Flashcards

Amazon DynamoDB

fully managed NoSQL database

Amazon DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability.

5 minutes 5 Questions

Concepts covered: Partitioning and Data Distribution, Streams and Triggers, DynamoDB Accelerator (DAX), Transactions, Monitoring and Metrics, Global and Local Secondary Indexes, Read Consistency, Provisioned and On-Demand Capacity, Backup and Restore, Conditional Expressions

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AWS Certified Solutions Architect - Amazon DynamoDB Example Questions

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Question 1

What is the purpose of a scan operation in DynamoDB?

To read a specific item in a DynamoDB table. To insert a new item into a DynamoDB table. To update a specific item in a DynamoDB table. To read all items in a DynamoDB table.

Correct Answer: To read all items in a DynamoDB table.

A scan operation in DynamoDB is used to read all items in a table. It can be useful for performing a full-table scan or querying for items that don't have an index. However, it is generally not recommended for large tables or frequent use due to the amount of data read and the corresponding throughput usage.

Question 2

Which AWS service can you use to trigger a Lambda function when a new record is added to a DynamoDB table?

DynamoDB Streams SNS Kinesis Data Streams SQS

Correct Answer: DynamoDB Streams

DynamoDB Streams is a feature that captures a time-ordered sequence of item-level modifications in a DynamoDB table and stores this information in a log for up to 24 hours. You can use this stream to trigger a Lambda function and take a custom action in response to the update.

Question 3

What is the difference between a partition key and a sort key in DynamoDB?

A partition key is used to partition the data across multiple nodes, while a sort key is used to sort the data within a partition. A partition key is used to determine the shard key for a specific partition, while a sort key is used to determine the amount of throughput allocated to a specific record. A partition key is used to determine the amount of throughput allocated to a specific record, while a sort key is used to determine the shard key for a specific partition. A partition key is used to sort the data within a partition, while a sort key is used to partition the data across multiple nodes.

Correct Answer: A partition key is used to partition the data across multiple nodes, while a sort key is used to sort the data within a partition.

Both partition key and sort key are used to organize data in DynamoDB. The partition key is used to distribute data across multiple nodes, while the sort key is used to sort the data within a partition. The combination of partition key and sort key is used to uniquely identify an item in DynamoDB.

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