AWS Technical Essentials Practice

Which of the following is a concept of DynamoDB?

1. Secondary Key

2. Tertiary Key

3. Primary Key

4. Index Key

The correct answer is: Primary Key

DynamoDB is a fully managed NoSQL database service provided by AWS, and it uses the concept of a primary key to uniquely identify each item in a table. The primary key can be either a single attribute, known as a partition key, or it can consist of two attributes, known as a composite key, which includes both a partition key and a sort key. The primary key serves as a way to ensure the uniqueness of items stored in the database and helps in efficiently distributing data across partitions for scalability and performance. When designing a DynamoDB table, clearly defining the primary key is crucial, as it directly impacts data access patterns and the overall design of the application. While secondary keys, or secondary indexes, allow for querying the data using attributes that are not part of the primary key, these concepts are expansions of the primary key mechanism. The other choices like tertiary key and index key are not standard concepts defined within the DynamoDB framework, making the primary key the most foundational and critical aspect of DynamoDB's data model.