Class: Aws::DynamoDBStreams::Types::KeySchemaElement

Inherits:

Struct

Object
Struct
Aws::DynamoDBStreams::Types::KeySchemaElement

show all

Defined in:: gems/aws-sdk-dynamodbstreams/lib/aws-sdk-dynamodbstreams/types.rb

Overview

Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.

A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.

A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.

Constant Summary collapse

SENSITIVE =

[]

Instance Attribute Summary collapse

#attribute_name ⇒ String
The name of a key attribute.
#key_type ⇒ String
The role that this key attribute will assume:.

Instance Attribute Details

#attribute_name ⇒ `String`

The name of a key attribute.

Returns:

(String)

# File 'gems/aws-sdk-dynamodbstreams/lib/aws-sdk-dynamodbstreams/types.rb', line 355

class KeySchemaElement < Struct.new(
  :attribute_name,
  :key_type)
  SENSITIVE = []
  include Aws::Structure
end

#key_type ⇒ `String`

The role that this key attribute will assume:

HASH - partition key
RANGE - sort key

The partition key of an item is also known as its hash attribute. The term "hash attribute" derives from DynamoDB's usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.

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.