LDAP versus TNSNAMES.ORA

Have a client with lots of Oracle all over the place. They have indicated they are looking at an "enterprise TNSNAMES.ORA" file. Not given an specifics on how they think it can be done/why they want it done.
Can Oracle use an LDAP directory to perform the name->IP mapping function of TNSNAMES? Is an enterprise TNSNAMES.ORA feasible?
I prefer email if you can. Thank you in advance for any insights/help in this regard.

Yes, Oracle can use LDAP (see "Net8 Administrator's Guide").
One could also use Oracle Names as "enterprise TNSNAMES.ORA", which I would rate higher, as it is native Oracle naming method. Also you can configure it with Net8 Assistant, i.e. not going into too much details about Net8 internals.
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Similar Messages

Linked Servers - Sql server 2005 to connect to Oracle 11g using ldap.ora instead of tnsnames.ora

We have a SQL Server 2005 64bit box that needs a linked server created to Oracle 11g 64bit box. I have all the Oracle client software installed and can successfully connect to the Oracle database using SQL+ on the SQL Server 2005 64bit box. When I create
the linked server and select the OraOledb.Oracle provider, I get the TNSNames error. The Oracle server does not use tnsnames.ora it uses OLAP.ora to resolve. How do I get Linked server to stop trying to connect via TNSNames and use the OLAP.ora file instead?
I can't find any articles for this specific issues. All Oracle examples tell you to use TNSNAMES. The Oracle server is not under my companies control so I can not force the vendor to use tnsnames instead of OLAP.

Hi,
Have you got a resolution?
Thank you.

Timeouts while using LDAP and TNSNAMES for names resolving

I use an OID for Oracle Names resolving at the client-side.
I tested some errorcases because there are no HA-features implemented for the OID.
So i have an LDAP.ORA with the adress and the ports of the OID.
My SQLNET.ORA has this content:
NAMES.DEFAULT_DOMAIN = <my_company_domian>
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (LDAP, TNSNAMES)So actually there is no problem. But when i turn off the OID-Server there iss a timeout of about 20 second to resolve the name.
So my problem is not the resolving. I only want to know if there is a possibility to minimize the timeout to switch between LDAP-name-resolving to tnsnames.ora-name-resolving?

thanks Oviwan but i think this problem couldn't be solved with a parameter.
@rgoogld:
I already feared that i have to live with that timeout.
But your options are interesting. In the future i will have 2 OIDs and in the first time the TNSNAMES.ORA-names-resolving as backup.
I already can test this because i have a productive OID and one for test-purposes. So at the moment i have two OIDs listet in my LDAP.ORA.
example:
DIRECTORY_SERVERS = (<server_name_oid1>:<Port1>:<Port2>, <server_name_oid2>:<Port1>:<Port2>)
DEFAULT_ADMIN_CONTEXT = ""
DIRECTORY_SERVER_TYPE = OIDThere is already a (about 20 seconds) timeout, when the OID1 is powered down or the services are stopped. The client honestly ask the second OID after the "timeout" and resolve the name.
2 OIDs+TNSNAMS or 1 OID+TNSNAMES in both cases your options could perhaps prevent the timeout. I'm not really a system administrator, but i can discuss it with my colleagues here.
Do you know a smart way to remove or repoint an DNS-entry in a windows enviroment. For such actions i have also to monitor the status of the OID-services or the servers and make the dns-changes if something is crashed.
At this moment i have no idea how to do this but perhaps you or someone else here have some tips for me.

Distributing new tnsnames.ora to 2000+ clients

Dear all,
We are in process of migrating from single instance to RAC. Following is configuration of single instance database 'orcl'
HUY =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = cc1001-hisdbs01)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = orcl)
While the one given below is tnsnames.ora of our RAC setup, to which we will migrate.
ORCL2 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = hisdbs02-vip)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
(INSTANCE_NAME = orcl2)
ORCL1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = hisdbs01-vip)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
(INSTANCE_NAME = orcl1)
HUY =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = hisdbs02-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = hisdbs01-vip)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
(failover=on)
(load_balance=on)
(failover_mode=
(type=select)
(method=basic))
What are short term and long term solutions.
Short term solution can be to put VIPs of both nodes of the RAC in DNS and let DNS do dynamic load balancing (round robin).
One of the long term solutions can be to have one directory mapped to all clients which contains tnsnames.ora and have TNS_ADMIN on client side pointed towards this directory containing tnsnames.ora
What are your recommendations? Please suggest.
Br,
Anjum

I'd strongly suggest looking in to
migrating to Oracle Internet Directory rather than
having 2000 client machines relying on localnaming.
That is a very good advice. Considering there are no
remaining network issues. And, since the machines are connecting to the database through the network, there should be limited network issues to contend with.
I also support Justin's advice. Especially since the use of Oracle's LDAP (installed as the Single Sign-on components of the App Server 10.1.2 infrastructire) is included in the 10g database license fee as per the Licensing manual.
If there are significant Oracle7 and Oracle8/8i installations still around, then parallel LDAP with ONAMES.

What should have in equal tnsnames,ora and listener.ora?

Hi forum members again I'm very new in oracle, and I'm trying to create a sucessfull net service name, using oracle net configuration assitant, but when I try to test it I got this error, .***"""ORA-12514: TNS:listener does not currently know of service requested in connect descriptor."""*** And I have read that tnsnames.ora and listener.ora should have some parameters in common, but exactly I don't know, Do you know what parameters should be? or The ORA-12514 problem , doesn't have relation with the tnsnames.ora and listener files?, If doesn't wich is the reason of this message?
By the way I put what contain these files:
---------------------------------------------------------------------------listener.ora
# listener.ora Network Configuration File: /opt/oracle/product/10.1.0.3/network/admin/listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = oracle.gentoo)
(ORACLE_HOME = /opt/oracle/product/10.1.0.3)
(SID_NAME = oracle)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
SAVE_CONFIG_ON_STOP_LISTENER = TRUE
TRACE_LEVEL_LISTENER = USER
/////////////////////////////////////////////////////////////////////////////tnsnames.ora
# tnsnames.ora Network Configuration File: /opt/oracle/product/10.1.0.3/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
NORACLE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = tux)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = noracle)
By the way what must be the username and the pasword that ask the ORACLE CONFIGURATION ASSINTANT to test the net service name? Must be the user name and password of the system user?
Thanks in advance

OK, here we go ... extra long as I intend to bookmark this and make reference, as this is a very common question ... skip to the bottom if you want my guess to the solution.
Oracle Net Services (formerly SQL*Net, Net8, Oracle Networking) has two parts - the client and the server side. I'll discuss the server first, then the client.
1) Server, and specifically Listener:
The Oracle Listener is a monitor that listens for Oracle service requests on one or more ports. Usually this is on TCP/IP port 1521. When it gets an Oracle request from any network client, it checks whether it's in the list of Oracle Services for which it is monitoring. If found, it will contact that service, request a connection for the client, tell the service and client where and how to connect, and get itself out of the loop.
Notes:
a) It can listen on behalf of any number of services;
b) A service can be a database instance, an EPG service (the DBMS_EPG is the replacement for Apache in the database in 10gR2), an external job, etc;
c) One listener can listen on behalf of multiple database instances;
d) The services can be listed in the LISTENER.ORA or they can self-register;
e) If databases self-register, they use the initialization parameter LOCAL_LISTENER
f) If self-registering, the listener should be up before the database
g) Shutting down the listener will stop future connections, but has no impact on existing ones.
One frequent point of confusion - a connection request on the local machine may loop out to the network and contact the listener, or it may bypass the listener entirely and use a bequeath adapter. The 'beq' connection is the 'normal' connection by "sqlplus / as sysdba" or "sqlplus system/manager" on the local machine (note that no @instance was used ... in *nix, that is derived from the $ORACLE_SID environment variable)
In your listener.ora, you specify global_dbname=oracle.gentoo and sid_name=oracle. I assume therefore you can find an initoracle.ora or spfileoracle.ora somewhere on your system.
2) Client:
A client that wants to connect to an Oracle service uses the client side of the Oracle Net Services. The definition of client includes: any Oracle client utiltiy (SQLPlus, SQLLoad, Forms, Reports, etc.); an Oracle database instance that wants to make a external procedure call or a dblink; third party tools such as ODBC and JDBC.
In SQL*Net version 1 the connection was made by specifying the target in the connect string ("user/password@host:listener_port:sid") and that is also used these days by many JDBC drivers, especially the Oracle Thin JDBC driver. Oracle's Easy connection mechanism uses a similar variant.
Since SQL*Net Version 2, Oracle has supported the concept of alias translation. Basically it's very similar in concept to DNS - give it the name of the service and tell it where to find the translation table. The translation tables include TNSNAMES.ORA, ONAMES servers (deprecated in 10g), LDAP usng Oracle's OiD. The choice of translation table, and alternate order if the lookup fails in one, is stored in the SQLNET.ORA (if one exists).
Assuming TNSNAMES.ORA, the chain of events is:
- get the alias to look up (in your case NORACLE);
- if the SQLNET.ORA has a DEFAULT_DOMAIN setting, (often =WORLD) append a dot and that value to the alias;
- go to the TNANSMES.ORA file pointed by the TNS_ADMIN variable (environment or registry), or (if not set) the one in the $ORACLE_HOME/network/admin directory;
- look up the first occurance of the alias;
- if found, use the protocol specified to request a connection to the host, usin DNS to unravel the host to an IP address if necessary (in your case TCP/IP, to TUX) ;
- if host connection if made, connect to the listener that is configured for that port (in your case 1521);
- if listener is there, ask it for connection to the service (in your case, you are asking for instance 'noracle');
i if the listener knowwss about the service, it will hand off the request.
Your problem appears to be asking for instance 'noracle' in the tnsnames but listeneing for 'oracle' at the listener. Of course, I can not see any auto-registered instances which you would get from "lsnrctl status" on the server.

Max number of entrys in tnsnames.ora ?

Does anyody know whether there exists a maximum number of entrys in the tnsnames.ora?
Any experiences when it gets too big ?

I'd be willing to wager that you will hit the human limit long before you hit a technical limit. I get fidgety when there are more than 50 entries in my tnsnames.ora file because it becomes a royal pain to find anything.
Oracle has LDAP (and used to have Oracle Names servers) to allow organizations to centrally manage TNS aliases without having tnsnames files. If you have more than about 20 datbabases that people can connect to, I would strongly consider using something like this rather than pushing tnsnames files to clients. If you have more than a few dozen client machines, I would strongly consider moving away from tnsnames files as well.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Replace local tnsnames.ora-files with OID

Hi there,
I would like to replace our local tnsnames.ora-files with an central OID-Instance. I know I will have to use the ldap.ora on clientside, but how can I add service names to the OID?
Is there any guide or manual which describes this functionality?
Best Regards

You need the Net Configuration Assistant, not Net Manager!
- select configure Directory Usage
- select correct type and name, and port(s)
- select correct default context (NOT cn=OracleContext!)
Next, you should be able to navigate to Local Naming, select an entry from your tnsnames.ora, and select from the mennu: Command->Directory->Export Net Service Names
- select one or more entries to be migrated

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

Creating a service ; What needs to be added to tnsnames.ora and JDBC url?

DB version: 11.2.0.2
OS platform : Solaris 10
We have a 2 node RAC.
DB name   = mbsprd
Instance1 = mbsprd1
Instance2 = mbsprd2I want Instance 1 (mbsprd1) to be used for our OLTP application and Instance 2 (mbsprd2) to be used for another application of DSS nature.
Based on the syntax
srvctl add service -d <dbname> -s <ServiceName> -r <Preferred Instance> -a <Available Instance>I am going to create 2 services
-- Creating a service called OLTP
srvctl add service -d mbsprd -s OLTP -r mbsprd1 -a mbsprd2-- Creating a service called DSS
srvctl add service -d mbsprd -s DSS -r mbsprd2 -a mbsprd1-- Starting the services
srvctl start service -d mbsprd -s OLTP
srvctl start service -d mbsprd -s DSSI guess the above steps are enough to configure a service at the server side.
I would like to know what needs to be done at the client side.
Currently the tnsnames.ora file and JDBC url used by our clients are shown below. What needs to be added to tnsnames.ora file and jdbc URL to start using services configured above?
-- SCAN based TNS entry
mbsprd =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (COMMUNITY = tcp.world)
        (PROTOCOL = TCP)(Host = p148149-scan.tpam.net) (Port = 36964))
    (CONNECT_DATA =
      (SERVER       = DEDICATED)
      (SERVICE_NAME = mbsprd)
      (FAILOVER_MODE=(TYPE=SELECT)(METHOD=BASIC))
-- TNS entry based on local listener
-- Instance 1
mbsprd1 =
(DESCRIPTION =
   (ADDRESS_LIST =
   (ADDRESS =(PROTOCOL = TCP)(HOST = hsolarp148-vip)(PORT = 36973))
   (CONNECT_DATA =
         (SERVICE_NAME = mbsprd)
         (INSTANCE_NAME = mbsprd1)
-- Instance 2
-- TNS entry based on local listener
mbsprd2 =
(DESCRIPTION =
   (ADDRESS_LIST =
   (ADDRESS =(PROTOCOL = TCP)(HOST = hsolarp149-vip)(PORT = 36973))
   (CONNECT_DATA =
         (SERVICE_NAME = mbsprd)
         (INSTANCE_NAME = mbsprd2)
)JDBC entry for RAC
jdbc:oracle:thin:@p148149-scan.tpam.net:36964:mbsprd -- Alternative version used by some clients because the above had 'some issues'
jdbc:oracle:thin:@(DESCRIPTION=(LOAD_BALANCE=on)(ADDRESS=(PROTOCOL=TCP)(HOST=p148149-scan.tpam.net) (PORT=36964))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=mbsprd)(FAILOVER_MODE =(TYPE = SELECT)(METHOD = BASIC)(RETRIES = 180)(DELAY = 10))))

OLTP =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = p148149-scan.tpam.net)(PORT = your_port_number))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = OLTP)
DSS =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = p148149-scan.tpam.net)(PORT = your_port_number))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = DSS)
)JDBC entry for RAC
jdbc:oracle:thin:@p148149-scan.tpam.net:36964:service_name
jdbc:oracle:thin:@new_tns_entry_description(if you would like to connect the database with particular service)
try this and let us know any issues,

Multiple entries for a single Host in tnsnames.ora

I'm part of the end user computing and we are in the process of making a consolidated tnsnames.ora file as part of our migration from Windows XP to 7.
The following two entries are to the same host, but are named different and use different ports, we can't locate the original programmer that set it up.
I need to know if this would cause conflicts or not?
PYRPROD.WORLD =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(Host = [same hostname])(Port = 1521))
    (CONNECT_DATA =
      (SID = pyrp1)
PYRP1 =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = [same hostname])(PORT = 1526))
    (CONNECT_DATA =
      (SERVICE_NAME = pyrp1)

TekWarrior wrote:
I'm part of the end user computing and we are in the process of making a consolidated tnsnames.ora file as part of our migration from Windows XP to 7.
The following two entries are to the same host, but are named different and use different ports, we can't locate the original programmer that set it up.
I need to know if this would cause conflicts or not?
PYRPROD.WORLD =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(Host = [same hostname])(Port = 1521))
    (CONNECT_DATA =
      (SID = pyrp1)
PYRP1 =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = [same hostname])(PORT = 1526))
    (CONNECT_DATA =
      (SERVICE_NAME = pyrp1)
TekWarrior wrote:
I'm part of the end user computing and we are in the process of making a consolidated tnsnames.ora file as part of our migration from Windows XP to 7.
The following two entries are to the same host, but are named different and use different ports, we can't locate the original programmer that set it up.
I need to know if this would cause conflicts or not?
PYRPROD.WORLD =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(Host = [same hostname])(Port = 1521))
    (CONNECT_DATA =
      (SID = pyrp1)
PYRP1 =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = [same hostname])(PORT = 1526))
    (CONNECT_DATA =
      (SERVICE_NAME = pyrp1)
It won't cause any problem.

Cannot find tnsnames.ora error message

We are using oracle 10.2.0.1 via Toad. I get a cannot find tnsnames.ora file error message and see only a tnsnames.ora file in the sample file under the c:\ORACLE\product\10.2.0.1\NETWORK\ADMIN\ directory.
Do I need to create this file, and if so how do I do this?
Thanks in advance for your help
regards,
user12943453

Do I need to use the TNSNames Editor? No need for tnsnames.ora or SQL*net to access local DB
Can I just use direct connect and the sqlnet editor?YES!

EM doesn't allow creation of tnsnames.ora entry with service name orcl11gr2

Dear all,
I'm trying to create a net service name with EM Database Control, via Net Services Administration link. On the service name field, under the 'Edit Net Service Name' screen, I key in orcl11gr2, and it throws the the following error:
Validation Error
Examine and correct the following errors, then retry the operation:
Service Name - Specify a valid service name.
I wonder what is the extra validation that EM is checking. I assume it's checking the number of characters to be 8 characters or less.
Also, because of this extra validation that is in EM, all tnsnames.ora entry that have service name = orcl11gr2, I will not be able to use EM to modify them, as I will get the same above error.
But why does Oracle implements this extra validation, when the same validation is not implemented on other Oracle tools? For instance:
1. dbca allows me to create a database with instance_name greater than 8 characters, and the outcome of initialization parameters will be as follow:
db_name=orcl11gr -- truncated to 8 characters
instance_name=orcl11gr2
db_unique_name=orcl11gr2
service_names=orcl11gr2
2. Oracle Net Manager supports service name of orcl11gr2. The created Net Service Name, I have no problem connecting to the database.
3. Listener support orcl11gr2 service name
I'm using Oracle 11g R2 (11.2.0.1.0) for Microsoft Windows (x64), running on Windows 7.

For your reference, here is the bug numbner: 10278345.
-Mughees

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
Below is the export from the About box in SQL Developer:
About
Oracle SQL Developer 1.5.1
Version 1.5.1
Build MAIN-5440
Copyright © 2005,2008 Oracle. All Rights Reserved.
IDE Version: 11.1.1.0.22.49.42
Product ID: oracle.sqldeveloper
Product Version: 11.1.1.54.40
Version
Component Version
========= =======
CVS Version Internal to Oracle SQL Developer (client-only)
Java(TM) Platform 1.6.0_07
Oracle IDE 1.5.1.54.40
Versioning Support 1.5.1.54.40
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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.

Best Practice to configure tnsnames.ora on client of MAA environment in 10g

Hi,
I have a MAA environment, 1 RAC Primary of 2 nodes and 1 RAC standby of 2 nodes too. I want to configure the tnsnames.ora on clients (we have many clients on each PC) and I need to configure the tnsnames.
I have read some papers but the information is not clear regarding to configure the tnsnames on clients. I just want to have only one entrie on tnsnames that I can use on clients to connect to RAC Primary and/or Standby depending on what site is primary in that moment, I was thinking in something like this:
SALES.WORLD =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = site1a)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = site1b)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = site2a)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = site2b)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = sales.world)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
Where site1 is RAC Primary now, and site2 is standby. But in case of switchover, I want that clients recognize automatically to which site connect.
I was thinking to stop listeners on site that is not primary on that moment.
The question is if this is the best practice on this scenario?.
Thanks for your advice.
Luis

Hi Louis,
you need to setup a service with clusterware. On both sides: primary and standby.
On primary you start them. On standby the services are also configured but stopped.
In case of switchover or failover, data guard will notice clusterware to bring them up.
You need to use this service name in your clients tnsnames.
Another issue are TCP timeouts, to protect against them you use
outbount_connect_timeout in your sqlnet.ora
Also have a look at
http://www.oracle.com/technology/deploy/availability/pdf/MAA_WP_10gR2_SwitchoverFailoverBestPractices.pdf
HTH Mathias

LDAP versus TNSNAMES.ORA

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