You want to return a list of all elements in two Redis sets. Which keyword do you use?

You need to create a pub/sub server. Which databse do you use?You need to create a pub/sub server. Which databse do you use?

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You need multi-item ACID transactions with snapshot isolation within a partition for your cloud-based application. Which NoSQL databse do you choose?You need multi-item ACID transactions with snapshot isolation within a partition for your cloud-based application. Which NoSQL databse do you choose?

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Which method shows you whether MongoDB uses any indexes when running a query, and how the indexes are used?Which method shows you whether MongoDB uses any indexes when running a query, and how the indexes are used?

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