MongoDB: embed the data you read together
Choose document boundaries from access patterns, growth, and update behavior rather than translating relational tables one-for-one.
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Your first MongoDB aggregation pipeline
Filter paid orders, group revenue by customer, and sort the result using a small dataset you can inspect by hand.
Design DynamoDB keys from the questions you need to ask
Start with one application's reads and writes, then choose partition and sort keys that make those operations direct.
Choose an Azure Cosmos DB partition key you can live with
Think about query routing, data growth, and hot workloads before making a foundational modeling decision.