AWS Serverless Microservices with Patterns and Best Practices - AWS DynamoDB Primary Key, Partition Key, and Sort Key

The video tutorial explains the concept of primary keys in DynamoDB, focusing on partition keys and composite primary keys. It describes how a primary key uniquely identifies items in a table and the difference between a simple partition key and a composite key, which includes a sort key. The tutorial also covers how DynamoDB uses partition keys for hashing and storage, and the flexibility offered by composite keys for querying data. Examples from e-commerce applications illustrate these concepts.

What is a primary key in DynamoDB?

• A method to sort items in a table

• A type of database

• A unique identifier for each item in a table

• A function to hash data

What determines the partition where an item will be stored in DynamoDB?

• The size of the item

• The value of the partition key

• The number of items in the table

• The type of database

In a table with only a partition key, what must be true about the partition key values?

• They determine the sort order

• They can be the same for multiple items

• They must be unique for each item

• They are optional

What is a composite primary key in DynamoDB?

• A key that consists of a partition key and a sort key

• A key that is used for sorting items

• A key that consists of only a partition key

• A key that is optional in a table

How does a composite primary key provide flexibility in querying data?

• By eliminating the need for a partition key

• By storing items in different databases

• By enabling sorting of items based on the sort key

• By allowing multiple items to have the same partition key