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AWS DynamoDB Interview Questions and Answers

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Ques 6. How does DynamoDB achieve scalability and high availability?

DynamoDB achieves scalability and high availability through partitioning, replication, and automatic sharding of data across multiple servers.

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Ques 7. What is the significance of the 'Consistent Read' option in DynamoDB?

Consistent Read ensures that a read operation returns the most up-to-date data reflecting all writes that are acknowledged before the read.

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Ques 8. Explain the concept of Global Secondary Index (GSI) in DynamoDB.

A Global Secondary Index allows querying a table based on alternate keys in addition to the primary key. It provides more flexibility in querying data.

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Ques 9. What is the difference between On-Demand and Provisioned Throughput in DynamoDB?

On-Demand Throughput allows you to pay per request without capacity planning, while Provisioned Throughput requires capacity planning and offers cost savings for consistent workloads.

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Ques 10. Explain the best practices for designing tables in DynamoDB.

Best practices include choosing the right primary key, using appropriate read and write capacities, avoiding hot keys, and utilizing secondary indexes judiciously.

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