In an era of frequent data leaks, enhancing database and web application security is crucial, and Couchbase 5.0 introduces role-based access control (RBAC) to bolster this effort. Developers familiar with relational databases like MySQL and Oracle can now apply fine-grained access control to NoSQL databases by defining specific privileges for various roles on clusters and buckets within Couchbase. The process involves creating user accounts with unique combinations of roles such as Data Reader or Query Select, which dictate the tasks a user can perform. The Couchbase Shell (CBQ) allows users to interact with the database via a command line interface, highlighting the importance of granting only necessary permissions to minimize security risks. When building applications, developers must ensure that the Couchbase SDKs authenticate with RBAC credentials to establish a connection. This approach to access control reduces the likelihood of unauthorized data access and enhances the overall security of NoSQL database environments.