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Amazon Relational Database Service (RDS)

Amazon RDS is a managed Relational Database engine in the cloud. The database engines to choose from include :

Amazon Aurora
Oracle
Microsoft SQL Server
PostgreSQL
MySQL
MariaDB

Amazon RDS handles routine database tasks such as provisioning, patching, backup, recovery, failure detection, and repair.


High Availability using the Multi-AZ Deployment Option

If you choose to run RDS with the Multi-AZ Deployment Option, it can failover automatically in case of disaster.

You can also choose to replicate it to another region.

Backups
Amazon RDS backups are automatically turned on by default and enables point in time recovery of the database instance. The database and transaction logs are backed up and stored for a user-specified retention period. This allows restoration of the database instance to any second during the retention period, up to the last five minutes. The automatic backup retention period can be configured to up to thirty-five days.

 Database Snapshots

 Database snapshots are user-initiated backups of the database instance. It is stored in Amazon S3. The database snapshots are kept until it is explicitly deleted. You can create a new instance from a database snapshot whenever you desire. Although database snapshots serve operationally as full backups, you are billed only for incremental storage use.

 Read Replicas

 Read Replicas are available in RDS for MySQL, PostgreSQL, and Amazon Aurora. Read replicas provide enhanced performance and durability for database instances.

 The read replicas operates as a DB Instance which allows read-only access. This feature allows the scaling out beyond the constraints of a single DB instance. For heavy workloads, applications which require to read lots of data can read from multiple copies of the database thereby increasing aggregate read throughput.
More information about Amazon RDS can be found in this link :

 https://aws.amazon.com/rds/details/#ha
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