How to split a row into different collections with each store the _id of the first collection as reference?

The driver is actually responsible for generating the ObjectId value, so it's fairly straightforward (below I assume your database is stored in the python variable 'db').

The driver is actually responsible for generating the ObjectId value, so it's fairly straightforward (below I assume your database is stored in the python variable 'db'): import bson myrow = { att1 : "att1", att2 : "att2", att3 : "att3", att4 : "att4"} ref_id = bson.ObjectId() db.collectionA. Insert({att1:myrow'att1', att2:myrow'att2', _id:ref_id}) db.collectionB. Insert({att3:myrow'att3', att4:myrow'att4', ref_id:ref_id}).

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