How does DynamoDB sort key work?
The sort key of an item is also known as its range attribute. The term range attribute derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value. Each primary key attribute must be a scalar (meaning that it can hold only a single value).
Is sort key required DynamoDB?
Each item in a DynamoDB table requires that you create a primary key for the table, as described in the DynamoDB documentation. A primary key can be a partition key or a combination of a partition key and sort key. The primary key must be unique across the table.
Can sort keys be empty?
You can’t insert an item with Range Key as empty value or without the Range key. When you add an item, the primary key attribute(s) are the only required attributes. String and Binary type attributes must have lengths greater than zero. Set type attributes cannot be empty.
How does query work in DynamoDB?
In a Query operation, DynamoDB retrieves the items in sorted order, and then processes the items using KeyConditionExpression and any FilterExpression that might be present. Only then are the Query results sent back to the client. A Query operation always returns a result set.
Is DynamoDB compatible with MySQL?
Instead of the relational model, NoSQL databases (like DynamoDB) use alternate models for data management, such as key-value pairs or document storage. The SQL examples in this section are compatible with the MySQL RDBMS.
Is DynamoDB better than MySQL?
In short, if you have mainly Lookup queries (and not Join queries), DynamoDB (and other NoSQL DB) is better. If you need to handle a lot of data, you will be limited when using MySQL (and other RDBMS).
Is DynamoDB key value?
Amazon DynamoDB is a key-value and document database that delivers single-digit millisecond performance at any scale. It’s a fully managed, multi-region, multi-active, durable database with built-in security, backup and restore, and in-memory caching for internet-scale applications.
What is Aurora DB based on?