Here is the English translation of your text:
1. For example, if the machine loses power, then after restarting, the system needs to use online redo logs to restore it to the point of failure. Question: After a power outage, would transactions still be committed? If they cannot be committed, how can the system be restored to the point of failure using ClassCircularityError? Thank you.
2. For example, if the disk fails, archived redo logs and online redo logs are needed to recover the data. If the disk is broken, how can data be recovered? Shouldn't the data be backed up to another machine instead? Communication link failure due to underlying exception:, thank you for answering.
Thank you for providing solutions ——
### Solution Reference:
You may refer to:
How to implement the popup window for the undo and redo buttons in the C# toolbar:
http://www.myexception.cn/c-sharp/63930.html
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