Large Nested Document In MongoDb

Question

Imagine you have a collection of items (say A) around 50,000 but every item in it (say a) has a nested collection which can be huge say 20 million items (say B and an item in is refereed to as b). How do you recommend saving this in Mongodb?

A--a-B--b

Should I save it as it like the above And have you huge nested collections or should I flatten out the collections and actually represent the nested collection and at extra attributes on that defines what each item (b) belong to (A)?

Aleksandar Vucetic · Accepted Answer · 2012-02-12 01:29:07Z

4

You cannot have huge nested document, because there is a limit in document size in MongoDB (the link also gives good reasons why this limitation). So your documents inside collection nested inside a have to be into a separate collection and you should relate them somehow with a.

answered Feb 12, 2012 at 1:29

Aleksandar Vucetic

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