Workflow Agent Listeners Fail With "ORA-01555 snapshot too old... And/Or "The agent could not be found WF_DEFERRED" (Doc ID 731661.1)

Last updated on DECEMBER 19, 2015

Applies to:

Oracle Workflow - Version 11.5.10.2 to 12.1.3 [Release 11.5.10 to 12.1]
Information in this document applies to any platform.

Symptoms

On 11.5.10.2:
When attempting to Start Agent Listener, it goes down abruptly and 
following error occurs in Agent Listener log file:

java.sql.SQLException: ORA-00604: error occurred at recursive SQL level 1
ORA-01555: snapshot too old: rollback segment number 1 with name "_SYSSMU1$" too small
ORA-06512: at "APPS.WF_EVENT", line 1527
ORA-06512: at line 1

 And/Or

Could not initialize queue handler
invoker -> oracle.apps.fnd.wf.bes.QueueHandlerException: Problem querying WF_AGENTS ->
oracle.apps.fnd.wf.bes.BusinessEventException: The agent could not be found: WF_DEFERRED

 
The issue can be reproduced at will with the following steps:
1. Try starting Agent Listener.
2. Agent Listeners going down suddenly.

Cause

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