Amazon Relational Database Service (Amazon RDS) is a web service that makes it easier to set up, operate, and scale a relational database in the cloud. It provides cost-efficient, resizable capacity for an industry-standard relational database and manages common database administration tasks.

User Guide
Describes all Amazon RDS concepts and provides instructions on using the various features with both the console and the command line interface.
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  API Reference
Describes all the API operations for Amazon RDS in detail. Also provides sample requests, responses, and errors for the supported web services protocols.