How do you fix error ORA 12154 TNS could not resolve connect identifier specified?

The Solution

Table of Contents

Make sure that “TNSNAMES” is listed as one of the values of the NAMES. DIRECTORY_PATH parameter in the Oracle Net profile (SQLNET.
Verify that a TNSNAMES.
Check that the net service name used as the connect identifier exists in the TNSNAMES.
Make sure there are no syntax errors anywhere in the TNSNAMES.

What is the error ORA 12154?

The “ORA-12154: TNS:could not resolve the connect identifier specified” Oracle error is a commonly seen message for database administrators. When this occurs, there’s an issue with creating a connection with one of your Oracle services or database instances.

How do I fix an ORA error?

Learn the cause and how to resolve the ORA-06512 error message in Oracle.
…
The options to resolve this Oracle error are:

Fix the condition that is causing the unhandled error.
Write an exception handler for this unhandled error.
Contact your DBA for help.

Where is TNS ORA file located?

ORACLE_HOME/network/admin directory

By default, the tnsnames. ora file is located in the ORACLE_HOME/network/admin directory.

How can I update Tnsnames Ora file?

Updating the tnsnames. ora files

From the Oracle Home, open the file tnsnames. ora. Typically, the default location of the file tnsnames. ora is <ORACLE_HOME>\NETWORK\ADMIN\.
Edit the entry in tnsnames.ora as follows: Replace HOST=machine_name. with HOST=virtual_IP_address.
Save and close the tnsnames. ora file.

What is TNS ORA file in Oracle?

The tnsnames.ora file is a configuration file that defines connection parameters for your Oracle database instance. By default, tnsnames.ora resides in the following location: Solaris. Oracle_HOME/network/admin. Windows.

How do I fix TNS listener does not currently know of service requested in connect descriptor?

Action: Wait a moment and try to connect a second time. Check which services are currently known by the listener by executing: lsnrctl services. Check that the SERVICE_NAME parameter in the connect descriptor of the net service name used specifies a service known by the listener.

How do you resolve ORA 12154?

Resolution

Option #1. Make sure that the TNSNAMES. ORA file exists and is in the correct directory.
Option #2. Make sure that the service name that you are connecting to is included in the TNSNAMES. ORA file and that it is correctly defined.
Option #3. Make sure that there are no syntax errors in the TNSNAMES. ORA file.

How do I install TNS Listener service?

Configuring Access to Oracle JServer

Start Oracle Net Manager.
In the navigator pane, expand Local > Listeners.
Select a listener.
From the list in the right pane, select Listening Locations.
Click Add Address.
Select the TCP/IP or TCP/IP with SSL protocol from the Protocol list.

How do I install Tnsnames Ora file?

Specifying a Connection by Configuring a tnsnames. ora File

Run Oracle Universal Installer.
Select the Custom installation type.
In the Available Product Components list, select Oracle Network Utilities and click Next.
In the Summary window, click Install, then click Exit and Yes to exit Oracle Universal Installer.

How do I manually create Tnsnames Ora?

Procedure

FTP the following file from your Oracle server:
Add the following lines:
Replace the string yourhost in the line (HOST = yourhost ) with the name of your Oracle server.
(optional) Replace the default port number 1521 in the line (PORT = 1521 ) with your required port number.
Write and quit the file.

What is TNS Service name in Oracle?

What is a TNS? It is an alias. Like a hostname is an alias for an IP address, a TNS is an alias for an OCI (Oracle Call Interface) connection string. This string identifies the database server and database instance to connect to.

How do I know if TNS listener is running?

Do the following:

Log on to the host where the Oracle database resides.
Change to the following directory: Solaris: Oracle_HOME/bin. Windows: Oracle_HOME\bin.
To start the listener service, type the following command: Solaris: lsnrctl START. Windows: LSNRCTL.
Repeat step 3 to verify that the TNS listener is running.

How do I add a service name to my listener?

Check the Listener creation.
Start the Listener with the port 1551.
Create a tns names entry.
Configure the parameter local_listener.
Check the Listener status.

What is a TNS error?

ORA-12154: TNS:could not resolve the connect identifier specified. This is one of the most common Oracle errors and it is basically telling you that you are trying to connect to a database name that is unknown to the system. The most common cause are typos in your connection string or network configuration files.

How do I restart TNS listener?

How do I fix Oracle listener?

The Solution
First, make sure that the listener is up and running. To do this, go to the Control Panel into Services under NT or listener control program (LSNRCTL). If the listener is up and running, the problem may lie with the listener not having been associated with the correct instance or protocol.

Can’t find Tnsnames Ora file?

If you have run NETCA and cannot locate the tnsnames. ora file, check to see if the tns_admin parameter has been set to specify a different directory. If you have not run NETCA, do so to create the tnsnames. ora file.

How do I manually create TNSnames Ora?

How do I get TNS string?

You can find this file in ${ORACLE_HOME}/network/admin on most systems. You should be able to find (or define) the tnsname for the instance you’re using there. Have the DBA’s check the ${ORACLE_HOME}/network/admin on the system you’re be deploying the package to.

How do I start the oracle listener service?

To start Oracle Net Listener, do the following:

Start the listener with the Listener Control utility.
Start the database, as follows:
Confirm that database service registration with the listener has completed using the Listener Control utility using the following command: LSNRCTL> SERVICES [listener_name]

What is TNS service name?

TNS Service name is the local name of the remote Oracle service. To specify the TNS Service name you need to start “Oracle Net Configuration Assistant”.

How do I check my TNS Listener status?

How do I enable TNS listener?

How do I connect to TNS?

ora file manually.

Start SQL Developer and go to Tools > Preferences;
In the Preferences option, expand the Database component, click on Advanced, and under the “Tnsnames Directory” browse to the folder where your tnsnames.
Restart SQL Developer;
Now in SQL Developer select Connections and click New Connection;

How do you fix error ORA 12154 TNS could not resolve connect identifier specified?