A query is slow while CPU is free or one query takes all CPU
Tune ClickHouse query parallelism to improve performance and balance CPU usage under high concurrency.
November 2, 202612 min read
Tag: query performance
Posts tagged "query performance"
Debugging Query Performance with Per-Second Metrics
Debug query performance with per-second metrics to identify memory spikes, disk I/O, cache misses, CPU bottlenecks, JOIN issues, and query spills.
August 18, 202614 min read
ClickHouse® Query Profiling: Identifying Bottlenecks
Profile queries in ClickHouse® to identify CPU, memory, I/O, and network bottlenecks for faster query performance. (
July 4, 20267 min read
A Guide to ClickHouse® Dictionaries
Learn how ClickHouse® Dictionaries enable ultra-fast lookups, reduces JOIN overhead, and improve query performance with practical examples.
June 13, 202612 min read
ClickHouse® Data Types: Explained for Beginners
Explore ClickHouse® data types with real-world examples and learn how to choose the right types for efficient storage and faster queries.
June 9, 202611 min read
When Should High-Cardinality Columns Come First in ClickHouse® ORDER BY?
Learn when high-cardinality columns improve ClickHouse® ORDER BY performance and how to choose correctly.
February 19, 20264 min read
Date Partitioning Strategies for High-Performance ClickHouse® Queries
ClickHouse® date partitioning strategies to improve query performance, enable partition pruning, and efficiently manage large time-based data.
February 11, 20267 min read