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ORA-12519: TNS:no appropriate service handler found tips

Oracle Error Tips by Burleson Consulting

 

Oracle docs note this about ORA-12519:

ORA-12519: TNS:no appropriate service handler found

Cause: The listener could not find any available service handlers that are appropriate for the client connection.

Action: Run "lsnrctl services" to ensure that the instance(s) have registered with the listener, and are accepting connections.

  • ORA-12519 and Shared Servers:  What has commonly happened here is that moving from a dedicated server to a shared server (MTS) ORA-12519 is thrown even though you have correctly changed al of the necessary parameters. 

    ORA-12519 and listener configuration:  ORA-12519 occurs here because the listener has not been properly set to the default port and the PMON automatic listener registration fails with ORA-12519.  You may also notice with this ORA-12519 error that the RDA LOCAL_LISTENER reads NULL.

    To resolve ORA-12519, register the listener manually after the MTS change if you still wish to use non-default ports.

    ORA-12519 and "processes" parameter:  Also, on Oracle DBA Forums, there is information referring to ORA-12519.  Here, it is pointed out that ORA-12519  can be caused by low "processes" values, which can be resolved by increasing he DB parameter, "parallel_max_servers".  Also, ORA-12519 can be thrown because of DB and client versions which do not match.


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