The text discusses the benefits and implementation of Cost-Based Optimization (CBO) in database management, particularly within Couchbase's systems. Unlike the static Rule-Based Optimization (RBO) that follows fixed rules, CBO uses metadata and statistics to dynamically select the most resource-efficient query-execution plans, akin to how navigation apps like Google Maps choose optimal routes by considering real-time factors. Couchbase introduced its CBO for JSON in Couchbase Server 6.5, touting it as a more agile and automated approach to optimizing database workloads. This method reduces query latency and simplifies the developer's task by automatically determining the most efficient query path, enhancing the existing RBO through improved index and JOIN type selection and processing order. Couchbase's CBO is positioned as a patent-pending technology that significantly improves query efficiency and resource utilization.