避免配置错误非常重要，没有任何方法来撤销数据上的错误。
It is critical to avoid configuration mistakes, as there is no way to undo data issues.
请注意针对后者的错误处理程序可撤销前者所做的工作，以使数据不会处在一种不一致的状态。
Notice that the error handler for the latter undoes the work of the former so that data is not left in an inconsistent state.
从旧表中删除敏感列，并保留那些列中的数据，以便用于审计或者确保可以执行撤销。
Deleting the sensitive columns from the old table and preserving the data from those columns for audit purposes or to ensure the ability to do an undo.
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