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What is Multi-AZ deployment in RDS, and how does it improve database availability? What is the difference between an RDS read replica and a Multi-AZ standby instance, and when should you use each? What is Amazon Aurora, and how does it differ from standard RDS MySQL or PostgreSQL in terms of performance and architecture? How does automated backup and point in time recovery work in RDS, and what recovery options does it provide? How does RDS Proxy help applications manage database connections more efficiently, particularly for serverless architectures using Lambda? How should an organization design a comprehensive database resilience and disaster recovery strategy combining Multi-AZ, read replicas, cross region replication, and automated backups?
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What is Amazon RDS and what benefits does it provide over managing a database server yourself on EC2?

Beginner

Answer

Amazon RDS, or Relational Database Service, is a fully managed service that automates time consuming database administration tasks such as hardware provisioning, database software installation and patching, automated backups, and failure detection and recovery, supporting popular database engines like MySQL, PostgreSQL, and SQL Server, letting you focus on your application and data rather than the operational burden of managing database infrastructure yourself.
aws rds create-db-instance --db-instance-identifier my-database --db-instance-class db.t3.medium --engine postgres --master-username admin --master-user-password MyPassword123 --allocated-storage 20
Real-world example A company migrates its self managed MySQL database running on an EC2 instance to RDS, immediately gaining automated backups and patching without needing to dedicate any engineering time to routine database maintenance tasks.

Common follow-ups: Which database engines does RDS support?;What database administration tasks does RDS not automate that you still need to handle yourself?

EC2 & Compute;AWS Backup & Disaster Recovery
All 7 RDS & Databases questions