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 logretain is set to "recovery" or userexit is set to "Yes" (see below), the active log files will be retained and become online archive log files for use in roll-forward recovery.

如果logretain设置成“Recovery”或者userexit设置成“Yes”(请参阅下一节)，将保留活动日志文件，而且这些文件将变成联机归档日志文件，以便在前滚恢复中使用。

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Old-time Knesset pundits say that dissolution bills, once they begin to roll forward, create a momentum which eventually leads the two big parties to sit down informally and set an agreed date for an early election.

ECONOMIST: Israel