Integration Server 10.3 | JMS Client Development Guide | Exactly-Once Processing for JMS Triggers | Document History Database for Use with JMS Triggers | What Happens when the Document History Database Is Not Available for a JMS Trigger?
 
What Happens when the Document History Database Is Not Available for a JMS Trigger?
If the connection to the document history database is unavailable when Integration Server attempts to query the database, Integration Server considers the lack of availability to be a transient error in the preprocessing phase of trigger execution. How Integration Server responds to the transient error depends on the configured transient error handling for trigger preprocessing.
For more information about transient error handling during trigger preprocessing, see Transient Error Handling During Trigger Preprocessing.