be6777bc86
SELECTs are affected by the mutations, since it tries to apply them on fly, and scanning over existing mutations can take significant amount of time (for simple queries, i.e. count()) And also even after mutation had been finished, it still a problem, because mutations are not removed instantly. So instead introduce an atomic counter alter_conversions_mutations, that is incremented for new mutations and decremented once mutation finished/killed, that way once the mutation finished they will not affect queries. Here are some numbers for non-RENAME mutations: rmt vanilla w/o mutations | queries: 3693, QPS: 494.813 rmt vanilla w/ mutations | queries: 2190, QPS: 388.256 rmt patched w/o mutations | queries: 3168, QPS: 620.061 rmt patched w/ mutations | queries: 3155, QPS: 614.424 mt vanilla w/o mutations | queries: 3498, QPS: 656.399 mt vanilla w/ mutations | queries: 3821, QPS: 600.425 mt patched w/o mutations | queries: 5732, QPS: 745.585 mt patched w/ mutations | queries: 4719, QPS: 715.034 Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com> |
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SECURITY.md |
ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time.
How To Install (Linux, macOS, FreeBSD)
curl https://clickhouse.com/ | sh
Useful Links
- Official website has a quick high-level overview of ClickHouse on the main page.
- ClickHouse Cloud ClickHouse as a service, built by the creators and maintainers.
- Tutorial shows how to set up and query a small ClickHouse cluster.
- Documentation provides more in-depth information.
- YouTube channel has a lot of content about ClickHouse in video format.
- Slack and Telegram allow chatting with ClickHouse users in real-time.
- Blog contains various ClickHouse-related articles, as well as announcements and reports about events.
- Code Browser (github.dev) with syntax highlighting, powered by github.dev.
- Contacts can help to get your questions answered if there are any.
Monthly Release & Community Call
Every month we get together with the community (users, contributors, customers, those interested in learning more about ClickHouse) to discuss what is coming in the latest release. If you are interested in sharing what you've built on ClickHouse, let us know.
- v24.3 Community Call - Mar 26
- v24.4 Community Call - Apr 30
Upcoming Events
Keep an eye out for upcoming meetups and events around the world. Somewhere else you want us to be? Please feel free to reach out to tyler <at>
clickhouse <dot>
com. You can also peruse ClickHouse Events for a list of all upcoming trainings, meetups, speaking engagements, etc.
- ClickHouse Meetup in Dubai - May 28
Recent Recordings
- Recent Meetup Videos: Meetup Playlist Whenever possible recordings of the ClickHouse Community Meetups are edited and presented as individual talks. Current featuring "Modern SQL in 2023", "Fast, Concurrent, and Consistent Asynchronous INSERTS in ClickHouse", and "Full-Text Indices: Design and Experiments"
- Recording available: v24.2 Release Call All the features of 24.2, one convenient video! Watch it now!
Interested in joining ClickHouse and making it your full-time job?
We are a globally diverse and distributed team, united behind a common goal of creating industry-leading, real-time analytics. Here, you will have an opportunity to solve some of the most cutting-edge technical challenges and have direct ownership of your work and vision. If you are a contributor by nature, a thinker and a doer - we’ll definitely click!
Check out our current openings here: https://clickhouse.com/company/careers
Can't find what you are looking for, but want to let us know you are interested in joining ClickHouse? Email careers@clickhouse.com!