ClickHouse
ClickHouse is an open-source column-oriented database management system designed for online analytical processing (OLAP). It enables real-time analytical queries on large datasets with high performance, leveraging vectorized query execution and data compression. It is optimized for read-heavy workloads, such as business intelligence, log analysis, and time-series data processing.
Developers should learn ClickHouse when building applications that require fast analytical queries on massive datasets, such as real-time dashboards, ad-hoc reporting, or monitoring systems. It is particularly useful in scenarios like e-commerce analytics, IoT data analysis, and log aggregation, where low-latency queries on billions of rows are essential for decision-making.