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Mongodb cannot create a unique index by setting dropDups: true?

 May 12, 2019   mongodb, question

The same value already exists in a field in the database. I want to create a unique index for this field and delete the redundant data, so I set dropDups to true when creating the index, but I still report an error and repeat key. What is going on? Or is there any way to quickly delete redundant data?

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