What do sensors in self-driving vehicles, social media activities, and autonomous stock/crypto trading algorithms have in common? These applications are based on data that measures how things change over time. It’s called time-series data, and […]
When performing tests, you may need to generate a large amount of test data for your tables to understand ClickHouse performance under pressure. The generateRandom() method in ClickHouse allows you to easily create and populate […]
This article explains how to define SQL users and roles and then apply privileges and permissions to databases, tables, rows, and columns. CREATE, DROP, ALTER operations cannot be performed for the following objects, even if […]
Introduction Business requirements change over time, and the database design may alter as well. You might not be able to afford to remove a table and rebuild it from scratch. The ALTER statement allows you […]
Introduction Since databases are where data is stored in systems, they are among the most valuable and secure parts of the system. The results of the studies show that database security is not given much […]
Introduction Data is a collection of information that can be used for many different purposes, including big-volume data analysis, external data integration, and many more in ClickHouse. Broadly, engines play a key role in these […]
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 […]
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