Your startup is building a prototype that has an evolving schema. Your data will be eventually consistent. Your application is hosted in AWS. Which databse do you choose?

To index a field that holds an array value in MongoDB, which index type do you create?To index a field that holds an array value in MongoDB, which index type do you create?

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What is the recommended size for Redis keys?What is the recommended size for Redis keys?

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Polyglot storage means using multiple types of what in the same application?Polyglot storage means using multiple types of what in the same application?

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