Question 64

Hierarchical databases are designed to have one parent for each record, with optional nodes forming subtrees.

Hierarchical databases organize data in a tree-like structure where each record has a single parent, allowing for a clear representation of relationships. This structure is suitable for scenarios where data follows a strict hierarchy.

A) Flat-file

Flat-file databases store data in a single table or file without relationships between records. This format does not support the hierarchical relationship where each record has a parent, making it unsuitable for the requirement outlined in the question.

B) Hierarchical

Hierarchical databases are specifically designed to have a single parent record for each entry, which aligns perfectly with the requirement of having one parent for each record and the ability to form subtrees. This option directly meets the criteria set forth in the question.

C) NoSQL

NoSQL databases encompass a variety of database models, including key-value, document, and graph databases. While some NoSQL databases can model hierarchical data, they do not inherently enforce a strict parent-child relationship as required in this context, making this option less appropriate.

D) Cloud

Cloud refers to a computing model that allows for storage and access of data over the internet. It does not specify a type of database structure, such as hierarchical or flat-file, and thus does not address the need for a specific parent-child relationship in data storage.

Conclusion

The hierarchical database structure is the only option that satisfies the requirement of having one parent for each record with optional nodes forming subtrees. Other options fail to meet this specific need, either by lacking a defined parent-child relationship or by not being relevant to database structure. Therefore, the hierarchical model is definitively the correct choice.