Day 41: Monitoring ClickHouse® Performance Metrics

Short summary

ClickHouse provides built-in system tables (system.processes, system.query_log, system.metrics, system.parts, system.replicas) to monitor query performance, memory usage, storage, and replication health. The tutorial covers querying each table for actionable insights, integration with Prometheus/Grafana for dashboards and alerting, and best practices including query logging, insert batching, replication monitoring, and alerts for CPU/memory/disk thresholds.

• •Use ClickHouse system tables to query active queries, completed query history, current metrics, disk usage, and replication status
• •Integrate with Prometheus/Grafana for real-time monitoring dashboards and OpenTelemetry for distributed tracing
• •Enable query logging, batch inserts to avoid small parts, monitor replication lag, and configure alerts for high memory, low disk space, and replication delays

Generated with AI, which can make mistakes.