In Couchbase, memory management in the Query Service is key to keeping the service efficient and responsive, especially as the service handles an increasing number of queries simultaneously. Without proper memory management, things can go awry — greedy queries can hog memory, and the combined memory usage of multiple concurrent queries can overwhelm the service, leading to degraded performance. 

Fortunately, the Query Service has several features that allow users to manage the memory usage of queries and the overall service.