ClickHouse
ClickHouse Performance Observability: 9 Proven Signals We Trust in 26.9
ClickHouse performance observability on ClickHouse 26.9: nine system tables and endpoints, tested SQL, and a real Code 241 incident traced to one function.
system.query_log
ClickHouse
ClickHouse Cloud Cost: How Expensive Queries Become a Very Large Bill, Measured and Fixed
ChistaDATA · ClickHouse Cloud cost engineering · October 2026 ClickHouse Cloud cost is not set by how much data you store. It is set by how your queries are written and how often they run. […]
ClickHouse
ClickHouse Query Execution Explained: 4 Proven Stages From INSERT to Distributed JOIN
ChistaDATA · ClickHouse query execution, stage by stage · September 2026 ClickHouse query execution has no magic in it. A statement is parsed and planned, parts are scanned in parallel, partial results are merged, and […]
ClickHouse
Advanced ClickHouse Troubleshooting on 26.8 LTS: 9 Proven Techniques for Slow Queries, Stuck Merges and Memory Errors
The ClickHouse troubleshooting method ChistaDATA uses on 26.8 LTS and 26.9: nine techniques, the system tables behind each, the queries we run, and one disk-full incident from our own lab.
ChistaDATA Performance
ClickHouse Performance Audit: 8 Best Tips for 26.8 LTS
ClickHouse performance audit tips for 26.8 LTS with real lab output: rank query shapes in system.query_log, measure cold past the query condition cache, read EXPLAIN ANALYZE and EXPLAIN WHATIF, and audit codecs per block.
ChistaDATA University
ClickHouse Troubleshooting Techniques: 8 Proven Drills We Teach
The ClickHouse troubleshooting techniques taught in CHT-400 at ChistaDATA University: a scope, prove, fix method and the diagnostic queries for eight production incidents, from too many parts to distributed timeouts.
ClickHouse Performance
ClickHouse Performance Troubleshooting: 9 Proven Techniques for 26.7
ClickHouse performance troubleshooting is mostly a reading problem, not a tooling problem. A 26.7 server already writes down almost everything you need — every query it ran, every byte it touched, every microsecond each operator […]
ClickHouse
ClickHouse p95/p99 Latency Regression Analysis: A Data SRE Playbook
A Data SRE playbook for ClickHouse latency analysis: baseline p95/p99 per query shape, detect regressions in query_log, and fix root causes.
ClickHouse
Diagnosing Slow ClickHouse Queries with system.query_log: A Production Methodology
Master ClickHouse slow query troubleshooting with a production-proven system.query_log methodology to find, classify, and fix query latency fast.