Multiple choice technology databases

A segment has 3 occurrences for a parent. This segment is called a

  1. multiple

  2. twin

  3. sibling

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In IMS, a twin is another occurrence of the same segment type under a single parent. If a parent has 3 occurrences of segment X, those 3 occurrences are twins of each other. 'Multiple' is not the standard IMS terminology for this concept, and 'sibling' refers to different segment types under the same parent, not multiple occurrences of the same type.

AI explanation

In a hierarchical (IMS/DL-I) database, when a single parent segment has multiple occurrences of the same child segment type, those repeated child occurrences are called 'twins' — they share the same segment type and parent but represent different instances of data. Terms like 'multiple' or 'sibling' aren't the standard hierarchical database terminology for this relationship.

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