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在这个步骤中一定要按电子书中说的做备份。
Make sure you make a backup at this stage, as the ebook instructs.
youdao
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这样就减少了在生产数据库上做备份的开销。
This offloads the overhead of taking a backup on the production database.
youdao
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我喜欢做备份；这多次挽救了我的工作。
I like backups; they have saved my work many, many times.
youdao