Amazon RDS (Relational Database Service)

Amazon RDS (Relational Database Service) is an AWS service that runs relational database engines, including MySQL, PostgreSQL, MariaDB, Oracle and SQL Server, as a managed offering. AWS handles provisioning, backups, patching and optional replication, while you manage schemas, queries and access.

Why it matters

Running a database well is hard work: backups, upgrades, replication and recovery all need care. RDS automates much of it. Multi-AZ deployments keep a standby copy in another availability zone and fail over automatically, and read replicas spread read traffic. You do not get operating system access, so some low-level tuning options are restricted.

Example

An application connects through an endpoint hostname, not an IP address:

mysql -h mydb.abc123.us-east-1.rds.amazonaws.com -u app -p

After a failover, the endpoint's DNS record points to the new primary, so a short DNS TTL and a client that reconnects are important.

Common mistakes

Making the instance publicly accessible instead of keeping it in a private subnet.
Treating Multi-AZ as a backup. It protects against hardware or zone failure, not accidental deletes.
Letting automated backups lapse or never testing a restore.
Applications that cache the resolved IP and fail to reconnect after failover.

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