Day 17 of #100DaysOfClickHouse: Mastering Data Filtering for Faster ClickHouse Queries
When working with ClickHouse®, writing a query is usually straightforward. Writing an efficient query, however, requires understanding how ClickHouse …
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SELECT FINAL and OPTIMIZE FINAL Are Not the Same Thing
One thing that confused me when I first started learning ClickHouse was the word FINAL . Because eventually you'll come across both: SELECT * FROM eve…
Day 14 of #100DaysOfClickHouse: Understanding Nodes, Shards, and Replicas
When people first start learning ClickHouse®, they usually focus on SQL queries, table engines, and performance optimization. But as data grows from m…
100 Days of ClickHouse® – Day 6: Importing CSV Files into ClickHouse®
CSV files are one of the most common formats for storing and exchanging data. Whether you’re working with logs, analytics data, application exports, o…
How to Analyze ClickHouse Query Plan Contention
We see a lot of dashboards that look great until they drop a single row, then everything freezes. The problem isn't usually missing indexes or bad par…
Three Ways to Set Up CDC from Postgres to ClickHouse
You cannot run analytical queries on the same Postgres primary that serves your application without paying for it in CPU and connections. A read repli…
Replicate MySQL to ClickHouse with Sling
Introduction ClickHouse is a columnar OLAP database. It runs aggregate queries across billions of rows in seconds. MySQL is what most apps run on for …
Why Real-Time Analytics Eventually Changes Your Database Architecture
A lot of systems begin with a single database. Usually PostgreSQL. And honestly, in the beginning, that works perfectly fine. The application stores: …
Four LLM Engines, One ClickHouse Cluster: An Agentic AI Architecture
We are building an agentic AI analytics platform for a crypto exchange where internal teams — Trading Ops, Risk, Compliance, Finance, Treasury, Produc…
ClickHouse JOINs Aren't Slow Anymore (You're Reading 2020's Docs)
ClickHouse JOIN performance was rebuilt between 2022 and 2026. The "avoid JOINs in ClickHouse" advice from 2020 is still circulating: "ClickHouse can'…
Код как документация: как мы строим самодокументируемые витрины данных в Почте Mail
В аналитике больших данных есть старая проблема: код ETL-витрин живет своей жизнью, а документация — своей. Изменяешь логику, забываешь обновить описа…
Код как документация: как мы строим самодокументируемые витрины данных в Почте Mail
В аналитике больших данных есть старая проблема: код ETL-витрин живет своей жизнью, а документация — своей. Изменяешь логику, забываешь обновить описа…
Why PostgreSQL and ClickHouse Work So Well Together
A lot of people compare PostgreSQL and ClickHouse like they are competing databases. They really are not. In fact, modern data systems often use both …