preferredMaintenanceWindow

The weekly time range during which system maintenance can occur, which might result in an outage. Changing this parameter doesn't result in an outage, except in the following situation, and the change is asynchronously applied as soon as possible. If there are pending actions that cause a reboot, and the maintenance window is changed to include the current time, then changing this parameter causes a reboot of the DB instance. If you change this window to the current time, there must be at least 30 minutes between the current time and end of the window to ensure pending changes are applied.

For more information, see Amazon RDS Maintenance Window in the Amazon RDS User Guide.

Default: Uses existing setting

Constraints:

• Must be in the format ddd:hh24:mi-ddd:hh24:mi.

• The day values must be mon | tue | wed | thu | fri | sat | sun.

• Must be in Universal Coordinated Time (UTC).

• Must not conflict with the preferred backup window.

• Must be at least 30 minutes.