Difficulty: Advanced
Description
These databases run an engine version that is in RDS Extended Support, or will be within a year. Extended Support is billed per vCPU-hour on top of the instance; upgrading to a supported version avoids it.
Selection Criteria
The RDS instance is currently under RDS Extended Support.
OR the RDS instance is using a database engine version that will enter RDS Extended Support within the next year.
Expected Saving
RDS Extended Support costs $0.12/vCPU/hour (year 1) and $0.24/vCPU/hour (year 2+), on top of standard instance costs.
Example: a db.r6g.xlarge (4 vCPUs) incurs ~$350/month extra in year 1 of Extended Support.
Upgrading to a supported version eliminates this charge entirely.
Operational Impact
Downtime: Major version upgrades require a maintenance window. Duration depends on database size and upgrade complexity.
⚠️ Warning — Application compatibility: Major version upgrades may introduce breaking changes in SQL behavior, deprecated functions, or driver compatibility. Test against the new engine version in a non-production environment before applying to production.
⚠️ Warning — Upgrade path: Some engine versions require intermediate upgrades before reaching the latest supported version. Verify the full supported upgrade path before proceeding.
⚠️ Warning — Pre-upgrade snapshot: AWS takes an automatic snapshot before major upgrades, but ensure a recent manual backup exists as an additional safety net.