ORA-12519 With Shared Server and Dispatcher

(Doc ID 565462.1)

Last updated on AUGUST 25, 2017

Applies to:

Oracle Net Services - Version to [Release 9.2 to 11.1]
Information in this document applies to any platform.
This problem can occur on any platform.


When configuring Shared Server (formerly, MultiThreaded Server or MTS), you set the correct Shared Server parameters such as the examples below:
shared_servers = 10
max_dispatchers = 10
max_shared_servers = 20

However, when you try to connect with a Shared Server process from the client or locally, you get the following message displayed:

TNS-12519: TNS:no appropriate service handler found

The listener log will display this error.

Also, if you run "lsnrctl services" on the listener, you might only see dedicated connections as follows:
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=myhostname)(PORT=1522)))
Services Summary...
Service "orcl10" has 1 instance(s).
   Instance "orcl10", status UNKNOWN, has 1 handler(s) for this service...
         "DEDICATED" established:0 refused:0
            LOCAL SERVER
The command completed successfully


You are not running a default listener address (or port).


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