Ora-12154 VMWare Server Number of virtual CPUs

Installation of Oracle 10g completed successfully with 2 virtual CPUs configured. Listener and database services start automatically and the system behaves normally.
Restart VM, modify the Virtual CPU from 2 to 1, Listener and database services show as started, but the databases does not start. The alert log shows no attempt was made to start the db. Listener.log shows ora-12154.
A manual attempt to start of the database shows ora-12154. (via sqlplus)
Restart VM, switch back to 2 CPUs, (making no configuration changes to the listener.ora, tnsnames.ora or anything else) and the database starts ok.
Any ideas on how many Virtual CPUs configured could be affecting the start of the db?
Thanks!
Configuration:
OS Version: Windows 2003 Server
Oracle Version : 10.2.0.4 Enterprise Edition
Virtual CPUs: 2
Virtual Memory: 1G

Hi user624886
Can you please read that in metalink
Doc ID: Note:114085.1
Subject: TROUBLESHOOTING GUIDE: TNS-12154 TNS:could not resolve service name
Did you set proper tnsnames.ora file?
Here are the steps:
http://download-uk.oracle.com/docs/cd/B19306_01/network.102/b14212/troublestng.htm#CEGJAGGH
and also:
http://ayyudba.blogspot.com/2007/11/good-article-on-ora-12154.html

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TNS error ORA-12154 : can connect to one server but not to another.

Hello,
I have a Forms 6.0 application running on a Solaris box. It connects
fine to an Oracle 9.0 server but fails with ORA-12154 when trying to
connect to Oracle 10g running on a different server.
'sqlplus' can connect fine to both servers .
'tnsping'result is succesful from the Solaris client to both servers.
Configuration details are as follows. (IP Addresses have been
sanitised. I've included the client side listener and also entries for
the 'local' Oracle 8i server running on the Solaris 'client' although
I think some of this may be not relevant):
1. Connecting to Server 9.0 : application CAN connect successfully:
a. application URL
http://host_ip_address:7778/dev60cgi/if60cgi?config=rack : application
runs successfully
b. client's formsweb.cfg excerpt:
[rack]
pageTitle=yadayada
form=login01
userid=user/pass@nn_rackspace
archive=f60all.jar, oracle_ice-4_03_1.jar
c. client's tnsnames.ora excerpt (local services not excluded):
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = sun1)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = orcl)
RR =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = sun1)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = RR)
NN_RACKSPACE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 1.2.33.44)(PORT =1521))
(CONNECT_DATA =
# (SERVER = DEDICATED)
(SERVICE_NAME = QQ1.QONNECTIS.COM)
NN_QQ3 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 2.3.44.55)(PORT = 1521))
(CONNECT_DATA =
# (SERVER = DEDICATED)
(SERVICE_NAME = orcl.qonnectis.com)
NN_QQ3.qonnectis.com =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 2.3.44.55)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 2.3.44.55)(PORT = 1521))
(CONNECT_DATA =
# (SERVER = DEDICATED)
(SERVICE_NAME = orcl.qonnectis.com)
d. client's sqlnet.ora: contains ONLY:
NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES, HOSTNAME)
e. client's listener.ora excerpt:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /space/oracle/OraHome1)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = orcl)
(ORACLE_HOME = /space/oracle/OraHome1)
(SID_NAME = orcl)
(SID_DESC =
(GLOBAL_DBNAME = NN)
(ORACLE_HOME = /space/oracle/OraHome1)
(SID_NAME = NN)
(SID_DESC =
(GLOBAL_DBNAME = RR)
(ORACLE_HOME = /space/oracle/OraHome1)
(SID_NAME = RR)
f. remote server's tnsnames.ora excerpt:
QQ1.QONNECTIS.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS =
(PROTOCOL = TCP)
(HOST = qanasta1.qonnectis.com)
(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = QQ1.qonnectis.com)
QQ1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)
(HOST = qanasta1.qonnectis.com)
(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = QQ1)
QQ3.QONNECTIS.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 2.3.44.55)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = orcl.qonnectis.com)
g. remote server's sqlnet.ora contains only:
NAMES.DEFAULT_DOMAIN = qonnectis.com
NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES, HOSTNAME)
h. remote server's listener.ora excerpt:
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)
(HOST =qanasta1.qonnectis.com)
(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /opt/oracle/product/9.2.0.1.0)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = QQ1.qonnectis.com)
(ORACLE_HOME = /opt/oracle/product/9.2.0.1.0)
(SID_NAME = QQ1)
i. on Solaris client, tnsping nn_rackspace : succeeds
j. on Solaris client, sqlplus user/pass@nn_rackspace: succeeds
k. on server, Oracle server processes have names like ora_d000_QQ1.
l. on server, Oracle connected listener processes show up in ps
listing like oracleQQ1 (LOCAL=NO)
m. On server, lsnrctl status reports amongst other things
Service "QQ1.qonnectis.com" has 2 instance(s).
Instance "QQ1", status UNKNOWN, has 1 handler(s) for this service...
Instance "QQ1", status READY, has 1 handler(s) for this service...
2. Connecting to Server 10g : application does NOT connect successfully:
a. application URL
http://host_ip_address:7778/dev60cgi/if60cgi?config=rack2
b. client's formsweb.cfg excerpt:
[rack2]
pageTitle=yadayada
form=login01
userid=user/pass@nn_qq3
archive=f60all.jar, oracle_ice-4_03_1.jar
c. client's tnsnames.ora excerpt (local services not excluded):
-as above-
d. client's sqlnet.ora: contains ONLY:
-as above-
e. client's listener.ora excerpt:
-as above-
f. remote server's tnsnames.ora excerpt:
# default sid 'orcl' : for local access
orcl =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.qonnectis.com)
# QQ3_Vlan : default sid 'orcl' : access over 10. private net from qq1
QQ3_VLAN =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.99.99.99)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.qonnectis.com)
# nn_qq3 : default sid 'orcl' : access from external sites by public
# external IP - specifically sun admin dba tool in twx
NN_QQ3 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 2.3.44.55)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl.qonnectis.com)
g. remote server's sqlnet.ora contains only:
NAMES.DIRECTORY_PATH= (TNSNAMES)
NAMES.DEFAULT_DOMAIN = qonnectis.com
h. remote server's listener.ora excerpt:
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u01/app/oracle/OraHome_1)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = orcl)
(ORACLE_HOME = /u01/app/oracle/OraHome_1)
(SID_NAME = orcl)
i. on Solaris client, tnsping nn_qq3 : succeeds
j. on Solaris client, sqlplus user/pass@nn_qq3: succeeds
k. on server, Oracle server processes have names like ora_d000_orcl .
l. on server, Oracle connected listener processes show up in ps
listing like oracleorcl (LOCAL=NO)
m. On server, lsnrctl status reports amongst other things
Service "orcl" has 1 instance(s).
Instance "orcl", status UNKNOWN, has 1 handler(s) for this
service...
Service "orcl.qonnectis.com" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
As you can see, I have tried adding an alias for the default domain
name suffix '.qonnectis.com' in the tnsnames.ora files on the solaris
client and on the new 10g server.
Just to add to the fun, the 'new' server running Ora 10g CANNOT connect
to the old server running Ora 9:
sqlplus user/pass@nn_qq3
sqlplus user/pass@nn_qq3.qonnectis.com both fail.
While the old 9.0 server CAN connect to the new 10g one:
sqlplus user/[email protected] succeeds.
Sorry this is such a mess. TBH I find this whole area extremely
confusing.
All suggestions welcome. Unfortunately I am away on holiday next week
but will follow up any leads when I get back.
thanks!
Victor Churchill.

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Cannot sqlplus sys as sysdba from remote server :ORA-12154

Hi,
I am trying to connect from linux VM app server to the database as sys as sysdba but it returns TNS error. I verified that listener is up, the REMOTE_LOGIN_PASSWORDFILE is exclusive and there is password file.
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SQL*Plus: Release 11.2.0.1.0 Production on Fri Apr 12 21:45:08 2013
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
==============================================
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SQL*Plus: Release 11.2.0.1.0 Production on Fri Apr 12 21:49:50 2013
Copyright (c) 1982, 2009, Oracle. All rights reserved.
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SQL>
==================================================
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Edited by: Cherrish on Apr 12, 2013 10:53 PM

Cherrish wrote:
Hi,
I am trying to connect from linux VM app server to the database as sys as sysdba but it returns TNS error. I verified that listener is up, the REMOTE_LOGIN_PASSWORDFILE is exclusive and there is password file.
[ORACLE@SERVER admin]$ sqlplus sys as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Fri Apr 12 21:45:08 2013
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specifiedRealize that sqlplus line above shows no @TNS_ALIAS so no SQL*Net should be used to connect.
please type EXACTLY (line for line) as shown below
env | sort
sqlplus
/ as sysdba
COPY the results from above then PASTE all back here

The server could not be found on the network ORA-12154

Hi All,
I have problem with one application. She run with Oracle DB. I installed Win2008R2 x64 and Oracle DB 32bit on the same server. I tried connect to DB via Oracle SQL Developer and SQL Plus and both run without problem, but when I insert the same parameters into application OpenText Content Server 10, then I see this Error:
Content Server Error:
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Thank you
Vaclav

893964 wrote:
Hi All,
I have problem with one application. She run with Oracle DB. I installed Win2008R2 x64 and Oracle DB 32bit on the same server. I tried connect to DB via Oracle SQL Developer and SQL Plus and both run without problem, but when I insert the same parameters into application OpenText Content Server 10, then I see this Error:
Content Server Error:
[Error: The server could not be found on the network. ----> Error stack ----> 1) E675414020:The server could not be found on the network.:ORA-12154: TNS:could not resolve the connect identifier specified ]
This application need only 3 parameters (System User Name, password and service name). I compare it with ORA files (listener, sqlnet and tnsnames) and I think that all is right. Here are this three files
listener:
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = WIN-R0OEE0OAE5Z)(PORT = 1521))
sqlnet:
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES)
tnsnames
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = WIN-R0OEE0OAE5Z)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
Do you have any idea where is problem?
Thank you
VaclavYou listener has nothing to do with this error. Your request for a connection never left the client machine.
http://edstevensdba.wordpress.com/2011/02/26/ora-12154tns-03505/

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Hi,
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The implementation architecture:
Hyperion 11.1.2.2 (with all the requiered patches for HFM, FDM, Shared Services, Workspace and Oracle Application Development)
Server 1:
Windows Server 2008 x64
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Server 3:
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------------STARTING VALIDATION SCRIPTS----------
LOGGING IN HFM....
CREATING APPLICATION....
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Number (dec) : -2147215936
Number (hex) : &H800415C0
Description : <?xml version="1.0"?>
+<EStr><Ref>{DC34A1FD-EE02-4BA6-86C6-6AEB8EF5E5A3}</Ref><AppName/><User/><DBUpdate>1</DBUpdate><ESec><Num>-2147467259</Num><Type>1</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>HfmADOConnection.cpp</File><Line>511</Line><Ver>11.1.2.2.300.3774</Ver><DStr>ORA-12154: TNS:could not resolve the connect identifier specified</DStr></ESec><ESec><Num>-2147215616</Num><Type>1</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>CHsxSQLConnectionPool.cpp</File><Line>585</Line><Ver>11.1.2.2.300.3774</Ver></ESec><ESec><Num>-2147215936</Num><Type>0</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>CHsxServerImpl.cpp</File><Line>8792</Line><Ver>11.1.2.2.300.3774</Ver></ESec><ESec><Num>-2147215936</Num><Type>0</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>CHsxServer.cpp</File><Line>90</Line><Ver>11.1.2.2.300.3774</Ver></ESec><ESec><Num>-2147215936</Num><Type>1</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>CHsxClient.cpp</File><Line>1356</Line><Ver>11.1.2.2.300.3774</Ver><PSec><Param><server_name></Param></PSec></ESec><ESec><Num>-2147215936</Num><Type>1</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>CHsxClient.cpp</File><Line>936</Line><Ver>11.1.2.2.300.3774</Ver></ESec><ESec><Num>-2147215936</Num><Type>0</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>CHsxClient.cpp</File><Line>4096</Line><Ver>11.1.2.2.300.3774</Ver></ESec></EStr>+
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7. HFM Classic application creation: fails with the following error:
Error*11*<user_name+>*10/19/2012 08:30:52*CHsxServer.cpp*Line 90*<?xml version="1.0"?>+
+<EStr><Ref>{DC34A1FD-EE02-4BA6-86C6-6AEB8EF5E5A3}</Ref><AppName/><User/><DBUpdate>1</DBUpdate><ESec><Num>-2147467259</Num><Type>1</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>HfmADOConnection.cpp</File><Line>511</Line><Ver>11.1.2.2.300.3774</Ver><DStr>ORA-12154: TNS:could not resolve the connect identifier specified</DStr></ESec><ESec><Num>-2147215616</Num><Type>1</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>CHsxSQLConnectionPool.cpp</File><Line>585</Line><Ver>11.1.2.2.300.3774</Ver></ESec><ESec><Num>-2147215936</Num><Type>0</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>CHsxServerImpl.cpp</File><Line>8792</Line><Ver>11.1.2.2.300.3774</Ver></ESec><ESec><Num>-2147215936</Num><Type>0</Type><DTime>10/19/2012 8:30:52 AM</DTime><Svr><server_name></Svr><File>CHsxServer.cpp</File><Line>90</Line><Ver>11.1.2.2.300.3774</Ver></ESec></EStr>+
8. EPMA Application deployment: fails with same message.
Please help me with some insights on this problem, I have tried everything but nothing works.
Regards
Edited by: Otein on 19-oct-2012 14:04

Hi,
I Have solved one of my problems, the one that keep HFM from connecting to the Oracle database.
I just change the TNSNAMES.ORA, like this:
Initial tnsnames.ora
PRUEBA.WORLD=
+(DESCRIPTION_LIST =+
+(DESCRIPTION =+
+(LOAD_BALANACE = ON)+
+(FAILOVER = ON)+
+(ADDRESS_LIST =+
+(ADDRESS = (PROTOCOL = TCP)(HOST = <server_name>)(PORT = <port>))+
+)+
+(CONNECT_DATA =+
+(SERVICE_NAME = <service_name>)+
+)+
+)+
+)+
Modified tnsnames.ora
PRUEBA.WORLD=
+(DESCRIPTION =+
+(LOAD_BALANACE = ON)+
+(FAILOVER = ON)+
+(ADDRESS_LIST =+
+(ADDRESS = (PROTOCOL = TCP)(HOST = <server_name>)(PORT = <port>))+
+)+
+(CONNECT_DATA =+
+(SERVICE_NAME = <service_name>)+
+)+
+)+
I Just delete the line "+(DESCRIPTION_LIST =+" and its corresponding closing parenthesis, I did this cause in the configuration utility log I saw this line:
+TNS parsing: Entry: DESCRIPTION_LIST [[Address: Protocol:(TCP) Host:(<server_name>) Port:(1521) SID:(<service_name>)]]+
So, if the applications were trying to connect to connection descriptor DESCRIPTION_LIST, the driver could not recognize DESCRIPTION_LIST as a valid one.
There is a lot going on behind the scenes when you work with Oracle Database as the repository, maybe there is some other way to address this issue, but it worked for me, hope it can help you too.

Hi...Please help...Getting ORA 12154 TNS Listener could not resolve...

Hi,
I have just loaded Oracle 10g Rel 2 in Win 2003 Enterprise Edition.
But when I try to connect to sqlplus, I am getting ORA -12154 : TNS: Listener could not resolve the connect identified specified.
I have registered the database, the listener and tnsnames have been set correctly.
I have also set the Oracle Home environment variable.
Still getting the error.
Any help will be highly appreciated.
Thanks,

I agree
ORA-12145: (does not exist in the standard manuals)
ORA-12154: TNS:could not resolve the connect identifier specified
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
ORA-12541: TNS:no listener
It is pretty easy to fat-finger these 4 message numbers. As a result, when a person has the actual and complete error message and an error number for a different message, it is usually not a bad idea to use the actual message. (Based on transposing only 3 digits compared to typing over 50 characters correctly.)
In this case the OP has really bollixed things: Subject implies a true 12154, text in the thread is an actual 12514 but mentions 12154.
As a result, there are several potentially correct answers, depending on the interpretation of the question.
- sb92075 gave the correct answer based on the number
- I gave the correct answer based on the message in the thread
- Anurag and Ed gave the correct answer based on 'the question is not formed correctly'
Edited by: Hans Forbrich on Jan 24, 2010 7:13 AM
(BTW - ORA-12415 and ORA-12451 are the other permutations ... described http://download.oracle.com/docs/cd/B19306_01/server.102/b14219/e12400.htm#sthref3357)

Error in vmware server 1.0.4 & solaris 10

After I add a scsi disk, then network can not work. Why ?
Error is:
Failed to plumb IPv4 interface(s): pcn0
Failed to configure IPv4 DHCP interface(s): pcn0
this is the VMX:
config.version = "8"
virtualHW.version = "4"
scsi0.present = "TRUE"
scsi0.virtualDev = "lsilogic"
memsize = "1024"
MemAllowAutoScaleDown = "FALSE"
ide0:0.present = "TRUE"
ide0:0.fileName = "Solaris 10 (experimental).vmdk"
ide1:0.present = "TRUE"
ide1:0.fileName = "G:\Software\Sun\Solaris 10 for X86\sol-10-u4-ga-x86-dvd.iso"
ide1:0.deviceType = "cdrom-image"
floppy0.fileName = "A:"
ethernet0.present = "TRUE"
ethernet0.virtualDev = "e1000"
sound.present = "TRUE"
sound.virtualDev = "es1371"
sound.fileName = "-1"
sound.autodetect = "TRUE"
displayName = "Solaris 10 (experimental)"
guestOS = "solaris10"
nvram = "Solaris 10 (experimental).nvram"
ide1:0.autodetect = "TRUE"
floppy0.startConnected = "FALSE"
sound.startConnected = "FALSE"
ide0:0.redo = ""
ethernet0.addressType = "generated"
uuid.location = "56 4d 1e dd 23 f8 b6 7f-90 e9 b2 f6 f3 d3 26 d8"
uuid.bios = "56 4d 1e dd 23 f8 b6 7f-90 e9 b2 f6 f3 d3 26 d8"
tools.remindInstall = "TRUE"
ethernet0.generatedAddress = "00:0c:29:d3:26:d8"
ethernet0.generatedAddressOffset = "0"
scsi1.present = "TRUE"
scsi1:0.present = "TRUE"
scsi1:0.fileName = "D:\Virtual Machines\Solaris\share\datadisk1.vmdk"
scsi1:0.mode = "independent-persistent"
scsi1.virtualDev = "lsilogic"
priority.grabbed = "normal"
priority.ungrabbed = "normal"
scsi1:0.redo = ""

I have faced a similar problem, but I was testing a lot of things simultaneously (not very smart obviously), of which was adding SCSI and IDE disks.
Anyway:
I am running VMware server 1.0.4 on Windows XP.
I have a Solaris 10 8/07 virtual machine installed.
The VM is NATing through the host os's network.
I have two network adapters (physically on my laptop), one wireless and one wired, I can have any combination of them being enabled or disabled according to where I am working, and sometimes I start the virtual machine with neither of them enabled.
When I installed the Solaris VM, the network interface was configured as pcn0. At some point (don't know exactly what i was testing then) pcn0 was no longer available and pcn1 suddenly appeared. Later on this happened again and pnc1 disappeared and I got pcn2.
As far as I can tell this happens when I start the VM with a different combination of NIC's enabled / disable , i.e. for some reason, having a different physical interface enabled causes Solaris in the VM to configure a different instance of the pcn interface.
I am not sure yet if this is really what is going on, but for now I am focusing on testing what is running on the vm rather than giving in to my technical cravings to get to the roots of this problem, so for a quick fix, just grep for pcn in /etc/path_to_inst, and try plumbing the instances you find there. The one that does not return an error is the one that is currently working.
Just change your hostname.pcnx or pcnx.dhcp file to reflect the correct instance number and do an "svcadm clear physical" this will get your network started and start all the dependent services.
Hope this helps.

ORA-12154: Error when connecting to asm instance

hi all, I am now facing new problem with asm of clusterware, I failed to connect to asm instance, there is how I did it:
sqlplus /nologSQL*Plus: Release 11.2.0.1.0 Production on Wed Jul 7 04:58:52 2010
Copyright (c) 1982, 2010, Oracle. All rights reserved.
SQL> connect sys@+ASM as sysasm
Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
I consider listener is correct configed.
lsnrctl statusLSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 07-JUL-2010 08:51:49
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 64-bit Windows: Version 11.2.0.1.0 - Produ
ction
Start Date 05-JUL-2010 22:12:29
Uptime 1 days 6 hr. 39 min. 23 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File E:\app\11.2.0\grid\network\admin\listener.ora
Listener Log File e:\app\11.2.0\grid\log\diag\tnslsnr\rac1\listener\aler
t\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\LISTENERipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.0.110)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.0.112)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+asm2", status READY, has 1 handler(s) for this service...
Service "itpub" has 1 instance(s).
Instance "itpub2", status READY, has 1 handler(s) for this service...
Service "itpubXDB" has 1 instance(s).
Instance "itpub2", status READY, has 1 handler(s) for this service...
The command completed successfully
How to resolve the promblem? Best regards..

thank you for you kind.. I forgot it... but after I modify tnsname.ora, Error number changed..
tnsname.ora:
# tnsnames.ora Network Configuration File: E:\oracle\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
ITPUB =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = rac-cluster-scan)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = itpub)
+ASM =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = rac-cluster-scan)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = +ASM)
*>sqlplus /nolog*
SQL*Plus: Release 11.2.0.1.0 Production on Wed Jul 7 12:50:07 2010
Copyright (c) 1982, 2010, Oracle. All rights reserved.
SQL> connect sys@+asm as sysasm
Enter password:
ERROR:
ORA-12514: TNS:listener does not currently know of service requested in connect
descriptor
SQL>
tnsping +asmTNS Ping Utility for 64-bit Windows: Version 11.2.0.1.0 - Production on 07-JUL-2
010 12:51:09
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
E:\oracle\product\11.2.0\dbhome_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = rac-clus
ter-scan)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = +as
m)))
OK (20 msec)

ORA-12154 could not resolve the connect indentifier specified

[http://www.freeimagehosting.net/image.php?793d240bb3.jpg]
when i try to install oracle 10g i find this problem i wish you help me

user473080 wrote:
[http://www.freeimagehosting.net/image.php?793d240bb3.jpg]
when i try to install oracle 10g i find this problem i wish you help meIn the future please work from a command line and use copy and paste to put commands and results in your posts. Many people's corporate nets block access to blog sites.
I have recently blogged extensively on this very subject. See edstevensdba.wordpress.com. I can't post a link to the exact article, because my corporate website blocks access to blog sites. I have also, many many times posted on this error in this forum, which a cursory search would have turned up. But once again, back by popular request:
=================================
ORA-12154: TNS:could not resolve the connect identifier specified
This error means one thing, and one thing only. The client could not find the specified entry in the tnsnames.ora file being used.
As a follow-on to that statement, remember that when you use a dblink, the database in which the link is defined is acting as a client to the database that is the target of the link. So in this case, the tnsnames.ora file on the host of your source should have an entry for your target db, as defined in the db_link.
And for the umpteenth time ... this error has NOTHING to do with the status of a listener. The connection request never got far enough to reach a listener. If anyone tells you to check a listener in response to ora-12154, they are not paying attention, or do not understand how TNS works. This error is the equivalent of not being able to place a telephone call because you don't know the number of the party you want to reach. You wouldn't debug that situation by going to the other guy's house and testing his telephone, or by going to the phone company and testing the switchboard. And you don't debug a ORA-12154 by checking the listener. If I had a top ten list of "Incredibly Simple Concepts (tm)" that should be burned into the brain of everyone who claims to be an Oracle DBA, it would include "ORA-12154 Has Nothing To Do With The Listener".
=================================
A couple of important points.
First, the listener is a server side only process. It's entire purpose in life is to receive requests for connections to databases and set up those connections. Once the connection is established, the listener is out of the picture. It creates the connection. It doesn't sustain the connection. One listener, with the default name of LISTENER, running from one oracle home, listening on a single port, will serve multiple database instances of multiple versions running from multiple homes. It is an unnecessary complexity to try to have multiple listeners or to name the listener as if it belongs to a particular database. That would be like the telephone company building a separate switchboard for each customer.
Additional notes on the listener: One listener is capable of listening on multiple ports. But please notice that it is the listener using these ports, not the database instance. You can't bind a specific listener port to a specific db instance. Similarly, one listener is capable of listnening on multiple IP addresses (in the case of a server with multiple NICs) But just like the port, you can't bind a specific ip address to a specific db instance.
Second, the tnsnames.ora file is a client side issue. It's purpose is for address resolution - the tns equivalent of the 'hosts' file further down the network stack. The only reason it exists on a host machine is because that machine can also run client processes.
Assume you have the following in your tnsnames.ora:
larry =
(DESCRIPTION =
 (ADDRESS_LIST =
 (ADDRESS = (PROTOCOL = TCP)(HOST = myhost)(PORT = 1521))
 (CONNECT_DATA =
 (SERVICE_NAME = curley)
)Now, when you issue a connect, say like this:
$> sqlplus scott/tiger@larrytns will look in your tnsnames.ora for an entry called 'larry'. Finding it, tns sends a request through the normal network stack to (PORT = 1521) on (HOST = myhost) using (PROTOCOL = TCP), asking for a connection to (SERVICE_NAME = curley).
Where is (HOST = myhost) on the network? When the request gets passed from tns to the next layer in the network stack, the name 'myhost' will get resolved to an IP address, either via a local 'hosts' file, via DNS, or possibly other less used mechanisms. You can also hard-code the ip address (HOST = 123.456.789.101) in the tnsnames.ora.
Next, the standard networking process delivers the message to port 1521 on myhost. Hopefully, there is a listener on myhost configured to listen on port 1521, and that listener knows about SERVICE_NAME = curley. If so, the listener will spawn a server process to act as the intermediary between your client and the database instance. Communication to the server process will be on a randomly selected available port. At that point the listener is out of the process and continues to user port 1521 to await other connection requests.
What can go wrong?
First, there may not be an entry for 'larry' in your tnsnames. In that case you get "ORA-12154: TNS:could not resolve the connect identifier specified" No need to go looking for a problem on the host, with the listener, etc. If you can't place a telephone call because you don't know the number (can't find your telephone directory (tnsnames.ora) or can't find the party you are looking for listed in it (no entry for larry)) you don't look for problems at the telephone switchboard.
Maybe the entry for larry was found, but myhost couldn't be resolved to an IP address (say there was no entry for myhost in the local hosts file). This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe there was an entry for myserver in the local hosts file, but it specified a bad IP address. This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe the IP was good, but there is no listener running: "ORA-12541: TNS:no listener"
Maybe the IP was good, there is a listener at myhost, but it is listening on a different port. "ORA-12560: TNS:protocol adapter error"
Maybe the IP was good, there is a listener at myhost, it is listening on the specified port, but doesn't know about SERVICE_NAME = curley. "ORA-12514: TNS:listener does not currently know of service requested in connect descriptor"
Third: If the client is on the same machine as the db instance, it is possible to connect without referencing tnsnames and without going through the listener.
Now, when you issue a connect, say like this:
$> sqlplus scott/tigertns will attempt to establish an IPC connection to the db instance. How does it know the name of the instance? It uses the current value of the enviornment variable ORACLE_SID. So...
$> export ORACLE_SID=fred
$> sqlplus scott/tigerIt will attempt to connect to the instance known as "fred". If there is no such instance, it will, of course, fail. Also, if there is no value set for ORACLE_SID, the connect will fail.
check executing instances to get the SID
[oracle@vmlnx01 ~]$ ps -ef|grep pmon|grep -v grep
oracle 4236 1 0 10:30 ? 00:00:00 ora_pmon_vlnxora1set ORACLE_SID appropriately, and connect
[oracle@vmlnx01 ~]$ export ORACLE_SID='vlnxora1
[oracle@vmlnx01 ~]$ sqlplus scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:42:37 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsNow set ORACLE_SID to a bogus value, and try to connect
SQL> exit
[oracle@vmlnx01 ~]$ export ORACLE_SID=FUBAR
[oracle@vmlnx01 ~]$ sqlplus scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:42:57 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory
Enter user-name: Now set ORACLE_SID to null, and try to connect
[oracle@vmlnx01 ~]$ export ORACLE_SID=
[oracle@vmlnx01 ~]$ sqlplus /scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:43:24 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
ERROR:
ORA-12162: TNS:net service name is incorrectly specifiedOk, that is how we get from the client connection request to the listener. What about the listener's part of all this?
The listener is very simple. It's job is to listen for connection requests and make the connection (server process) between the client and the database instance. Once that connection is made, the listener is out of the picture. If you were to kill the listener, all existing connections would continue. The listener is configured with the listener.ora file, but if that file doesn't exist, the listener is quite capable of starting up with all default values. One common mistake with the listner configuration is to specify "HOST=localhost" or "HOST=127.0.01". This is a NONROUTABLE ip address. LOCALHOST and ip address 127.0.0.1 always mean "this machine on which I am sitting". So, all computers are known as "localhost" or "127.0.0.1". If you specify this address, the listener will only be capable of receiving requests from the machine on which it is running. If you specified that address in your tnsnames file - on a remote client machine - the request would be routed to the machine on which the requesting client resides. Probably not what you want.
=====================================

Oracle 10g installation ora 12154 i really need help anyone

history: reinstallation, can't pass ora 12154; system windows xp sp2 problem ora 12154
Destination Folder: L:\oraclexe\
Port for 'Oracle Database Listener': 1521
Port for 'Oracle Services for Microsoft Transaction Server': 2030
Port for HTTP Listener: 8081
My friend, I believe you created a mess by Installing Oracle 10g Enterprise with your DHCP enable in Windows.
There are only 2 options if you want to install Oracle 10g Enterprise on Windows.
1. You install it using Static IP or not connected to network
2. You install Microsoft Loopback, it is a virtual Network driver and this should be assigned as your primary Network driver instead of your current Network.
So if you don't want any headache, the easiest way is uninstall your Oracle 10g, disable the DHCP and use static instead, then install again. that will work for sure.
Don't try to play with the listener and everything because you will get into deeper and deeper problem that end up into frustration :(
cheers
Edited by: Chubbyd4d on May 19, 2009 12:58 PM
Destination Folder: L:\oraclexe\
Port for 'Oracle Database Listener': 1521
Port for 'Oracle Services for Microsoft Transaction Server': 2030
Port for HTTP Listener: 8081
My friend, I believe you created a mess by Installing Oracle 10g Enterprise with your DHCP enable in Windows.
There are only 2 options if you want to install Oracle 10g Enterprise on Windows.
1. You install it using Static IP or not connected to network
2. You install Microsoft Loopback, it is a virtual Network driver and this should be assigned as your primary Network driver instead of your current Network.
So if you don't want any headache, the easiest way is uninstall your Oracle 10g, disable the DHCP and use static instead, then install again. that will work for sure.
Don't try to play with the listener and everything because you will get into deeper and deeper problem that end up into frustration :(
cheers
Edited by: Chubbyd4d on May 19, 2009 12:58 PM
clean start
================================================================================================================
Output generated from configuration assistant "Oracle Net Configuration Assistant":
Parsing command line arguments:
Parameter "orahome" = N:\oracle10g
Parameter "orahnam" = OraDb10g_home1
Parameter "instype" = typical
Parameter "inscomp" = client,oraclenet,javavm,server,ano
Parameter "insprtcl" = tcp,nmp
Parameter "cfg" = local
Parameter "authadp" = NO_VALUE
Parameter "nodeinfo" = NO_VALUE
Parameter "responsefile" = N:\oracle10g\network\install\netca_typ.rsp
Done parsing command line arguments.
Oracle Net Services Configuration:
Profile configuration complete.
The information provided for this listener is currently in use by other software on this computer.
Listener start failed. Listener may already be running.
Listener configuration complete.
Default local naming configuration complete.
Oracle Net Services configuration successful. The exit code is 0
Configuration assistant "Oracle Net Configuration Assistant" succeeded
================================================================================================================
Output generated from configuration assistant "iSQL*Plus Configuration Assistant":
iSQL*Plus 10.1.0.2.0
Copyright (c) 2004 Oracle. All rights reserved.
Starting iSQL*Plus ...
iSQL*Plus started.
Configuration assistant "iSQL*Plus Configuration Assistant" succeeded
================================================================================================================
Output generated from configuration assistant "Oracle Database Configuration Assistant":
Configuration assistant "Oracle Database Configuration Assistant" failed
================================================================================================================
Output generated from configuration assistant "Oracle Database Configuration Assistant" (attempt 2):
Configuration assistant "Oracle Database Configuration Assistant" failed
================================================================================================================
Output generated from configuration assistant "Oracle Database Configuration Assistant" (attempt 3):
Configuration assistant "Oracle Database Configuration Assistant" failed
install microsoft loop back adapter okay
ip 10.10.1.1
255.255.255.0
still ora 12154
disable dhcp client on services.msc
still ora 12154
pls help
this is a fresh install
do i need to remove my oracle 10xe which is perfect working installed on a different drive
pls help me
Edited by: oraclehelper on May 20, 2009 1:45 AM

Destination Folder: L:\oraclexe\
Port for 'Oracle Database Listener': 1521
Port for 'Oracle Services for Microsoft Transaction Server': 2030
Port for HTTP Listener: 8081
My friend, I believe you created a mess by Installing Oracle 10g Enterprise with your DHCP enable in Windows.
There are only 2 options if you want to install Oracle 10g Enterprise on Windows.
1. You install it using Static IP or not connected to network
2. You install Microsoft Loopback, it is a virtual Network driver and this should be assigned as your primary Network driver instead of your current Network.
So if you don't want any headache, the easiest way is uninstall your Oracle 10g, disable the DHCP and use static instead, then install again. that will work for sure.
Don't try to play with the listener and everything because you will get into deeper and deeper problem that end up into frustration :(
cheers
Edited by: Chubbyd4d on May 19, 2009 12:58 PM
Destination Folder: L:\oraclexe\
Port for 'Oracle Database Listener': 1521
Port for 'Oracle Services for Microsoft Transaction Server': 2030
Port for HTTP Listener: 8081
My friend, I believe you created a mess by Installing Oracle 10g Enterprise with your DHCP enable in Windows.
There are only 2 options if you want to install Oracle 10g Enterprise on Windows.
1. You install it using Static IP or not connected to network
2. You install Microsoft Loopback, it is a virtual Network driver and this should be assigned as your primary Network driver instead of your current Network.
So if you don't want any headache, the easiest way is uninstall your Oracle 10g, disable the DHCP and use static instead, then install again. that will work for sure.
Don't try to play with the listener and everything because you will get into deeper and deeper problem that end up into frustration :(
cheers
Edited by: Chubbyd4d on May 19, 2009 12:58 PM
clean start
================================================================================================================
Output generated from configuration assistant "Oracle Net Configuration Assistant":
Parsing command line arguments:
Parameter "orahome" = N:\oracle10g
Parameter "orahnam" = OraDb10g_home1
Parameter "instype" = typical
Parameter "inscomp" = client,oraclenet,javavm,server,ano
Parameter "insprtcl" = tcp,nmp
Parameter "cfg" = local
Parameter "authadp" = NO_VALUE
Parameter "nodeinfo" = NO_VALUE
Parameter "responsefile" = N:\oracle10g\network\install\netca_typ.rsp
Done parsing command line arguments.
Oracle Net Services Configuration:
Profile configuration complete.
The information provided for this listener is currently in use by other software on this computer.
Listener start failed. Listener may already be running.
Listener configuration complete.
Default local naming configuration complete.
Oracle Net Services configuration successful. The exit code is 0
Configuration assistant "Oracle Net Configuration Assistant" succeeded
================================================================================================================
Output generated from configuration assistant "iSQL*Plus Configuration Assistant":
iSQL*Plus 10.1.0.2.0
Copyright (c) 2004 Oracle. All rights reserved.
Starting iSQL*Plus ...
iSQL*Plus started.
Configuration assistant "iSQL*Plus Configuration Assistant" succeeded
================================================================================================================
Output generated from configuration assistant "Oracle Database Configuration Assistant":
Configuration assistant "Oracle Database Configuration Assistant" failed
================================================================================================================
Output generated from configuration assistant "Oracle Database Configuration Assistant" (attempt 2):
Configuration assistant "Oracle Database Configuration Assistant" failed
================================================================================================================
Output generated from configuration assistant "Oracle Database Configuration Assistant" (attempt 3):
Configuration assistant "Oracle Database Configuration Assistant" failed
install microsoft loop back adapter okay
ip 10.10.1.1
255.255.255.0
still ora 12154
disable dhcp client on services.msc
still ora 12154
pls help
this is a fresh install
do i need to remove my oracle 10xe which is perfect working installed on a different drive
pls help me

ODBC-datasource generating ORA-12154 (possible listener issue)

Hi,
I am trying to configure ao ODBC-datasoure from a client (using instant client 11.2) to a 11.2g Oracle DB server. The database listener is configured to use a non standard port 1700 in this case.
There is a firewall between the client and the server which is configured to allow connections to the database server on the specified port, when I use telnet from the client to the server, the connection opens on this port, but when I try to test the odbc-datasource I have configured ig et the error ORA-12154.
The link below outlines the details of the error:
http://ora-12154.ora-code.com/
To the context should be added, that there is no problem to use SQL Plus from a computer behind the firewall to connect to the database server using the TNS name that is being used in the ODBC-datasource.
I have tried to configure the odbc-datasource using both a tns_names.ora file, and also directly in the odbc-datasource using //[ip address] : [port]/TNS_NAME. Both ways of configuring the odbc-datasource generates the same error. I am currently suspecting that the error might be due to some sort of connection redirection on the part of the tns listener on the database server which triggers the firewall to terminate the connection. Could this be the case?
Does anyone have any suggestions what this error might be caused by. Any suggestions on how to continue my troubleshooting would also be valueble. Further, what kind of configuration would need to be inplace, on the tns-listener / database server side to make this sort of configuration to work.
Finally, I should also ask that I have tested the same ODBC-datasource configuration in a test system without any firewall inbetween, and that configuration works fine, so there seems to be no problem with the client software configuration per se.
Any help is apprichated.
/Eaglecoth

Cabelcow wrote:
I managed to solve this issue myself.
Since there seems to be some problem locating the server I added "HOSTNAME" to the following line in the SQLNET.ORA file on the server:
names.directory_path = (HOSTNAME,TNSNAMES)
This solved the issue by using the following syntax in the ODBC Configuration:
TNS Service Name: [ip-address]:[port]/[TNS NAME]
Where the TNS_NAME should be that of the TNS_NAME for the database defined in the TNSNAMES_ORA at the server. Note that this value is case sensetivetnsnames.ora is ONLY used by the client side application. It is the tns complement to the local 'hosts' file. It is used by the CLIENT to resolve an alias (tns net service name) to a host (ultimately an ip), port, and service name. Your assertion that the tns_name should be ... hmm, now that I read that again, are you saying that the tnsnames entry on the client should match the one in the tnsnames file on the server? If so, yes and no. There is no technical requirement that they match. It is simply that it is usually assumed that the one on the server is correct and may be used as a model for what to do on the client. The server - acting as a server - doesn't even use the tnsnames.ora file. It exists on the server only to support any client process that may happen to be running on the same box as the db.
Maybe this will help you understand the connections
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ORA-12154: TNS:could not resolve the connect identifier specified
This error means one thing, and one thing only. The client could not find the specified entry in the tnsnames.ora file being used.
As a follow-on to that statement, remember that when you use a dblink, the database in which the link is defined is acting as a client to the database that is the target of the link. So in this case, the tnsnames.ora file on the host of your source should have an entry for your target db, as defined in the db_link.
And for the umpteenth time ... this error has NOTHING to do with the status of a listener. The connection request never got far enough to reach a listener. If anyone tells you to check a listener in response to ora-12154, they are not paying attention, or do not understand how TNS works. This error is the equivalent of not being able to place a telephone call because you don't know the number of the party you want to reach. You wouldn't debug that situation by going to the other guy's house and testing his telephone, or by going to the phone company and testing the switchboard. And you don't debug a ORA-12154 by checking the listener. If I had a top ten list of "Incredibly Simple Concepts (tm)" that should be burned into the brain of everyone who claims to be an Oracle DBA, it would include "ORA-12154 Has Nothing To Do With The Listener".
=================================
A couple of important points.
First, the listener is a server side only process. It's entire purpose in life is to receive requests for connections to databases and set up those connections. Once the connection is established, the listener is out of the picture. It creates the connection. It doesn't sustain the connection. One listener, with the default name of LISTENER, running from one oracle home, listening on a single port, will serve multiple database instances of multiple versions running from multiple homes. It is an unnecessary complexity to try to have multiple listeners or to name the listener as if it belongs to a particular database. That would be like the telephone company building a separate switchboard for each customer.
Additional notes on the listener: One listener is capable of listening on multiple ports. But please notice that it is the listener using these ports, not the database instance. You can't bind a specific listener port to a specific db instance. Similarly, one listener is capable of listnening on multiple IP addresses (in the case of a server with multiple NICs) But just like the port, you can't bind a specific ip address to a specific db instance.
Second, the tnsnames.ora file is a client side issue. It's purpose is for address resolution - the tns equivalent of the 'hosts' file further down the network stack. The only reason it exists on a host machine is because that machine can also run client processes.
Assume you have the following in your tnsnames.ora:
larry =
(DESCRIPTION =
 (ADDRESS_LIST =
 (ADDRESS = (PROTOCOL = TCP)(HOST = myhost)(PORT = 1521))
 (CONNECT_DATA =
 (SERVICE_NAME = curley)
)Now, when you issue a connect, say like this:
$> sqlplus scott/tiger@larrytns will look in your tnsnames.ora for an entry called 'larry'. Finding it, tns sends a request through the normal network stack to (PORT = 1521) on (HOST = myhost) using (PROTOCOL = TCP), asking for a connection to (SERVICE_NAME = curley).
Where is (HOST = myhost) on the network? When the request gets passed from tns to the next layer in the network stack, the name 'myhost' will get resolved to an IP address, either via a local 'hosts' file, via DNS, or possibly other less used mechanisms. You can also hard-code the ip address (HOST = 123.456.789.101) in the tnsnames.ora.
Next, the standard networking process delivers the message to port 1521 on myhost. Hopefully, there is a listener on myhost configured to listen on port 1521, and that listener knows about SERVICE_NAME = curley. If so, the listener will spawn a server process to act as the intermediary between your client and the database instance. Communication to the server process will be on a randomly selected available port. At that point the listener is out of the process and continues to user port 1521 to await other connection requests.
What can go wrong?
First, there may not be an entry for 'larry' in your tnsnames. In that case you get "ORA-12154: TNS:could not resolve the connect identifier specified" No need to go looking for a problem on the host, with the listener, etc. If you can't place a telephone call because you don't know the number (can't find your telephone directory (tnsnames.ora) or can't find the party you are looking for listed in it (no entry for larry)) you don't look for problems at the telephone switchboard.
Maybe the entry for larry was found, but myhost couldn't be resolved to an IP address (say there was no entry for myhost in the local hosts file). This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe there was an entry for myserver in the local hosts file, but it specified a bad IP address. This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe the IP was good, but there is no listener running: "ORA-12541: TNS:no listener"
Maybe the IP was good, there is a listener at myhost, but it is listening on a different port. "ORA-12560: TNS:protocol adapter error"
Maybe the IP was good, there is a listener at myhost, it is listening on the specified port, but doesn't know about SERVICE_NAME = curley. "ORA-12514: TNS:listener does not currently know of service requested in connect descriptor"
Third: If the client is on the same machine as the db instance, it is possible to connect without referencing tnsnames and without going through the listener.
Now, when you issue a connect, say like this:
$> sqlplus scott/tigertns will attempt to establish an IPC connection to the db instance. How does it know the name of the instance? It uses the current value of the enviornment variable ORACLE_SID. So...
$> export ORACLE_SID=fred
$> sqlplus scott/tigerIt will attempt to connect to the instance known as "fred". If there is no such instance, it will, of course, fail. Also, if there is no value set for ORACLE_SID, the connect will fail.
check executing instances to get the SID
[oracle@vmlnx01 ~]$ ps -ef|grep pmon|grep -v grep
oracle 4236 1 0 10:30 ? 00:00:00 ora_pmon_vlnxora1set ORACLE_SID appropriately, and connect
[oracle@vmlnx01 ~]$ export ORACLE_SID='vlnxora1
[oracle@vmlnx01 ~]$ sqlplus scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:42:37 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing optionsNow set ORACLE_SID to a bogus value, and try to connect
SQL> exit
[oracle@vmlnx01 ~]$ export ORACLE_SID=FUBAR
[oracle@vmlnx01 ~]$ sqlplus scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:42:57 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
ERROR:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory
Enter user-name: Now set ORACLE_SID to null, and try to connect
[oracle@vmlnx01 ~]$ export ORACLE_SID=
[oracle@vmlnx01 ~]$ sqlplus /scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Wed Sep 22 10:43:24 2010
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
ERROR:
ORA-12162: TNS:net service name is incorrectly specifiedOk, that is how we get from the client connection request to the listener. What about the listener's part of all this?
The listener is very simple. It's job is to listen for connection requests and make the connection (server process) between the client and the database instance. Once that connection is made, the listener is out of the picture. If you were to kill the listener, all existing connections would continue. The listener is configured with the listener.ora file, but if that file doesn't exist, the listener is quite capable of starting up with all default values. One common mistake with the listner configuration is to specify "HOST=localhost" or "HOST=127.0.01". This is a NONROUTABLE ip address. LOCALHOST and ip address 127.0.0.1 always mean "this machine on which I am sitting". So, all computers are known as "localhost" or "127.0.0.1". If you specify this address, the listener will only be capable of receiving requests from the machine on which it is running. If you specified that address in your tnsnames file - on a remote client machine - the request would be routed to the machine on which the requesting client resides. Probably not what you want.
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