Aurora maintenance windows that the team rehearses.

The team had had three Aurora minor-version upgrades in eighteen months that surprised them — a query plan changed, a parameter default flipped, a connection-pool behaviour shifted. Each was small but disruptive. None had been rehearseable in the production environment.

Aurora Blue/Green Deployments clone the cluster, including data, and let you run the upgrade against the clone first. We instituted quarterly rehearsals: clone production, apply the next planned maintenance, run the synthetic traffic suite against it, document any surprises. Surprises that survived became JIRA tickets to investigate before the real maintenance.

Unplanned incidents from Aurora maintenance dropped to zero post-instituting the rehearsals. The maintenance windows have become routine — the team’s survey on "stress level during DB maintenance" dropped from 7/10 to 2/10. The blue/green clone is a habit now.