The article explores the transition from a relational database management system (RDBMS) to a NoSQL document model, highlighting the benefits and strategies for optimizing query performance and index configuration in this modernized approach. It discusses how organizations facing dynamic business requirements can leverage NoSQL databases, such as Couchbase, to enhance their application infrastructure. The text specifically examines the use of an effective index strategy, emphasizing its role in balancing query performance and resource management. Through a practical example involving hotel data, the article illustrates the differences between relational and document models, showing how the denormalized document model simplifies queries by eliminating the need for JOINs and utilizing a single index, thanks to features like Couchbase's FLATTEN_KEYS. This approach not only streamlines queries but also improves performance by reducing the complexity and number of index scans.