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RAC: ORA-12520 Errors Due to Misconfiguration of LOCAL_LISTENER at Instance (Doc ID 885431.1)

Last updated on AUGUST 28, 2023

Applies to:

Oracle Net Services - Version to [Release 10.2 to 12.2]
Oracle Database - Enterprise Edition - Version to [Release 12.2]
Information in this document applies to any platform.
This problem can occur on any platform.


After service <SERVICE_NAME> is relocated to the new node, the listener on the new server does not show any
handler for the service.

srvctl relocate service -d <db_name> -s <SERVICE_NAME> -I <INSTANCE>1 -t <INSTANCE>2

The output of lsnrctl status on new node:

-bash-3.00$ lsnrctl status LISTENER

Service "<SERVICE_NAME.DOMAIN>" has 1 instance(s).
Instance "<INSTANCE>2", status READY, has 0 handler(s) for this service...

Testing the connection fails with the ORA-12520 error:

SQL> conn <username>@<service>
Enter password: <password>
ORA-12520: TNS:listener could not find available handler for requested type of server



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