In an Amazon DynamoDB table, the primary key that uniquely identifies each item in the table can be composed of a partition key and a sort key. Well-designed sort keys have two key benefits: They gather related information together in one place where it can be queried efficiently. Careful ...
You can define sort key indexes on non-key attributes, and then use these indexes in Query requests. With local secondary indexes, applications can efficiently retrieve data items across multiple dimensions. For more information, see Local Secondary Indexes in DynamoDB. April 18, 2013 New API ...
DynamoDB does not require a predefined schema and allows adding new attributes on the fly at the application level, but it does require you to identify the attribute names and data types for the table’s primary keys, sort keys, and local secondary indexes. Similar to Cassandra, the pr...
@DynamoDBAutoGeneratedKey– Marks a partition key or sort key property as being autogenerated.DynamoDBMappergenerates a random UUID when saving these attributes. Only String properties can be marked as autogenerated keys. @DynamoDBAttribute– Maps a property to a table attribute. importcom.amazonaw...
Items stored in a DynamoDB table can have a partition key and an optional sort key as part of their primary key. Items in an item collection have the same partition key but different sort keys. A DynamoDB query can target an item collection to retrieve all items in the collection, or ...
Notice how this index is organized. Each attribute name and value is used as the key of the index, and the value is a list of document IDs that include the corresponding attribute name and value. The keys are constructed so that their natural sort order can support range queries efficiently...
Hash and Range Type Primary Key: This type of Primary Key is built upon the hashed key and the range key in the table: a hashed index on the hash primary key attribute, and a range sort index on the range primary key attribute. This type of primary key allows for AWS's rich query ...
Primary Keys Partition Key A unique attribute. Composite Key Partition Key + Sort Key When partition key is not unique. For example: Forum posts, Users post multiple messages. Combination of: User_ID Sort key (timestamp) 2. A Unique Combination ...
writes, and more. To further elaborate, Fauna's indexes can handle multiple sources, sort fields, match fields, and returned values. This differs from DynamoDB where indexes are constructed for a single table and can only match with one attribute, along with the ability to sort on one ...
Querying is a very powerful operation in DynamoDB. It allows you to select multiple Items that have the same partition ("HASH") key but different sort ("RANGE") keys. In this lesson, we'll learn some basics around the Query operation including using Queries to: retrieve all Items with a...