- A. To have minimal downtime during upgrades, follow the steps mentioned under [Perform minimal downtime major version upgrade using read replicas](how-to-upgrade.md#perform-minimal-downtime-major-version-upgrade-using-read-replicas). The server is unavailable during the upgrade process, so we recommend you perform this operation during your planned maintenance window. The estimated downtime depends on the database size, storage size provisioned (IOPs provisioned), and the number of tables on the database. The upgrade time is directly proportional to the number of tables on the server. To estimate the downtime for your server environment, we recommend first performing an upgrade on a restored copy of the server.
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