Migration copies objects from a source model to a destination model. For the source model, migration is a read process. For the destination model, migration is an update process. Periodic commits are not performed because of the difficulty of detecting and correcting the results of a partial migration. Because there are no periodic commits, migration can quickly cause contention across the entire encyclopedia. Trial migration executes the same logic as migration except a rollback is done at the end of processing, which approximately doubles the processing time.
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