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High Availability (HA) and Replication in ClickHouse

Introduction Is 90% availability good? Why is high availability important? What does that mean for a business in plain terms? Let’s dive into them. What is High Availability (HA)? Business critical databases require minimal downtime […]

ClickHouse August 2022 Release – v22.8

ChistaDATA Inc.

Introduction ClickHouse version 22.08 (August 2022) was released on August 18, 2022. This version includes 12 new features, 12 performance improvements, +40 other improvements, and over 45 bug fixes. For more information, please visit the […]

ClickHouse Performance: Comprehensive Guide to SQL Engineering Best Practices

ChistaDATA Inc.

Introduction SQL is the computer language used to communicate with Databases. It is also an important key factor for database performance. If the SQL query is not designed effectively, it can impact performance negatively. In […]

ClickHouse MergeTree: Deletes and Updates with CollapsingMergeTree

ChistaDATA Inc.

Introduction Deletion and updating the records are common on transactional databases. ClickHouse supports deletes and updates in MergeTree table engine via the ALTER TABLE … statement. They are also known as Mutations which happen asynchronously […]

Compression Techniques in Columnar Databases

ChistaDATA Inc.

Introduction The amount of data stored in databases is increasing day by day. This increases the cost required for data storage and network access. Compression techniques are one of the commonly used methods to save […]

IDE (QtCreator) Setup for ClickHouse Development

ChistaDATA Inc.

Pre-requisites QtCreator is one among the IDEs which is recommended by ClickHouse. The below steps were tried out on Mac by myself and on Ubuntu by my colleague. Please note that if you are trying […]

Comparing ClickHouse vs RocksDB for Real-time Analytics

ChistaDATA Inc.

Introduction In this article, we will provide information about ClickHouse and RocksDB. Afterward, we will talk about the comparison, advantages, and disadvantages of these two databases, which are the RDBMS and the Key-Value database system. […]

Building ClickHouse on Windows

ChistaDATA Inc.

Introduction We started working on creating a build for ClickHouse on WSL with the aim of becoming more familiar with ClickHouse. As an organization focusing on ClickHouse optimization at every level, this is obviously a […]

Introduction to ReplacingMergeTree in ClickHouse

ClickHouse MergeTree: Introduction to ReplacingMergeTree

ChistaDATA Inc.

Introduction Multiple heavy-weight table engines and functionalities of ClickHouse are built on top of the MergeTree engine. The MergeTree engine supports PRIMARY KEY expression, but it is not the same as the primary keys in […]

ClickHouse July 2022 Release – v22.7

ChistaDATA Inc.

Introduction ClickHouse version 22.7 (July 2022) was unveiled on 21st July 2022. This release has around 25 new features, 19 performance improvement changes, 40+ other improvements and 50+ bug fixes. Here is the official list […]