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Question 8: Class Extension
If the parent class is “Server” and the child class is “Linux Server,” how are the attributes handled?
- A. Linux Server only has its own unique attributes and does not have the attributes of the Server class.
- B. Linux Server inherits all attributes of the Server class and can also add its own unique attributes.
- C. Attributes must be manually copied to be shared.
- D. Attributes of the Server class are deleted in the Linux Server class.
【Correct Answer】 B. Linux Server inherits all attributes of the Server class and can also add its own unique attributes.
【Detailed Explanation】
ServiceNow’s CMDB adopts a database structure that utilizes object-oriented “parent-child” relationships.
- Inheritance Mechanism: All attributes (fields) defined in a parent class (e.g., Server) are automatically inherited by all child classes (e.g., Linux Server, Windows Server). For example, if “CPU Count” or “Memory Capacity” is an attribute in the Server class, these can be utilized in the Linux Server class as well.
- Extension (Adding Unique Attributes): In addition to the common attributes inherited from the parent, child classes can have their own “unique attributes” to manage specific information for that class. For example, you can add dedicated fields such as “Kernel Version” or “Distribution Name” only to the Linux Server class.
- Benefits: By defining a common data structure once, data consistency is maintained, and performing aggregations—such as calculating the “total memory of all servers”—becomes much easier during reporting.
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