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I want to insert bulk data into a MongoDB. Later on I want to find exactly the bulk I inserted.

In MySQL I would have done:

 SELECT * FROM data WHERE id >= start_id AND id <= end_id

How can I fix this in MongoDB?

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If you know start _id and end _id then you can retrieve the bulk you inserted using query like this:

db.yourCollection.find({_id:{$gt:ObjectId("56e13d5aed63a8477a7e2e78"), $lt: ObjectId("570f5a27b2d1a50996d3a0f0")}})

Replace the default mongodb ObjectIds with your _id fields.

Also, if the _id you are using is default mongodb ObjectId then you can easily compare them using above query since mongodb ObjectIds are monotonically increasing.

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