Top 10 AWS DynamoDB Interview Questions: Ace Your Next Interview!

I can provide you with the top 10 AWS DynamoDB interview questions and answers. Here they are:

  1. Q: What is DynamoDB?
    A: DynamoDB is a fully managed NoSQL database service provided by AWS. It offers high scalability, low latency, and automatic scaling of throughput capacity.

  2. Q: What are the key features of DynamoDB?
    A: DynamoDB offers features like automatic scaling, high availability, durability, low latency, global replication, and flexible data modeling.

  3. Q: What is the primary key in DynamoDB?
    A: The primary key in DynamoDB is used to uniquely identify each item in a table. It can be either a simple primary key (partition key) or a composite primary key (partition key + sort key).

  4. Q: What is the difference between provisioned throughput and on-demand capacity in DynamoDB?
    A: Provisioned throughput requires you to specify the read and write capacity units in advance, while on-demand capacity allows you to pay for the actual read and write requests made to the table.

  5. Q: How does DynamoDB handle scaling and partitioning?
    A: DynamoDB automatically partitions data across multiple servers to handle scalability. It uses partition keys to distribute data and workload evenly across partitions.

  6. Q: What is the difference between a query and a scan operation in DynamoDB? A: A query operation allows you to retrieve items based on the values of the primary key attributes, while a scan operation scans the entire table and applies filter conditions to fetch the desired items.

  7. Q: What is DynamoDB Streams?
    A: DynamoDB Streams is a feature that captures a time-ordered sequence of item-level modifications in a table. It enables real-time data processing and can be used for use cases like change capture and data analysis.

  8. Q: Can you explain the DynamoDB capacity modes?
    A: DynamoDB offers two capacity modes: provisioned and on-demand. Provisioned capacity requires you to specify the read and write capacity units, while on-demand capacity automatically scales to handle the workload.

  9. Q: How can you improve the performance of DynamoDB?
    A: Performance in DynamoDB can be improved by using appropriate partition keys, designing efficient data models, leveraging secondary indexes, and optimizing queries.

  10. Q: What is the difference between DynamoDB and RDS?
    A: DynamoDB is a NoSQL database service designed for fast and predictable performance at any scale, while RDS is a managed relational database service that supports various database engines like MySQL, PostgreSQL, and Oracle.

These questions cover some of the essential aspects of DynamoDB and should help you in your interview preparation. Remember to provide detailed and relevant answers based on your experience with the service.

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