Thursday, May 19, 2016


Q. Common Listener Issues You Faced ?

It is not very common to find listener-related problems in Oracle, and most connectivity-related problems are generally associated with database server problems, such as shortage of memory.

Here are some common errors:

    ORA-12500 TNS:listener failed to start a dedicated server process  - This is generally associated with memory shortages or permission problems in UNIX.

    ORA-3113 end-of-file on communication channel – This is generally a network failure

    TNS-12547 TNS:lost contact – This can be corrected by increasing the connect_timeout_listener parameter.

    TNS-12224 TNS:no listener – Clients will get this message if the listener process is not running.

    ORA-12570 TNS:packet reader failure – This is a network problem.

    ORA-12571 TNS:packet writer failure – This is a network problem

Note that in many cases, a failure of the listener will not be logged on the database server, but will instead be presented as a message on the client workstation.  Hence, the vast majority of listener errors are reported by end-users.

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