If the roll forward set has not been rolled forward far enough to be consistent with the database, the undo phase cannot occur.

如果前滚集前滚得不够远，无法与数据库一致，则不会出现撤消阶段。

youdao

If the roll forward set has not been rolled forward far enough to be consistent with the database, the undo phase cannot occur.

如果前滚集前滚得不够远，无法与数据库一致，则不会出现撤消阶段。

youdao