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

Last updated on MARCH 08, 2017

Applies to:

Universal Connection Pool - Version 11.2.0.1.0 and later
JDBC - Version 11.2.0.1 and later
Information in this document applies to any platform.
***Checked for relevance on 22-Jan-2014***

Symptoms


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.

Cause

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