Does changing the master username on an RDS PostgreSQL DB cause a reboot?

Question

I've read the docs here on how to "Reset the Master User Password" for an AWS RDS DB.

When done, you have to click Modify DB Instance which says:

The Status field for your RDS DB instance on the RDS dashboard changes to resetting-master-credentials. When the modification is complete, the Status column changes to Available.

Does anyone know if this causes the DB to reboot? I want to change the password with zero downtime to the DB. The AWS docs are unclear about this.

Answer 1

This does not cause a reboot

The documentation states the following

The password change is asynchronous, and applies as soon as possible. This change ignores the Apply Immediately setting.

This means it will apply in the background, not during a maintenance period or reboot.