Redis OSS's logical databases provide a simplified approach to managing Redis instances, but they may become insufficient when functional and operational needs change. Four signs indicate that a single Redis instance is no longer sufficient: throughput-intensive use cases, O(n) Redis commands, centralized microservices' databases failing at once due to a bug, and unique configuration requirements. Dedicated instances can address these issues by allowing for better performance, resilience, scaling, and monitoring of each database without compromising on shared configurations or data consistency. Migrating logical indexes to dedicated databases requires manual effort, but automation tools are available to simplify the process. Redis technical teams offer assistance with planning migrations.