Articles by ChistaDATA Inc.

About ChistaDATA Inc.

We are an full-stack ClickHouse infrastructure operations Consulting, Support and Managed Services provider with core expertise in performance, scalability and data SRE. Based out of California, Our consulting and support engineering team operates out of San Francisco, Vancouver, London, Germany, Russia, Ukraine, Australia, Singapore and India to deliver 24*7 enterprise-class consultative support and managed services. We operate very closely with some of the largest and planet-scale internet properties like PayPal, Garmin, Honda cars IoT project, Viacom, National Geographic, Nike, Morgan Stanley, American Express Travel, VISA, Netflix, PRADA, Blue Dart, Carlsberg, Sony, Unilever etc

Aggregate Functions via ClickHouse

ChistaDATA Inc.

Introduction Functions that arrive at the resultant value by calculating on a set of values are called aggregation functions. In ClickHouse, aggregate functions work in the normal way as expected by database expert. In this […]

ClickHouse June 2022 Release – v22.6

ChistaDATA Inc.

Introduction This article will introduce the new features defined in the new version of ClickHouse, version 22.6. For more information please visit official ClickHouse docs here. Download the ClickHouse 22.6 release here. ClickHouse Release 22.6 […]

Demystifying JSON Data With ClickHouse

ChistaDATA Inc.

Introduction JSON refers to Javascript Object Notation. It is a popular text data format used to exchange data on modern web and mobile applications. It is based on a subset of the Javascript programming language. […]

How to implement Bloom Filters in ClickHouse for Query Performance

ChistaDATA Inc.

Introduction A Bloom filter is a data structure that tells the user whether a particular item is part of a set. Although it cannot definitively tell if an item is in the set, it can […]

ClickHouse May 2022 Release – v22.5

ChistaDATA Inc.

Introduction This article will introduce the new features defined in the new version of ClickHouse, version 22.5. You can reach to the new ClickHouse release here. Key features & improvements ClickHouse has added new features […]

Reflections from PerconaLive 2022 Austin, TX

ChistaDATA Inc.

As a long-term Perconalive veteran, the most recent Perconalive was more than an Open Source Database conference. It meant to be reunited with thought leaders of open source databases; it meant to be there, learn […]

Swiss PGDay 2022

ChistaDATA Inc.

The Swiss conference on PostgreSQL Swiss PGDay 2022 Friday, July 1, 2022 OST Eastern Switzerland University of Applied Sciences, Campus Rapperswil (Switzerland) Covid-19: No pandemic-related restrictions are expected on the Rapperswil campus. Nevertheless, we appeal […]

How to Recover ClickHouse After ZooKeeper Metadata is Corrupted?

ClickHouse Troubleshooting: How to Restore/Recover ClickHouse after ZooKeeper Metadata is Corrupted/Lost

ChistaDATA Inc.

Introduction When you are building a highly available ClickHouse Infrastrstucture for scale and performance we use ZooKeeper for ClickHouse Replication Management and Operations with ReplicatedMergeTree table engine. You can expect ZooKeeper to face data loss […]

Backup & Data Restore (DR) in ClickHouse: Part 1

ChistaDATA Inc.

Introduction We at ChistaDATA never recommend Replication Solution as an alternative for Backup or DR. Replication focuses on business continuity, i.e. delivering uninterrupted data infrastructure availability to mission-critical ClickHouse Operations and Backup involves creating a […]

Advantages of Column Stores for Real-time Analytics

ChistaDATA Inc.

Introduction In this blog post, I’m going to take on the subject of why we need ColumnStores for Analytics, the options we have, and how ClickHouse is compelling. Background and History Historically popular datastores have […]