Use of tnsnames.ora

Hi,
Pls help me..
i want to know the use of **tnsnames.ora for oracle developer and also about listener.ora**
pls let me known clearly..
advance thanks....

Welcome to the forums.
This is not a SQL or PL/SQL topic, is it? Please choose forum for your product/topic wisely.
What you ask about is very well documented in the Net Services Reference for your version (of Database).
http://www.oracle.com/pls/db112/portal.portal_db?selected=4&frame=#network_management
Note that reading the documentation - after learning how to find and navigate it - is best not avoided and highly recommended (to say the least), when working with Oracle products.

Similar Messages

Is telnet use local tnsnames.ora?

I was suprise that when the local tnsnames.ora of client was not correct,sqlplus at telnet can't connect to server,and when the file was modify,I can use sqlplus connect to oracle through telnet.
is telnet use local tnsnames.ora?

This is simply impossible.

How to list the datasources without use a tnsnames.ora file?

Hi,
I want to use the OracleDataSourceEnumerator class of ODP.Net to list the datasources on which the user can connect.
It's work with a tnsnames.ora on the local station, so good.
But I want use the easy connect naming methode so i have edited the sqlnet.ora file with this:
NAMES.DIRECTORY_PATH= (EZCONNECT, TNSNAMES)
then i have deleted the content of the tnsnames.ora
so my code don't work : none datasource is returned by the OracleDataSourceEnumerator
So my question : is it a way to list the datasources without use a tnsnames.ora file?
Edited by: user13499556 on 17 déc. 2010 08:21

You can check
DataConnectionFile.EnumerateDependants method
This post is my own opinion and does not necessarily reflect the opinion or view of Slalom.

How to define a DSN without using a tnsnames.ora on the PC client machine

Hi,
Client : Windows XP with Oracle9i ODBC driver
Server : Oracle 10 on Solaris
I need to define a DSN which does not rely on tnsnames.ora on the client machine.
I tried to use a file dsn, but without success, because I don't know the parameters to use.
I used these params in the file.dsn :
[ODBC]
DRIVER=Oracle9i ODBC Driver
UID=testuser
PWD=testpw
SERVER=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=myhost)(PORT=9999))(CONNECT_DATA=(SERVICE_NAME=testSID)))
It does not work ....

Hrm, interesting. It always used to be DBQ but it seems it might have changed to SERVER at some point.
Anyway, I tried this and it worked fine for me (using 10204)
TESTFILE.DSN
================
[ODBC]
DRIVER=Oracle in OraDb10g_home1
server=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=gdarling-pc2)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=orcl)))
TEST.VBS
==========
set con = createobject("adodb.connection")
con.open "filedsn=testfile;uid=scott;pwd=tiger;"
set rs = createobject("adodb.recordset")
rs.open "select user from dual",con
msgbox rs.fields(0).value
Note also that unless you really want to create a file dsn, you could also just use a dsnless connection string and pass that directly too:
set con = createobject("adodb.connection")
con.open "driver={Oracle in OraDb10g_home1};uid=scott;pwd=tiger;server=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=gdarling-pc2)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=orcl)))"
set rs = createobject("adodb.recordset")
rs.open "select user from dual",con
msgbox rs.fields(0).value
Hope it helps,
Greg

Possible to use 2 tnsnames.ora for just one client?

Hi,
in our organisation we have two different tnsnames.ora files. This because of the
fact that there are remote locations each with their own IT department. Each department maitains their own databases, but applications are spread over the whole organisation.
What I would like to to create is a tnsnames.ora in which there is an e.g. include c:\oracle\tnsnames.ora and include c:\oracle1\tnsnames.ore. Would that be possible?
Fred

If what you want to achieve is a situation where different users use the same PC, but you want to limit the tnsnames they have access to, what if you try setting the TNS_ADMIN environment variable to point to the permitted directory for each user env profile.
e.g
user1
TNS_ADMIN=c:\oracle\network\admin\user1
c:\oracle\network\admin\user1\tnsnames.ora
c:\oracle\network\admin\user1\sqlnet.ora
user2
TNS_ADMIN=c:\oracle\network\admin\user2
c:\oracle\network\admin\user2\tnsnames.ora
c:\oracle\network\admin\user2\sqlnet.ora
etc.

Does ODBC SQLDriverConnect allow connections without using tnsnames.ora?

I am trying to find out if the Oracle ODBC driver supports a connection attempt through the SQLDriverConnect() ODBC API function without the need to use the tnsnames.ora file. In other words, I would like to pass into the SQLDriverConnect() function the connection string information that would normally be found in the tnsnames.ora file. The purpose of this would be to force the ODBC driver to bypass reading the tnsnames.ora file entirely and simply use the connection information I pass into the connection buffer in the SQLDriverConnect() function.
If this is possible, can someone explain how to do it? I've tried what I think should have worked, so I'm either not doing this right or this functionallity is not supported by the driver.
Thank you.
-Dave

You might try logging a support request to see if that functionality got restored at some point. My recollection is a year or two old...
The Easy Connect syntax is just another feature of the TNS layer, so it should be available to any apps using the 10g client.
The documentation discusses using the Easy Connect Naming Method in some detail. I've not used it with the Oracle ODBC driver, but it should just work.
Justin

Using tnsnames.ora file instead of oracle names server

hi,
sqlnet.ora file contains
NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES)
NAMES.DEFAULT_DOMAIN = (domain name)
SQLNET.EXPIRE_TIME = 2
DEFAULT_SDU_SIZE = 8761
NAMES.PREFERRED_SERVERS =
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = TCP.world)
(PROTOCOL = TCP)
(Host = oranamesrvr0. domain name)
(Port = 1575)
NAME.PREFERRED_SERVERS =
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = TCP.world)
(PROTOCOL = TCP)
(Host = oranamesrvr0.domain name)
(Port = 1575)
There is also a tnsnames.ora file in the same path as this sqlnet.ora. Can someone tell how can i make the application use the tnsnames.ora file instead of using oracle name servers??
Thanks in advance!!!

917229 wrote:
hi,
sqlnet.ora file contains
NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES)
NAMES.DEFAULT_DOMAIN = (domain name)
SQLNET.EXPIRE_TIME = 2
DEFAULT_SDU_SIZE = 8761
NAMES.PREFERRED_SERVERS =
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = TCP.world)
(PROTOCOL = TCP)
(Host = oranamesrvr0. domain name)
(Port = 1575)
NAME.PREFERRED_SERVERS =
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = TCP.world)
(PROTOCOL = TCP)
(Host = oranamesrvr0.domain name)
(Port = 1575)
There is also a tnsnames.ora file in the same path as this sqlnet.ora. Can someone tell how can i make the application use the tnsnames.ora file instead of using oracle name servers??
Thanks in advance!!!In addition to SB's comment, keep in mind that the client only sees sqlnet.ora and tnsnames.ora that exist on the client machine .. or indicated by TNS_ADMIN as defined on the client machine. Setting this on the db server is meaningless to the client unless the client also resides on the db server.

Tnsnames.ora is not working

Hello,
In my UAT envirnment we have 3 database on IBM AIX powerPC (64-bit) all are on 10.2.0.5.0
My listener.ora and tnsnames.ora is at default location $ORACLE_HOME/network/admin/
my listener is up
$ lsnrctl status
LSNRCTL for IBM/AIX RISC System/6000: Version 10.2.0.5.0 - Production on 04-MAR-2011 11:56:08
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for IBM/AIX RISC System/6000: Version 10.2.0.5.0 - Production
Start Date 16-FEB-2011 18:51:16
Uptime 15 days 17 hr. 4 min. 52 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/oracle/product/10.2.0.1/db_1/network/admin/listener.ora
Listener Log File /u01/app/oracle/product/10.2.0.1/db_1/network/log/listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=172.16.8.17)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "preprod" has 1 instance(s).
Instance "preprod", status UNKNOWN, has 1 handler(s) for this service...
Service "uat" has 2 instance(s).
Instance "uat", status UNKNOWN, has 1 handler(s) for this service...
Instance "uat", status READY, has 1 handler(s) for this service...
Service "uat_XPT" has 1 instance(s).
Instance "uat", status READY, has 1 handler(s) for this service...
Service "uattest" has 2 instance(s).
Instance "uattest", status UNKNOWN, has 1 handler(s) for this service...
Instance "uattest", status READY, has 1 handler(s) for this service...
Service "uattest_XPT" has 1 instance(s).
Instance "uattest", status READY, has 1 handler(s) for this service...
The command completed successfully
i can remotely connected to database but on the same server tnsping is showing following error
$ tnsping UATTEST
TNS Ping Utility for IBM/AIX RISC System/6000: Version 10.2.0.5.0 - Production on 04-MAR-2011 11:59:09
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
/u01/app/oracle/product/10.2.0.1/db_1/network/admin/sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.8.17)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = uat)))
TNS-12535: TNS:operation timed out
or some time
ORA-12547: TNS: lost contact
remotely all the users are connected to listener but on the same server the operation is failed
I cant connect to other database using this tnsnames.ora file
can any one help me
regards
Bhushan
Edited by: user9176407 on Mar 3, 2011 10:38 PM

user9176407 wrote:
Thanks for the reply
In My server 3 database are there there a database by service name uat also present there
I check all the configuration the entries in my tnsnames.ora is as below
PREPROD =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.8.17)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = preprod)
UAT =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.8.17)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = uat)
UATTEST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.8.17)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = uattest)
conf_uat =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS =
(PROTOCOL = TCP)
(HOST = 172.16.8.17)
(PORT = 1521)
(CONNECT_DATA =
(SERVICE_NAME = uat)
(SID = uat)
also my listner file entries are
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u01/app/oracle/product/10.2.0.1/db_1)
(PROGRAM = extproc)
(SID_DESC =
(SID_NAME = uat)
(ORACLE_HOME = /u01/app/oracle/product/10.2.0.1/db_1)
(SID_DESC =
(SID_NAME = uattest)
(ORACLE_HOME = /u01/app/oracle/product/10.2.0.1/db_1)
(SID_DESC =
(SID_NAME = preprod)
(ORACLE_HOME = /u01/app/oracle/product/10.2.0.1/db_1)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.8.17)(PORT = 1521))
Ok, for your listener.ora file, above you have the SID_LIST and the LISTENER sections. But what is this that follows, below?
>
uat =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.8.17)(PORT = 1528))
SID_LIST_uat =
(SID_LIST =
(SID_DESC =
(SID_NAME = configdb)
(ORACLE_HOME = /u01/app/oracle/product/10.2.0.1/db_1)
which is working file
but i have an problem in my tnsname.ora file

Parameters of tnsnames.ora

hello. i am new in oracle 10g and i want to take advice. i see the setting parameters of tnsnames.ora on Oracle Net Manager and i set the tnsnames.ora with it.
i developed a client application working with remote oracle 10g database on windows platforms. i developet it on VisualStudio, this application can work with both ms sql and oracle 10g. the user chooses it. when the user chooses Oracle i must create connection string and connect to the remote db.
i can implement it with two way
1. i want only connection name which is defined in tnsnames.ora and connect over it.
2. i make an interface user set the simple and advanced settings of connection parameters and i can insert them into connection string.
which way should i use. i think that it is better to set all of parameters in my application because it will be easier for user. but i think about the future versions of oracle . there may be problems on them.
what do you advice me?
thanks.

Hello user "user518019":
I'm also new in the Oracle world but I have programming since a lot of years. I would recommend to you following a simple rule:
if your applicattion is very simple you must follow the simple way to connect to DB.
By using a "tnsnames.ora" you only need to know a DB name to connect to it. In the other hand, if your are using non-default ports o also like this (per example, a more complicated enviroment) you would need a more detailed box to especify address, port number, service name, etc, etc...
I suppose Oracle will continue using "tnsnames.ora" a lot of years, but this is only a impression. I hope send you some help with this.

Getting sqlplus to read tnsnames.ora

I have installed the instant client (version 11_1) on an Ubuntu box (9.04)
I have a tnsnames.ora file I would like to use with sqlplus.
What do I need to do to configure to get sqlplus to use my tnsnames.ora file?
When I strace the sqlplus process, I see that it tries accessing tnsnav.ora (in several locations)
but never tnsnames.ora. I have placed a copy of the tnsnames.ora file in /etc, but sqlplus is not
checking for a tnsnames.ora file in any directory.
I've tried putting:
network.directory_path TNSNAMES
in my ~/.sqlnet.ora file. Sqlplus is reading that file, but that had no effect.
Thanks!

Hi,
The default installation of tnsnames.ora is in:
${ORACLE_HOME}/network/adminAn example of an entrie:
XE =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = <host_name or IP>)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = <SID>)
)Also you should check [Oracle® Database Installation Guide 11g Release 1 (11.1) for Linux|http://download.oracle.com/docs/cd/B28359_01/install.111/b32002/toc.htm]
Regards,

Urgent : Is there any c++ parsers available for reading tnsnames.ora

I have to parse the tnsnames.ora and get the connection string , host name , instance name , port etc .. and store it in my local memory structure . Is there any c++ parsers available , which parses and gives the desired output or do i have write my own parser .

You're right...the database connections work fine if I define them manually rather than reading them from the tnsnames.ora file.
I was hoping to have many users running SQL Developer so using the tnsnames.ora file might save people's time and reduce the number of database connection-related support calls.
If worse comes to worse, I can create an XML file to define the database connections. The only drawback to this is that we have an automated procedure to update people's tnsnames.ora whereas there is currently no way to keep the XML file up-to-date.

Developing without Full client / tnsnames.ora

I am trying to develop an OCI application using Borland C++ Builder. I want to deploy and develop using Instant Client 10G without tnsnames.ora file. I have 2 PCs - NT4 & XP.
On the NT4 PC I had installed the full Oracle Client and was using the tnsnames.ora file and things were working fine. I've since uninstalled the full client and am now getting the "ORA-12154: TNS:could not resolve the connect identifier specified" error (using Instant Client)
The XP box has never had the full client installed, does not have a tnsnames.ora file but works fine using the same code.
I've been looking through this forum and note Justin Cave's comments that you can deploy but not develop using Instant Client but this seems to work fine on my XP box. (I am an Oracle novice so I could be missing something here).
I have also checked the FAQ on connection strings and think I have got that correct (same code works on 1 PC and not the other) and don't think I've set the enviroment variables TNS_ADMIN or ORACLE_HOME on either machine.

Hrm, interesting. It always used to be DBQ but it seems it might have changed to SERVER at some point.
Anyway, I tried this and it worked fine for me (using 10204)
TESTFILE.DSN
================
[ODBC]
DRIVER=Oracle in OraDb10g_home1
server=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=gdarling-pc2)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=orcl)))
TEST.VBS
==========
set con = createobject("adodb.connection")
con.open "filedsn=testfile;uid=scott;pwd=tiger;"
set rs = createobject("adodb.recordset")
rs.open "select user from dual",con
msgbox rs.fields(0).value
Note also that unless you really want to create a file dsn, you could also just use a dsnless connection string and pass that directly too:
set con = createobject("adodb.connection")
con.open "driver={Oracle in OraDb10g_home1};uid=scott;pwd=tiger;server=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=gdarling-pc2)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=orcl)))"
set rs = createobject("adodb.recordset")
rs.open "select user from dual",con
msgbox rs.fields(0).value
Hope it helps,
Greg

Sql Developer not reading right tnsnames.ora

I have both a local 9iv2 and a 10xe (app_express) databases installed. Oracle home is set to ora92 and therefore should be reading the tnsnames.ora file in c:\oracle\ora92\network\admin. However, I recently used SQL Developer to connect to the 10xe database, and now all it reads is the tnsnames.ora file in the oraclexe\....\network\admin directory.
Any suggestions as to how to get it to use the tnsnames.ora from the ora92 home again??
The only solution I can think of now is to create one tnsnames.ora file with all the connections I need and copy it to each place where a tnsnames.ora file has been installed (ora92, ver 8 server, oraclexe, designer, forms/reports installs - etc.) Any other suggestions would be appreciated. I don't know why it is not reading from the specified home.
Thanks
Glenn

Hi,
This should help.
Re: tns_admin
-kris

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.

TNS_ADMIN (path to tnsnames.ora) using Instant Client IGNORED

Hi,
I developed a simple utility which uses OCCI LIB from 10g release. I'm deploying it with Oracle Instant Client lite libraries.
Everything works fine when tnsnames.ora is present in the same dir. When I move it somewhere else and set TNS_ADMIN to that directory, it doesn't work anymore:
C:\uplob>set TNS_ADMIN=c:\tns;
C:\uplob>echo %tns_admin%
c:\tns;
C:\uplob>uplob u/p@xe 15 input.dat
Exception:12154 ORA-12154: TNS:could not resolve the connect identifier specif
ied
This seems very simple, but I still cannot determine why TNS_ADMIN is not being taken into account.
Thank you for any help with this issue,
david

I think for Windows ,
You may have to set this in MY-COMPUTER-->Advanced-Env-Variables
and reboot to take effect.
rgds

Use of tnsnames.ora

Similar Messages

Maybe you are looking for