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Great question! I've run into this before. The key thing to keep in mind is to follow the official documentation closely and test your implementation with edge cases. Happy to elaborate if you need more specifics.
asked 2 months ago
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I have two collections: orders and customers. I want to fetch all orders along with the customer's name and email.
// orders: { _id, customerId, total, status }
// customers: { _id, name, email }I tried $lookup but it's killing performance on large datasets (~2M orders). Should I be using indexes differently, or is there a better aggregation strategy?
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