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UCP Delay in Processing ONS Events During Data Guard or RAC Failover Using FCF (Doc ID 1380527.1)

Last updated on JANUARY 30, 2022

Applies to:

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


The Universal Pool (UCP) may experience delays in processing the FAN events received via the ONS resulting from a DataGuard or RAC failure ( simulated by a kernel panic scenario).  As a result, this may impact the recovery time, as the UCP is not promptly closing the invalid connections.

The UCP is configured with a JDBC/thin driver and is using the Fast Connection Failover ( FCF).
It was verified using ONS logging and JDBC logging that the FAN events have been sent. However there is a delay of several minutes between the sending of the events by the ONS and the receiving of these events by the JDBC driver.




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