How to resolve "TNS-12541 : TNS : no listener" error

To resolve "TNS-12541: TNS: no listener" error we need to check whether our listener is up and running.

Step 1) To check whether our listener is up or running, we need to run below command

Command : - ps -ef | grep tns

Example: -

Note: - In this case, my listener is not started,  So I need to start my listener

Step 2) To start the listener, we need to run below command

Command : - lsnrctl start

Example: -

Step 3) Now again check the status of listener whether it is up and running, It should be up and running

Command: - ps -ef | grep tns

Example: -

Note: - Now my listener is up and running properly