The name of an Amazon S3 bucket that contains database installation files for your CEV. For example, a valid bucket name is my-custom-installation-files.
The Amazon S3 directory that contains the database installation files for your CEV. For example, a valid bucket name is 123456789012/cev1. If this setting isn't specified, no prefix is assumed.
The name of your CEV. The name format is 19.customized_string . For example, a valid name is 19.my_cev1. This setting is required for RDS Custom for Oracle, but optional for Amazon RDS. The combination of Engine and EngineVersion is unique per customer per Region.
The CEV manifest, which is a JSON document that describes the installation .zip files stored in Amazon S3. Specify the name/value pairs in a file or a quoted string. RDS Custom applies the patches in the order in which they are listed.