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 FEBRUARY 19, 2019
Applies to:Universal Connection Pool - Version 18.104.22.168.0 and later
Information in this document applies to any platform.
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)
To view full details, sign in with your My Oracle Support account.
Don't have a My Oracle Support account? Click to get started!
In this Document