracle/product/10g. Both are using /oracle as $ORACLE_BASE. I am not sure if this is ok, if the $ORACLE_BASE is not part the access path of $ORACLE_HOME.
Then, I created a database (SID=stage) with $ORACLE_HOME as /stage/product/10g and listener tnsnames.ora. With my oracle logon setting, I can connect to oracle as sqlplus username/password, but I cannot connect as sqlplus username/password@stage. Got the error: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor. I got error: ORA-12560: TNS:protocol adapter error while I am trying to connect from remote server. Where is my problem?
Thanks for help,

Answer 1

Here is the information:
ldrpadxdb01|stage|/home/oracle $ id
uid=101(oracle) gid=105(dba) groups=105(dba),106(oinstall)
ldrpadxdb01|stage|/home/oracle $ env | sort
AGENT_HOME=/oracle/product/agent10g
_=/bin/env
CVS_RSH=ssh
G_BROKEN_FILENAMES=1
HISTSIZE=1000
HOME=/home/oracle
HOSTNAME=ldrpadxdb01
INPUTRC=/etc/inputrc
LANG=en_US.UTF-8
LESSOPEN=|/usr/bin/lesspipe.sh %s
LOGNAME=oracle
LS_COLORS=no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:ex=01;32:*.cmd=01;32:*.exe=01;32:*.com=01;32:*.btm=01;32:*.bat=01;32:*.sh=01;32:*.csh=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31:*.bz2=01;31:*.bz=01;31:*.tz=01;31:*.rpm=01;31:*.cpio=01;31:*.jpg=01;35:*.gif=01;35:*.bmp=01;35:*.xbm=01;35:*.xpm=01;35:*.png=01;35:*.tif=01;35:
MAIL=/var/spool/mail/oracle
OEM_HOME=/oracle/product/agent10g
ORACLE_BASE=/oracle
ORACLE_HOME=/stage/product/10g
ORACLE_SID=stage
PATH=/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/home/oracle/bin:/stage/product/10g/bin:/stage/product/10g/OPatch:/usr/bin/cc:/home/oracle/dba/scripts
PS1=ldrpadxdb01|$ORACLE_SID|$PWD $
PWD=/home/oracle
SHELL=/bin/bash
SHLVL=1
SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass
SSH_AUTH_SOCK=/tmp/ssh-VAItjx8945/agent.8945
SSH_CLIENT=10.10.10.43 58662 22
SSH_CONNECTION=10.10.10.43 58662 10.10.11.175 22
SSH_TTY=/dev/pts/3
TERM=vt100
USER=oracle
ldrpadxdb01|stage|/home/oracle $
ldrpadxdb01|stage|/home/oracle $ lsnrctl status
LSNRCTL for Linux: Version 10.2.0.5.0 - Production on 16-JUN-2011 19:44:32
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=ldrpadxdb01)(PORT=1522)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 10.2.0.5.0 - Production
Start Date 16-JUN-2011 16:08:27
Uptime 0 days 3 hr. 36 min. 5 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /stage/product/10g/network/admin/listener.ora
Listener Log File /stage/product/10g/network/log/listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=ldrpadxdb01)(PORT=1522)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC0)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
--====================
listener.ora
--====================
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /stage/product/10g)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = ldrpadxdb01)(PORT = 1522))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
--=========================
tnsnames.ora
--=========================
STAGE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = ldrpadxdb01)(PORT = 1522))
(CONNECT_DATA =
(SERVICE_NAME = STAGE)
The SID=STAGE
SQL> select * from global_name;
GLOBAL_NAME
STAGE