Amazon DynamoDB Concepts: Difference between revisions
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=Nested Attributes= | |||
DynamoDB supports nested attributes up 32 levels deep. | |||
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Revision as of 21:15, 24 April 2019
External
Internal
Overview
Amazon DynamoDB is a managed NoSQL database service.
Table
A table is a collection of items. A table contains zero or more items. An item is a group of attributes that is uniquely identifiable among all other items. Items are similar in many ways to rows, records or tuples in other database systems. There is no limit to the number of items that can be stored in a table.
Other than the primary key, tables do not have schemas, which means that neither the attributes nor their data types need to be defined beforehand.
Item
An item is a collection of attributes. Each item can have its own distinct attributes.
Primary Key
DynamoDB uses primary keys to uniquely identify each item in a table.
Attribute
An attribute is a fundamental data element, something that does not need to be broken down any further.
Attribute Types
Scalar
Number
String
Nested Attributes
DynamoDB supports nested attributes up 32 levels deep.