Couldn't connected to database 10g

Hi all,
I have oracle home with Tnsname.ora file specified net_service_name
to connect both database version 9i and 10g ,so when I connect to database 9i
by SQL * Plus ,it's ok but when try to connect to database 10g ,it does not work
and SQL * Plus show error message "ORA-12203: TNS:unable to connect to destination" ,if I change home selector to the other home ;such as Discoverer home ,it can connect to database 10g but some eariler oracle 16-bit application
like OFSA can not use.
Thank you
Mcka

12203, 00000, "TNS:unable to connect to destination"
// *Cause: Invalid TNS address supplied or destination is not listening.
// This error can also occur because of underlying network transport
// problems.
// *Action: Verify that the service name you entered on the command line
// was correct. Ensure that the listener is running at the remote node and
// that the ADDRESS parameters specified in TNSNAMES.ORA are correct.
// Finally, check that all Interchanges needed to make the connection are
// up and running.

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Problem about using Oracle Form 6i to connect Oracle Database 10g express.

Sorry to interrupt all of you.
I have encountered a problem about using Oracle Form 6i to connect Oracle Database 10g express.
As I would like to
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The test did not succeed.
ORA-03106: fatal two-task communication protocol error
There may be an error in the fields entered
or the server may not be ready for a connection.
You can check the server and retry, or continue.
After I google it, I still have no idea how to solve the problem. I would like to ask, could anyone mind providing some hints or solution to address the issues.
Thanks for your assistance in advance.

I don't believe the Net8 Easy Config (NEC) will create a compatible entry in the tnsnames.ora. I have Forms 6i running successfully against a 10g Express database, but I did not use the NEC - I created the entry myself. Here is the entry I use:
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If someone's response is helpful or correct, please mark it accordingly.

How to Connect Oracle Database 10g with using Oracle Dev 10g

Hello there,
I have problem with connection on database 10g using oracle dev 10g on the same server.
The message is: TNS... bla..bla... it means not connect.
Please advice
Regards
Leksono

just simple
copy the from the database instance the tnsnames.ora
file's entried into developer folders tnsnames.ora
file and you can connect to DBFirst of all there is no such error as TNS... bla..bla... it means not connect.
there are several errors for the tnsnames, post the exact error
And it is not recommended that you copy it from the database's tnsnames file, it doesn't always work.
to configure the tnsnames.ora you have 2 ways, manual and GUI.
For GUI use the Net configuration assistance from your Devsuite home and for manual you need edit the tnsnames.ora file usually under %ORACLE_HOME%/NETWORK/ADMIN
You need to specify the connection string name, the hostname and the database SID name. It should look something like this.
<connection identifier> =
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)Regards,
Tony

Forms 6 not connecting with Database 10g

I can not connect Oracle forms 6 with database 10g

795192 wrote:
I can connect to sql plus but i cannot connect my forms 6 with database 10g. getting the following error:
ORA-12154: TNS: could not resolve service name=================================
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.
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=================================
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.
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 =
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 (CONNECT_DATA =
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)Now, when you issue a connect, say like this:
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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 request arrives at 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, you'll be connected.
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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"
=====================================

How to Connect Oracle Database 10g Express Edition ?

From example
http://www.oracle.com/technology/obe/hol08/dotnet/getstarted-c/getstarted_c_otn.htm
using Oracle.DataAccess.Client; // ODP.NET Oracle managed provider
using Oracle.DataAccess.Types;
string oradb = "Data Source=ORCL;User Id=hr;Password=hr;";
OracleConnection conn = new OracleConnection(oradb); // C#
conn.Open(); <== Connect Error
Error Message "ORA-12154: TNS:could not resolve the connect identifier specified"
I used
Visual Studio 2005
Oracle Database 10g Express Edition
setup "Oracle Developer Tools for Visual Studio .NET with ODAC 10.2.0.2.21"
Best Regards,
Edited by: user1949694 on 8 ก.ย. 2552, 9:20 น.

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Hi,
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Hi Sam,
Sometimes it is only because you have not set the environment correctly (ORACLE_HOME, ORACLE_SID).
Is your TNSNAMES.ORA correct?
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If you don't see the LSNR processes start the listener.
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regards
Wolfgang

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Hello
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<%@ page language="java" %>
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Most probably your URL is screwed.
In order to find out in your catch statement add this code:
catch (SQLException e)
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evnafets

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nicole4 wrote:
Hi,
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Dblink for database 10G from database 8i

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I want to connect it to the database 10g to oracle 9i

How can i do that? is it possible???
I am getting error TNS-12541: TNS: no listener
database on my laptop is 10g XE ADDITION on XP
and on server it is 9.2.0.2
As far as I know client software should be lesser or equal

user9007339 wrote:
How can i do that? is it possible???
I am getting error TNS-12541: TNS: no listener
database on my laptop is 10g XE ADDITION on XP
and on server it is 9.2.0.2
As far as I know client software should be lesser or equalThe relationship bet. client and server is even looser than that.
Use copy and paste to show the actual sqlplus command you use, and the exact response.
Here's a primer on how a tns connection works. This should help you systematically track down the problem
=================================
Assume you have the following in your tnsnames.ora: (client machine)
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'. Next, tns sends a request 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 request arrives at 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, you'll be connected.
A couple of important points.
First, the listener is a server side only process. It's entire purpose in life is the 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, 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. That would be like the telephone company building a separate switchboard for each customer.
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.
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"

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Hi,
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I've installed both form builder and database 10g express.
I tried to connect form builder to HR sample database in 10g express with the following:
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I can't connect form6i to Oracle Database 10g
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Error Detail:
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Read this thread:
connecting form 6i to oracle database 10G express edition

Couldn't connected to database 10g

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