ClickHouse Archives | ChistaDATA Inc.

Designing ClickHouse for Mixed Workloads

Designing ClickHouse for Mixed Workloads: Separating OLTP-Style Inserts from Heavy OLAP Queries in ClickHouse In today’s data-driven landscape, organizations increasingly need databases that can handle both transactional and analytical workloads efficiently. ClickHouse, primarily known as […]

Designing ClickHouse Schemas for 1B+ Row Tables

ChistaDATA Inc.

Designing ClickHouse Schemas for 1B+ Row Tables: Mastering Engines, Primary Keys, and Partitioning for Real-Time Analytics When dealing with billion-row datasets in real-time analytics, schema design becomes the cornerstone of performance. ClickHouse, with its columnar […]

Avoiding Costly Mistakes: Profile Events and Query Traces in a Single ClickHouse Query

ChistaDATA Inc.

Effortlessly Profile Events and Query Traces in a Single ClickHouse Query ClickHouse’s exceptional performance in analytical workloads comes with the challenge of understanding and optimizing complex query execution patterns. When queries don’t perform as expected, […]

When ClickHouse Queries Get “Stuck”

ChistaDATA Inc.

When ClickHouse Queries Get “Stuck”: Detecting, Analyzing, and Safely Killing Problematic Sessions ClickHouse is a high-performance columnar database management system designed for online analytical processing (OLAP). While it excels at handling large-scale data analytics workloads, […]

SQL Antipatterns in ClickHouse

ChistaDATA Inc.

Analyzing Common SQL Antipatterns in ClickHouse and Best Practices for High Performance ClickHouse is renowned for its ability to process trillions of rows in milliseconds, making it a powerhouse for real-time analytics. However, this performance […]

When Not to Use ClickHouse

ChistaDATA Inc.

When Not to Use ClickHouse: Understanding the Limits of a Powerful Analytics Engine ClickHouse has emerged as a powerhouse in the world of analytics databases, renowned for its blistering speed in processing large-scale analytical queries. […]

MergeTree Settings: Tuning for Insert Performance vs Query Speed

ChistaDATA Inc.

In ClickHouse, the MergeTree engine family is the cornerstone of high-performance data storage and querying. However, achieving optimal performance requires careful tuning of merge-related settings. The key challenge lies in balancing insert performance against query […]

Monitoring Merge Queues in ClickHouse

Shiv Iyer

Monitoring Merge Queues in ClickHouse: Detecting and Resolving Merge Pressure ClickHouse, renowned for its high-performance columnar storage and analytical query capabilities, relies heavily on its underlying Log-Structured Merge-Tree (LSM-Tree) architecture to achieve exceptional write throughput […]

Using system.query_thread_log for Low-Level ClickHouse Performance Insights

ChistaDATA Inc.

Using system.query_thread_log in ClickHouse for Low-Level Performance Insights Introduction to Thread-Level Query Analysis In the realm of high-performance analytical databases, ClickHouse stands out for its ability to process massive datasets at lightning speed. However, as […]

Setting Up ClickHouse Alerts: Detecting Performance Degradation Before It Impacts Users

ChistaDATA Inc.

Setting Up ClickHouse Alerts: Detecting Performance Degradation Before It Impacts Users ClickHouse is a powerful column-oriented database management system designed for real-time analytical processing, capable of handling massive datasets with exceptional speed. However, like any […]