Tnsname.ora and listener.ora files in RAC environment.

Want to clear my concept regarding
tnsname.ora and listener.ora files in RAC environment. Is there any good notes on Metalink for that?

Check this metalink note, it covers specific RAC issues:
Configuration of Load Balancing and Transparent Application Failover
Note:226880.1
Werner

Similar Messages

Questions on sqlnet.ora, listener.ora files in RAC environment.

Experts,
I've some confusion with below files in RAC environment.
sqlnet.ora
listener.ora
These files are available in two locations: <GRID_HOME> & <DB_HOME>.
My questions:
1. Why do we have two versions of files ?
2. When I query lsnrctl status from BOTH the homes, it says it is using listener.ora from <GRID_HOME> as shown below.
Listener Parameter File D:\app\11.2.0\grid\network\admin\listener.ora
3. What is the use of files which are in <DB_Home>
4. If you make some changes to listener using "Netmgr" tool, we expect it will update listener.ora in <GRID_HOME>. Interestingly, it is changing the contents of listener.ora in <DB_HOME> .
Can anyone please clarify it ?
Thanks in advance.

859875 wrote:
1. Why do we have two versions of files ? In the past, the CRS s/w did not include ASM (ASM did not provide support for cluster voting and registration disks). Thus the networking components such as SQL*Net and the Listener were not part of the CRS installation.
With Grid Infrastructure, ASM supports cluster voting and registration disks and is recommended to be used for that (as oppose to the old style of raw disks or using an external cluster-based cooked file system like <i>ocfs</i>). And with ASM comes the SQL*Net networking layer and s/w (such as the Listener). As ASM ships with Grid Infrastructure, it now also includes the same networking layer as what the RDBMS installation will. Thus both <GRID_HOME> and <DB_HOME> will contain the same networking components.
However, only a single Listener is for example needed. And that can only run from a single base location. So for operational use, only one version will be actively in use.

1.2.0 reads TNSNAMES.ORA file multiple times and duplicates values in Alias

Since upgrading to 1.2.0.29.98 (clean install on Win XP SP 2), I have noticed that SQL Developer appears to be reading the TNSNAMES.ORA file multiple times. This results in the Network Alias pop-list on the TNS connection type to have duplicate values, although the number of duplicates for each entry varies widely - from four for the least that I saw and 252 for the most (assuming I counted that right :) ). We have approximately 270 entries in our TNSNAMES.ORA and the first entry in the file appears in the Network Alias list four times and the last entry in the file appears in the list 48 times.
To be honest, I switched to Basic JDBC connections with 1.1 and only noticed the problem because of some network performance issues - I thought that SQL Developer had hung and I switched on the debugging and could see that it was looping through the TNSNAMES.ORA file. Now that the network performance issues have been resolved, it still takes a little while to open the new connection window, but it is liveable, so I don't know whether the problem is 1.2 specific or not.

Sue,
I assume from a bit of testing, that "each tns file on the system" means each file in the TNS_ADMIN location that starts with TNSNAMES.ORA.
I set my TNS_ADMIN to a local location and copied the current TNSNAMES.ORA from the network location (and chopped it down to a handful of entries). When I restarted SQL Developer I only had a single copy of each alias. If I copied TNSNAMES.ORA to "Copy of TNSNAMES.ORA" I still only had a single copy of each alias. If I copied TNSNAMES.ORA to TNSNAMES.ORA.TXT I then had two copies of each alias.
Unfortunately, I don't have any say in the maintenance of the network TNS_ADMIN location and it has almost 200 backup copies of the tns file, typically named TNSNAMES.ORA.YYYYMMDD.
My TNS_ADMIN setting is done as a Windows environment variable. I do not have any TNS_ADMIN setting in my registry.

Should dbassist create an entry in my tnsnames.ora file?

I just created an instance on Solaris with dbassist and the sample minimal.rsp response file (8.1.7). I was surprised to note that no entry was created in the tnsnames.ora file as I would expect (it does create an entry on Windows platforms). Is this typical behavior? I did not see any option in the response file to do this. Another thing I notice was that it created an entry in the oratab file with the auto start flag set to n. Is there a way to make dbassist set that flag to y during install or am I going to have to sed it afterwards?
Thanks,
John

1. Do I have to use the external IP address in the LISTENER.ora
file if I want clients external
to the firewall to connect to my database?No, you should simple use the internal address - there's no need
to use the external address. The packets that reach the server
do not contain the external address by the time they get to the
server. The firewall performs NAT on the external address
translating it to the internal address on the way in and
translating the internal address to the external address on the
way out.
2. If I change the entries in the LISTENER.ora file from
<production> to <172.168.0.101>, then
clients cannot connect to the database. Is this a normal
thing? I remember that I could use
internal IP addresses in ORACLE7 and 8 in the LISTENER.ORA
file.There must be something wrong with your DNS. If you run the
command "ping production" what address do you get? The external
address? If you attempt to ping 172.168.0.101 from a client that
can not connect, what do you get? What if you run the
command "tracert production"? What path do the packets take to
the server.
There sounds like there is some network topology issues in that
the clients can't get directly to the internal address but are
instead going through the firewall to get to the database. I
would suggest using a sniffer on the database (with the
appropriate authorization) to see what's going on and get a
network admin involved.
Regards,
Aaron C. Newman
Co-author, Oracle Security Handbook
[email protected]
Application Security, Inc.
www.appsecinc.com
phone: 212-490-6022
-Protection Where It Counts-

Tnsnames.ora file unable to edit in my Laptop

hi,
I have installed Oracle 10g on my personal laptop.
It worked fine on the day I installed.
Now I get tnsconnect timeout occured.
I searched the tnsnames.ora file and could not modify the file.
# tnsnames.ora Network Configuration File: D:\oracle\product\10.2.0\db_1\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
ORCL =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.106)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
)Also I could connect to 192.168.1.106 console through web browser but today I get connection timeout error.
Can you please help me?
Thanks,
Nag.

please replace 192.168.1.106 with 172.0.0.1
in tnsnames.ora nad listener.ora
ORCL =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 172.0.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
# listener.ora Network Configuration File: D:\oracle\product\10.2.0\db_1\network\admin\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.0.0.1)(PORT = 1521))
export ORACLE_SID=orcl
restart listener
lsnrctl stop listener
lsnrctl start listener
tnsping orcl
conn scott/tiger@orcl
or
sqlplus / as sysdba

Can't srvctl command write tnsnames.ora file?

Hi,
I use srvctl to create a new service correctly, but I find the information of this service isn't written into tnsnames.ora file, it means, user can't connect database by directly using this service name, it's very stranger, who can tell me how to use srvctl to create a service and ensuer the information about this service can be correctly written into tnsnames.ora file?
#srvctl add service -d mm -s mx -r node1 -a node2.

Did you check tnsnames.ora for any new entries?
Yes,There are not any new entries for the new service I just created.
Check the command reference again, there is a flag to display "sample tns entries"
http://download.oracle.com/docs/cd/B19306_01/rac.102/b14197/srvctladmin.htm#i1008779
I check that documentation, and I can use that command to run in my RAC environment, the returned result is
Example client-side TNS entry for service mx:
mx = (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=db_vip)(PORT=dedicated_port
))(CONNECT_DATA=(SERVICE_NAME=mx)(FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC
How to use this service in client or our application, must we manullay configure tnsnames.ora file?
BRs./Vinson

Tnsnames.ora file does not seem to load in SQL Developer

I've really tried my best to figure this out on my own ... through the Help, this forum, and Internet in general. I apoligize in advance for having to ask this, since I'm sure this is a common issue. This particular form entry was really close:
Database Connections will not load tnsnames.ora
But, I just can seem to figure out why, or where entries from my tnsnames.ora file are loading into SQL Developer.
- I have the TNS_ADMIN system environment variable defined to the directory where tnsnames.ora is stored - C:\oracle\product\10.2.0\client_1\NETWORK\ADMIN.
- I do not see a TNS tab as the forum entry above indicates anywhere in SQL Developer - This may be my problem.
It seems that this issue could be cleared up with better directions on how to import tnsnames.ora entries into SQL Developer. Is there any specific direction on how to get your tnsnames.ora file setup correctly with SQL Developer running on Windows XP - Besides the Help which mentions the setup of TNS_ADMIN, but doesn't really tell you what the expected result is, or where the entries will be, or how to verify this is working?
Any help would be most appreciated.
Thanks,
Dave
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Using Windows XP/Vista...
After testing in our environment, it appears that SQL Developer 1.5.1 (5440) does in fact ignore the TNS_ADMIN environment variable and ONLY looks in the Oracle Home directory (network/admin). We define a central network location for our tnsnames file and have the tns_admin setup to point there instead of locally for our users.
When selecting to add a new connection (in 1.5.1, it works in previously releases... meaning 1.2.something) and selecting TNS, the drop-down remains empty. However, if I exit SQL Developer and then copy the tnsnames file to the local network/admin directory I can then re-launch SQL Developer and the drop-down is populated. Exiting SQL Developer again, deleting the local copy of tnsnames, and then launching SQL Developer yet again results in the drop-down being empty.
All other Oracle-related applications function as expected (as they have for years) using the TNS_ADMIN environment variable.
Any suggestions/ideas?

How to use ODBC SQLDriverConnect() without using tnsnames.ora file

I have an ODBC application that connects to an Oracle 10g database. Currently, my SQLDriverConnect() function call uses the following connection string:
DRIVER={Oracle in OraClient10g_home1}; DBQ=MyDB.world; DBA=W; UID=foo; PWD=bar
This requires an entry in the tnsnames.ora file that looks like this:
MyDB.world =
(DESCRIPTION = (ADDRESS_LIST =
(ADDRESS =
(PROTOCOL = TCP)(Host = server1.intel.com)(Port = 1521)
(ADDRESS =
(PROTOCOL = TCP)(Host = server2.intel.com)(Port = 1521)
(ADDRESS =
(PROTOCOL = TCP)(Host = server3.intel.com)(Port = 1521)
(ADDRESS =
(PROTOCOL = TCP)(Host = server4.intel.com)(Port = 1521)
(LOAD_BALANCE = yes)
(CONNECT_DATA = (SERVER = DEDICATED)
(SERVICE_NAME = MY_SRVC))
However, I would really like to be able to connect using ODBC without having to create that entry in the tnsnames.ora file. I have tried to substitute the DBQ=MyDB.world with the entire (DESCRIPTION=..... string from the original tnsnames.ora file, but it returns the error:
ORA-12154: TNS: Could not resolve the connect identifier specified.
I have heard others are able to use sqlplus with no tnsnames.ora file and the do specify the entire (DESCRIPTION=.... string on the sqlplus connection string, but is this possible to do using the ODBC SQLDriverConnect() function? If so, do I need to use a different keyword/value pair other than DBQ=?
Any help on this would be greatly appreciated.
Thank you.

How would that work in a load balanced configuration? Take a closer look at the tnsnames.ora example I included in my original post. I have 4 ADDRESS= sections to denote 4 servers that are part of the load balanced environment.
Also, I'm not familiar with that syntax, I need to use the syntax supported by the SQLDriverConnect() API function, which looks like this:
DRIVER={Oracle in OraClient10g_home1}; DBQ=MyDB.world; DBA=W; UID=foo; PWD=bar
I don't know as SQLDriverConnect() would accept an alternative syntax. But the more important issue here is the ability to specify those 4 servers in the load balanced configuration as indicated by that tnsnames.ora entry.

How to deactivate an entry in tnsnames.ora file

Hi all,
I am working with Oracle 10g enterprise edition. I have a data source named with DEVDATA which should not be affected while I am working on my project. Usually, I will add DEVDATA entry in tnsname.ora file if I want to use it and I will remove that entry from tnsnames.ora file in order to protect that data source. It is very laborious process each time when I want to add or remove that entry. Do we have any mean such a way that I can switch between the two options. Currently, I have a desktop shortcut to tnsnames.ora file so that I can add or remove that entry when ever I want. Can we comment out that entry. Please suggest me.
I hope this is the right place to fire this question. If not, direct me. Thanks in advance.
Regards,
Kumar.

[email protected] wrote:
Hi all,
Thanks for your replays. As you said we can comment out lines with '#'. But, I am looking for commenting whole entry at a time. Can any one tell me how to comment out whole entry/paragraph. Is there any oracle utility by which we can deactivate the data source. Please suggest. Thank you.
Regards,
Kumar.As others have said, either comment out each line of the entry, or have two tnsnames files that you rename as needed. But really, how often do you make the swap that commenting/uncommenting about five lines of code is such a burden?

SQL Dev 3.0.04 cannot locate TNSNAMES.ora file after Oracle11g XE Beta

Hello,
I had Oracle Developer Suite (Reports, Forms) installed on Windows 7 32 bit along with SQL Developer 3.0.04 (latest prod. build) and everything was working just fine.
Then, I installed Oracle 11g XE Beta database and now, all the existing Connections in SQL Developer give an error "Invalid connection information specified. Verify the URL format for the specified driver."
I thought since 11gXE was the latest Oracle software installed, the Path environment variable in Windows will have the Oracle 11gXE as the leading path string. So, I cut this leading string : C:\Oracle\Oracle11gXE\product\11.1.0\db_1\bin and appended it at the very end.
This means that the Path that existed prior to the 11gXE install is now the leading and hence SQL Developer should be reading the TNSNAMES.ora file from the very first Oracle Home encountered which is for the developer suite. But this does not seem to work.
Any ideas how to fix this? How does SQL Developer determine which tnsnames file to use?
Thanks,
Manish

Hi Manish,
One place to control this is Tools|Preferences|Database|Advanced|Tnsnames Directory.
Otherwise read the documentation in Help|Table of Contents|SQL Developer Concepts and Usage|Database Connections. The third paragraph contains a description of the various alternatives.
Regards,
Gary Graham
SQL Developer Team
Edited by: gggraham on Jul 18, 2011 2:52 PM

DBA studio: Error add/connect database "Failed to parse tnsnames.ora file"

I have Oracle (version 8.1.7) installed in my XP machine and when I try to (having chosen "Launch DBA Studio standalone") to open a connection I get:
"Failed to parse tnsnames.ora file
ERROR: 100 -- NLNV-NLNV String Format Error".
Also got this when I tried to manually add a database to a tree.
I can access the databases listed in my tnsnames.ora using SQL Plus with no error.
This is my tnsnames.ora.
# TNSNAMES.ORA Network Configuration File: C:\oracle\ora81\network\admin\tnsnames.ora
# Generated by Oracle configuration tools.
INST1_HTTP.xx.yy.GE.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = MyMachine3)(PORT = 1521))
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = buch3ora)
(PRESENTATION = http://admin)
EXTPROC_CONNECTION_DATA.xx.yy.GE.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
MyOra3.xx.yy.GE.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = MyMachine3)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = ora3)
OORCL.xx.yy.GE.COM =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 3.4.55.66)(PORT = 1521))
(CONNECT_DATA = (SERVICE_NAME = oorcl))
Does anybody have any idea what is wrong? Thanks a lot. Changsong

Just found out this IS a string error in my Tnsname.ora. What i did is deleting all the entries in my tnsname.ora, and start adding each one back. I found one particular entry is responsible for the error. This is the old text
serv32.xxx.ge.com =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (COMMUNITY = TCP)(PROTOCOL = TCP)(HOST = sevr32.xxy.ge.com)(PORT = 1521))
(CONNECT_DATA = (SID = atmo32))
just looking by itself I can't see anything wrong. I just formatted it a little, making it looked like the other one that is working
serv32.xxx.ge.com =(DESCRIPTION =
     (ADDRESS_LIST =
     (ADDRESS =
     (COMMUNITY = TCP)
     (PROTOCOL = TCP)
     (HOST = sevr32.xxy.ge.com)
     (PORT = 1521)))
     (CONNECT_DATA=
     (SID = atmo32)))
and now it works fine. I Really can't tell the difference, except that some words were moved to the other line. What puzzled me is that the same old tnsname.ora worked in almost all the other circumstances, like sql plus, and other database enginee. But it is just not good enough for dba studio?
I admit I probably should have used the network utility to add a connection to avoid this type of format error.
Anyhow, I'm glad it is solved. by the way, the symjct.dll mentioned in the previous post should be symcjit.dll. I guess he mispelled the name. I renamed it to symcjit_old.dll and now the java error was gone. So that is another gain from this post. Thanks Joel for all the information.

TNSNAMES.ORA file

Hi,
I was given an oracle remote database connection details like the below:
UMAC100 =
(DESCRIPTION=
(ADDRESS_LIST=
   (ADDRESS=
    (PROTOCOL=TCP)
    (HOST=abcd.efgh.com)
    (PORT=1521)
(CONNECT_DATA=
   (SID=UMAC100)
I use SQL Developer, and figured out the necessary details like connection name, port, hostname, etc from the above deatils and am able to connect.
However when I try to connect to this remote database through sqlplus, it says TNS protocol adapter error.
Through sqlplus, it connects when i give sqlplus db_name/[email protected]':1521/UMAC100'
I was told to copy paste the above
(DESCRIPTION=
(ADDRESS_LIST=...........)) to my tns file.
I tried locating my TNSnames.ora file and found one in D:\app\Unameit\product\11.2.0\client_1\network\admin\sample location. I tried pasting it here, but still, I am unable to connect.
I googled, but am not able to figure out a solution.
Can someone tell me what needs to be done step by step so that I am able to connect through sqlplus typing just the USERNAME/PASSWORD?

Hello
thanks for reply ...
but i think some thing is missing ... there are only few directories under oracle home ...i installed oracle under /opt/app/oracle...
is this correct... ? or
$ cd /opt/app/oracle
$ ls -ltr
total 301312
-rw-r--r-- 1 oracle oinstall 1996228 Jul 31 2009 ojdbc5.jar
-rw-r--r-- 1 oracle oinstall 2111220 Jul 31 2009 ojdbc6.jar
-rw-r--r-- 1 oracle oinstall 82983 Aug 2 2009 orai18n-mapping.jar
-rw-r--r-- 1 oracle oinstall 1656280 Aug 2 2009 orai18n.jar
-rw-r--r-- 1 oracle oinstall 37807 Aug 13 2009 xstreams.jar
-rw-r--r-- 1 oracle oinstall 1296216 Aug 25 2009 libsqlplus.so
-rwxr-xr-x 1 oracle oinstall 8904 Aug 25 2009 sqlplus
-rw-r--r-- 1 oracle oinstall 1503424 Aug 25 2009 libsqlplusic.so
-rw-r--r-- 1 oracle oinstall 7751832 Sep 4 2009 libnnz11.so
-rw-r--r-- 1 oracle oinstall 110576 Sep 28 2009 libocijdbc11.so
-rw-r--r-- 1 oracle oinstall 14072 Sep 28 2009 libheteroxa11.so
-rw-r--r-- 1 oracle oinstall 753808 Nov 2 2009 libsqora.so.11.1
-rw-r--r-- 1 oracle oinstall 45403016 Nov 2 2009 libclntsh.so.11.1
-rw-r--r-- 1 oracle oinstall 1477416 Nov 2 2009 libocci.so.11.1
-rw-r--r-- 1 oracle oinstall 89381056 Nov 2 2009 libociei.so
-rwxr-xr-x 1 oracle oinstall 425712 Nov 2 2009 wrc
-rwxr-xr-x 1 oracle oinstall 25680 Nov 2 2009 adrci
-rw-r----- 1 oracle oinstall 63 May 12 18:23 oraInst.loc
-rw-r--r-- 1 oracle oinstall 38 May 12 18:23 install.platform
drwxr-xr-x 3 oracle oinstall 512 May 12 18:23 odbc
drwxr-xr-x 2 oracle oinstall 512 May 12 18:23 light
drwxrwx--- 13 oracle oinstall 512 May 12 18:23 inventory
drwxrwx--- 5 oracle oinstall 512 May 12 18:23 oraInventory
drwxr-xr-x 3 oracle oinstall 512 May 12 18:23 install
drwxr-xr-x 3 oracle oinstall 512 May 12 18:28 cfgtoollogs
$

SQL developer cannot see connection info from tnsnames.ora file

Greetings All,
I have been using sql developer for a while. Currently on 3.0.04.34.
I have 16 database connections.
Everything was working fine until yesterday.
Today when I tried to connect to a database from the list of connections I am getting following error:
Invalid connection information specified. Verify url format for specified driver.
When I pull up the property for this connection -connection type is still TNS, Netwrok Alias is now greyed out and what was in Netwrok Alias has shifted to Connect Identifier.
When I try to create a new connection I do not see entry from tnsnames.ora file for the databse I am trying to connect to in the Network Alias drop down list.
I can connect to this database from sqlplus.
Has anyone seen this behavior? Does any one know the fix for this?
Thanks.

Hi,
Maybe your preference settings got corrupted, or the Tnsnames.ora file got moved to somewhere SQL Developer can't find it.
Are you using either:
1. Tools|Preferences|Database|Advanced|Tnsnames Directory, or a
2. TNS_ADMIN environment variable
to point to your Tnsnames? Having one of those should enable the Network Alias drop-down list to get populated. Otherwise, if the values moved to Connection Identifier are correct, then you won't be to connect in that mode without also having an Oracle client installed with an 11.1 JDBC thick driver (ocijdbc11.dll).
If there is no issue with the Tnsnames. ora location, it might be a good idea to use Export Connections to make a backup of your connections. Then you can try deleting the connections from SQL Developer and re-importing them. Even if that doesn't fix the problem, you should be no worse off.
Regards,
Gary
SQL Developer Team

SQL Developer is not able to identify the Tnsnames.ora file

Hi,
I have installed the following in the laptop having Win XP:
1) Oracle 10gR2 Client software in the D: drive of laptop. Tnsnames.ora is located in this clients Network\Admin path. This client is used to access the databases on the other servers.
2) Oracle 10gR2 Database software in the E: drive of laptop. Right now there is not Tnsnames.ora file in this softwares Network\Admin path. This db software has been installed to create local databases in the laptop.
3) Oracle SQL Developer Version 2.1.1.64 is also installed in C: drive of laptop.
The problem which now I'm facing is that the SQL Developer is not able to identify the Tnsnames.ora file mentioned in the above point-1 which contains entries of databases on the different servers. Could you please help me out in solving this problem?
Thanks in advance.
MAK

I forget what version I was using at the time, but when I had an ORACLE_HOME defined for the environment and TNSNAMES file defined in SQL Developer (different one than was in ORACLE_HOME), that I would see results from both tns files. I don't know if that is still the case. I have since dropped my ORACLE_HOME environmental variable.

How to recover TNSNAMES.ORA file

Hi, im using Oracle 8i 8.16 database running on win2k server. Im getting a an error whenever i try to connect to the databese using the DBA Studio program - the error was "ORA-12154:TNS:Could Not resolve service name". I noticed that the TNSNAMES.ORA file is blank in the home directory of Oracle8i, anyone knows how to recover the file?.
Thanks
regards
Muraly

Hi Friend,
Thanks alot for ur reply, i tried the solution u gave in ur reply and i manage to get some parameters setting in my tnsnames.ora file - the content of it was
as follows :
# TNSNAMES.ORA Network Configuration File: C:\Oracle\Ora81\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.
COGENT =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = cogent-w2ksvr)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = cogent)
but then i keep getting the same error message.
I notice that the Oracle service (undet the NT services) OracleOraHome81ManagementServer does not get started - when i try to manually start it up - NT return error saying its not startable due to windows error or application error.
The following is my setting from net8 assistant.
Service Naming
---- Service Identification ----
Service name = cogent
SID = ""
connection type = Database Default
Address Config
Protocol = TCP/IP
Hostname = cogent-w2ksvr
Port Number = 1521
My domain name is cogentconsulting.com
My Full computer name is cogent-w2ksvr.cogentconsulting.com
I really appreciate your help in this.
thanks and regards
Muraly
null

Tnsname.ora and listener.ora files in RAC environment.

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