IBM 000-8697 User Manual

IBM Informix OnLine Database Server Administrator’s Guide

 illustrates the writing sequence of the logical log records during

a heuristic rollback. (Refer to

rollback.) Since a heuristic rollback only occurs after the participant sends a
message that it can commit, and the coordinator sends a message to commit,
the first phase of this protocol is the same as that shown in

, the heuristic rollback is assumed to be the consequence of a long-

transaction condition that occurs at the Participant One (P1) OnLine database
server. Only the interactions between the coordinator and the P1 participant
are shown.