How do I enable TNS listener?

Do the following:

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

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

Action:

1. Wait a moment and try to connect a second time.
2. Check which services are currently known by the listener by executing: lsnrctl services.
3. 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 I start Oracle listener service in Linux?

To start or stop the listener at the command line:

1. Open a command window.
2. Follow the steps listed in “Configuring the Operating System Environment Variables .”
3. Enter either of the following commands, depending on whether you want to start or stop the listener: lsnrctl start lsnrctl stop.

What is ORA 12514 TNS listener does not currently know of service requested in connect descriptor?

ORA-12514 means that the listener cannot find any matched service with yours, so it cannot establish a connection with the database for you. As a result, it responds ORA-12514 to alert the failed connection. Also, this could be due to using the wrong service name.

What is difference between listener Ora and Tnsnames Ora?

ora is a file that has to be configured on oracle server to resolve incoming connection requests to the listener on Oracle Sever. tnsnames. ora is a file that has to be configured on the client computer to tell the client computer the address where the listener is located.

How can I tell if Oracle is running?

1. Check the oracle process runs: On Un*x: ps -ef|grep pmon. On Windows: tasklist|findstr /i oracle.
2. Go to ORACLE_HOME/bin and run: ./ sqlplus /nolog. If after login you get errors, then the database does not run: SQL*Plus: Release 11.2.0.1.0 Production on Sat Feb 31 21:61:61 2014 Copyright (c) 1982, 2014, Oracle.

How do I install Oracle listener service in Windows?

To start Oracle Net Listener, do the following:

1. Start the listener with the Listener Control utility.
2. Start the database, as follows:
3. 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 an ora-12541 error?

An ORA-12541 error occurs when the listener for the destination server is down or unreachable. This can be due to the listener not being started or being incorrectly configured, or it can be due to a network connection problem. Two likely reasons for the error: the database was briefly unavailable at the time when you tried to access.

What causes ‘ora-12541 TNS TNS no listener’ error?

There are many potential causes for ‘ORA-12541 TNS:no listener’ errors. For example: Scenario #1 – Tnsnames.ora file does not have the correct information required to connect to Scenario #2 – Oracle server has more than one network card, but only 1 card is configured

How to solve Oracle listener connection problem?

Ask Oracle DBA to check the Oracle server, to solve connection problem. NOTE: Oracle is a third party (non-IBM) piece of software. IBM cannot give any official advice on third-party (non-IBM) products. However, in one customer’s case, the problem was solved by deleting and re-creating the Oracle Listener.

Why do I receive an error message when starting a listener?

If the listener has been started and you continue to receive the error message, check that the destination address in the TNSNAMES.ORA file on the client system matches one of the listening addresses listed in the LISTENER.ORA file on the database server.