Couchbase Server 4.5.1 introduces significant improvements in N1QL, focusing on enhancing functionality, usability, and performance to facilitate the transition from traditional relational databases to a NoSQL/JSON data model. Key updates include the introduction of the SUFFIXES() function, which optimizes LIKE queries with leading wildcards by generating an array of suffix substrings, significantly improving search performance, particularly in applications with search boxes. Additionally, enhancements in N1QL's UPDATE syntax allow for more efficient navigation and updating of nested arrays in JSON documents, supporting complex data structures common in enterprise applications. These advancements, alongside the use of Array Indexing and other performance features, illustrate Couchbase's commitment to delivering sophisticated and efficient database solutions.