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My database has users collection,
each user has multiple documents,
each document has multiple sections
each section has multiple works
Users work with works collection very often (add new work, update works, delete works). So my question is what structure of collections should I make? works collection is 100-200 records per section.
Should I make work collection for all users with user _id or there is best solution?
Depends on what kind of queries you have. The guideline is to arrange documents so that you can fetch all you need in ideally one query.
On the other hand, what you probably want to avoid is to have mongo reallocate documents because there’s not enough space for a in-place update. You can do that by preallocating enough space, or extracting that frequently changing part into its own collection.