Maintenance of a Standalone DB System

Oracle starts maintenance of a standalone DB system (with or without HeatWave cluster enabled) within two hours of the Maintenance window start time that you define for the DB system.

The maintenance of the DB system involves a short period of downtime. To reduce the downtime, use high availability DB systems. See High Availability.

The maintenance of a standalone DB system involves the following steps:

1. New resources are launched using the latest operating system and MySQL server.
2. Data is synchronized between the old and new systems. During this time, existing connections are allowed to complete, but no new connections are allowed.
3. If the DB system has a HeatWave cluster attached to it, the data in the HeatWave cluster is automatically recovered or reloaded. See HeatWave Cluster Data Recovery.
4. The endpoints are attached to the new resources and new connections are allowed.
   Note
   
   If any errors occur during the maintenance, the process stops, and rolls back to the old DB system, and connections resume.