Explore ClickHouse Insights on ChistaDATA's Blog

ClickHouse Horizontal Scaling: Implementing Parallel Replicas with Dynamic Shards

Introduction ClickHouse is known for its exceptional performance, scalability, and flexibility. With its ability to handle massive amounts of data and process queries in real-time, ClickHouse is becoming increasingly popular among data analysts, developers, and […]

Using GROUPBY for Groupings, Rolllups and Cubes in ClickHouse

Using GROUPBY for Groupings, Rollups and Cubes in ClickHouse

Shiv Iyer

Introduction Grouping, rollup, and cube are SQL query operations that allow for grouping and aggregation of data based on multiple dimensions or attributes. In ClickHouse, these operations are implemented using the GROUP BY clause, which […]

Comprehensive Guide to ChistaDATA’s ClickHouse Performance Audit

ChistaDATA Inc.

Introduction – ClickHouse Performance Audit ClickHouse is a powerful open source relational database management system that offers high performance, scalability, reliability and data security. As ClickHouse is widely used in various industries, it is important […]

Derived Tables for Query Performance in ClickHouse

Shiv Iyer

Introduction Derived tables are tables that are created on-the-fly as a result of a query. They are temporary tables that exist only for the duration of the query, and are not stored in the database. […]

ClickHouse Permutation by Recursion and Cross Join

Shiv Iyer

Permutation is the process of arranging a set of elements in all possible orders. ClickHouse supports two methods for computing permutations: recursion and cross join. Here’s how each method works, along with real-life data examples […]

ClickHouse April 2023 Release – Version 23.4

ChistaDATA Inc.

Introduction Each new release includes new features, improvements, and numerous bug fixes, and the ChistaDATA team is always on top of the latest releases. On 26th April 2023, ClickHouse version 22.4 (April 2023) was released, […]

ChistaDATA's Anansi Query Profiler for ClickHouse

ChistaDATA Anansi Query Profiler

ChistaDATA Inc.

Introduction Top-n queries extract the top or bottom n rows from a result set. In other words, they identify the best or worst examples, such as the top 10 place in a particular area, the […]

Setup ClickHouse Cluster Replication with Zookeeper

ChistaDATA Inc.

Introduction ClickHouse is a powerful and versatile open-source columnar database management system known for its fast performance and high scalability. If you’re looking to build your own ClickHouse cluster, there are several options available, such […]

ClickHouse March 2023 Release – Version 23.3

ChistaDATA Inc.

Introduction ClickHouse, the open-source, columnar-oriented, distributed SQL database management system, is known for its high-performance analytics and data processing capabilities. With each release, ClickHouse continues to evolve and introduce new features to enhance its functionality […]

Deep Dive into ClickHouse SORT Operation and Index Scan

Shiv Iyer

Introduction In ClickHouse, a SORT operation is used to sort data in a specified order, either ascending or descending. Sorting data can improve query performance when the data is accessed in a sorted order, such […]