Skip to main content

Remediation

Right-Size Underutilized RDS Instances​

Key Considerations​

  • Review CPU, read IOPS, write IOPS, connection count, and workload seasonality before changing the instance class.
  • Ensure that the new instance class supports your workload and storage requirements.
  • Coordinate with application owners before resizing to avoid unexpected performance issues.
  • Prefer applying changes during a maintenance window for production workloads.

Modify the DB Instance Class​

From AWS CLI​

To apply during the next maintenance window (recommended for production):

aws rds modify-db-instance \
    --db-instance-identifier {{db-instance-id}} \
    --db-instance-class {{new-instance-class}} \
    --apply-immediately false

To apply immediately (causes a brief outage while resizing):

aws rds modify-db-instance \
    --db-instance-identifier {{db-instance-id}} \
    --db-instance-class {{new-instance-class}} \
    --apply-immediately true