Any time after the fix application, you can elect to rollback to the previous virtual system state by simply clicking a button.
在应用补丁之后的任何时间，只需要单击按钮就可以轻松地回滚到先前的虚拟系统状态。
This paper introduce the rollback checkpointing algorithm in the retry-recovery technique. In order to reduce the system overhead, it presents a scheme implementing in the virtual memory.
本文介绍了容错重算恢复技术中的向后滚动检查点算法。并针对减少系统开销的问题，提出了在虚拟存贮器中的一种实现方案。
When you are implementing virtual mode, you will need to track when a new row is needed in the data model and when to rollback the addition of the new row.
在实现虚拟模式时，您需要跟踪数据模型中何时需要新行，以及何时回滚新行的添加操作。
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