UCP Delay in Processing ONS Events During Data Guard or RAC Failover Using FCF
Last updated on MARCH 08, 2017
Applies to:Universal Connection Pool - Version 22.214.171.124.0 and later
JDBC - Version 126.96.36.199 and later
Information in this document applies to any platform.
***Checked for relevance on 22-Jan-2014***
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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