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When migrating a server, do not lose MySQL data. Is it possible to create a Master-Master?

I am moving to a new server, and thinking about how to store my 2 MySQL data in a database leads to the fact that I lose both sleep and hair. I was thinking about using the Master-Master setting so that I would not lose anything in this process. How viable it is. Any potential errors?

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Why does the old server ever need to know the data written to the new server? For this reason, make the master-slave setting.

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Source: https://habr.com/ru/post/1726996/

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