Slow queries logging in ScyllaDB

ScyllaDB's Slow Query Logging is a valuable tool for identifying and addressing performance issues related to slow query responses by capturing execution details, allowing for a deeper understanding of query bottlenecks. The feature enables users to trace not only the problematic query but also its intermediate timing traces, offering insights into why a query might be slow. Configuring the Slow Query Logging involves setting parameters like time-to-live (TTL) and a threshold for query duration, all managed via a REST API. The article demonstrates a practical scenario with a cluster set up on AWS, highlighting how changing the consistency level can resolve latency issues, and discusses the performance impact of enabling this feature, noting that it incurs a CPU usage penalty, especially under high load conditions. Despite its potential impact on throughput, the tool is useful for environments where the system's load is manageable, providing essential visibility into query execution without significantly affecting latency.

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