Highly reliable

ClickHouse has been managing petabytes of data serving a number of highload mass audience services of Yandex, Russia's leading search provider and one of the largest European IT companies. Since 2012, ClickHouse has been providing robust database management for the company's web analytics service, comparison e-commerce platform, public email service, online advertising platform, business intelligence tools and infrastructure monitoring.

ClickHouse can be configured as a purely distributed system located on independent nodes, without any single points of failure.

Software and hardware failures or misconfigurations do not result in loss of data. Instead of deleting "broken" data, ClickHouse saves it or asks you what to do before a startup. All data is checksummed before every read or write to disk or network. It is virtually impossible to delete data by accident as there are safeguards even for human errors.

ClickHouse offers flexible limits on query complexity and resource usage, which can be fine-tuned with settings. It is possible to simultaneously serve both a number of high priority low-latency requests and some long-running queries with a background priority.