TNS-12521 Errors after a Dataguard Switchover of Primary and Standby Databases while running a JDBC application using UCP (Doc ID 2156014.1)

Last updated on MARCH 08, 2017

Applies to:

Universal Connection Pool - Version 11.2.0.4.0 and later
Information in this document applies to any platform.

Symptoms

On an Oracle Data Guard consisting of a primary and standby databases:

After switching over the primary role to the data guard, this error on the listener log file started to be seen:


The issue cannot be reproduced after restarting the application.  ( The UCP pools are rebuilt when the applications are restarted)

Cause

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