roll forwards

• Restore and roll forward for table space level does not require an offline
  表空间级的恢复和前滚不要求脱机操作
• Restoring a log backup rolls forward all pages in the roll forward set
  还原日志备份将对前滚集中的所有页进行前滚。
• This allows roll forward to continue with the next statement in the sequence
  从而使前滚按顺序在下一条语句中继续进行。
• Redo phase roll forward
  重做阶段（前滚）
• For an introduction to the redo phase , during which roll forward occurs , see
  有关在其中执行前滚的重做阶段的介绍，请参阅
• Lost of archived redo logs preventing a roll forward beyond that point
  防止出现超越某一时间点前滚的归档重做日志的丢失。
• To do a roll forward recovery in db2 udb , archive logging must be used
  要在db2 udb中执行前滚恢复，必须使用归档日志记录。
• To start over , restore the desired file and perform the roll forward again
  若要重新开始，请再次还原所需的文件并执行前滚。
• Database restore and roll forward does not necessary require the database be shutdown
  数据库恢复和前滚不一定要求关闭数据库
• No rolling forward allowed
  禁止前滚