Conditions that result in a heuristic rollback

The following two conditions can cause a heuristic rollback:
  • The logical log fills to the point defined by the LTXEHWM configuration parameter. (See the topics about configuration parameters in the HCL Informix® Administrator's Reference.) The source of the long-transaction condition is a piece of work being performed on behalf of a global transaction.
  • An administrator executes onmode -z session_id to stop a database server thread that is executing a piece of work being performed on behalf of a global transaction.

In either case, if the piece of work has already sent a can commit message to its coordinator, the action is considered a heuristic decision.


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