masterUsername

The master user name for the DB instance. If you specify the `SourceDBInstanceIdentifier` or `DBSnapshotIdentifier` property, don't specify this property. The value is inherited from the source DB instance or snapshot. When migrating a self-managed Db2 database, we recommend that you use the same master username as your self-managed Db2 instance name. Amazon Aurora Not applicable. The name for the master user is managed by the DB cluster. RDS for Db2 Constraints: + Must be 1 to 16 letters or numbers. + First character must be a letter. + Can't be a reserved word for the chosen database engine. RDS for MariaDB Constraints: + Must be 1 to 16 letters or numbers. + Can't be a reserved word for the chosen database engine. RDS for Microsoft SQL Server Constraints: + Must be 1 to 128 letters or numbers. + First character must be a letter. + Can't be a reserved word for the chosen database engine. RDS for MySQL Constraints: + Must be 1 to 16 letters or numbers. + First character must be a letter. + Can't be a reserved word for the chosen database engine. RDS for Oracle Constraints: + Must be 1 to 30 letters or numbers. + First character must be a letter. + Can't be a reserved word for the chosen database engine. RDS for PostgreSQL Constraints: + Must be 1 to 63 letters or numbers. + First character must be a letter. + Can't be a reserved word for the chosen database engine.