In a non-relational database environment, when tasked with handling a data model primarily composed of complex hierarchical structures with multiple one-to-many relationships and the need for flexible schema changes, which database is the BEST fit?
Graph databases
Wide-column stores
Document databases
Key/value stores
The correct answer is Document databases because they are well-suited for handling hierarchical data structures due to their document-oriented nature, where each document can contain nested information that represents such one-to-many relationships. They also offer schema flexibility, allowing for easy adjustments and evolution of the data structure as requirements change. Graph databases are excellent for relationship traversal but do not inherently offer the same hierarchical document storage model. Wide-column stores can handle large amounts of data with some flexibility, but they are not optimized for deeply nested hierarchical data. Key/value stores are highly performant for simple data models but lack the necessary querying capabilities to efficiently manage complex hierarchies with frequent schema changes.
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