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Remediation

Right-Size Overutilized Instances​

Key considerations​

  • Ensure that the new instance class supports your workload and storage requirements.
  • Review database performance metrics, slow queries, connection patterns, and disk I/O before resizing.
  • Coordinate with application owners before resizing to avoid unexpected availability or performance issues.
  • Prefer applying changes during a maintenance window for production workloads to minimize downtime.

Scale the DB instance​

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