A clean shutdown of a Replicat ensures that all threads stop at the same transaction boundary in the trail, known as the global watermark. This is defined as the synchronized point where all records before this position were either committed or ignored by all of their respective threads. If a clean shutdown is not possible, you can use the SYNCHRONIZE REPLICAT command to return all of the threads to the position of the thread that made the most recent checkpoint. This command is valid for coordinated, integrated, and parallel Replicats. See Synchronizing Threads After an Unclean Stop for more information about recovering a coordinated Replicat group.