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ClickHouse® is a real-time analytics DBMS
1831aa45d9
CI captures [1] too long logs flush:
$ clickhouse-local --file query_log.tsv.gz --input-format TabSeparatedWithNamesAndTypes -q "select event_time, query from table where Settings['log_comment'] = '01926_order_by_desc_limit.sql' and type = 'QueryFinish' and (lower(query) LIKE lower('SELECT s FROM order_by_desc ORDER BY u%') or query like '%query_log%') format Vertical"
Row 1:
──────
event_time: 2022-11-20 12:46:42
query: SELECT s FROM order_by_desc ORDER BY u DESC LIMIT 10 FORMAT Null
SETTINGS max_memory_usage = '400M';
Row 2:
──────
event_time: 2022-11-20 12:46:47
query: SELECT s FROM order_by_desc ORDER BY u LIMIT 10 FORMAT Null
SETTINGS max_memory_usage = '400M';
Row 3:
──────
event_time: 2022-11-20 12:46:54
query: SELECT read_rows < 110000 FROM system.query_log
WHERE type = 'QueryFinish' AND current_database = currentDatabase()
AND event_time > now() - INTERVAL 10 SECOND
AND lower(query) LIKE lower('SELECT s FROM order_by_desc ORDER BY u%');
[1]: https://s3.amazonaws.com/clickhouse-test-reports/43143/c393af2812cb56a60a99d48c15c0443d2da98a8b/stateless_tests__tsan__[2/5].html
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
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ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time.
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 (Woboq) with syntax highlight and navigation.
- Code Browser (github.dev) with syntax highlight, powered by github.dev.
- Contacts can help to get your questions answered if there are any.
Upcoming events
- v22.11 Release Webinar Original creator, co-founder, and CTO of ClickHouse Alexey Milovidov will walk us through the highlights of the release, provide live demos, and share vision into what is coming in the roadmap.
- ClickHouse Meetup at the Deutsche Bank office in Berlin Hear from Deutsche Bank on why they chose ClickHouse for big sensitive data in a regulated environment. The ClickHouse team will then present how ClickHouse is used for real time financial data analytics, including tick data, trade analytics and risk management.
- AWS re:Invent Core members of the ClickHouse team -- including 2 of our founders -- will be at re:Invent from November 29 to December 3. We are available on the show floor, but are also determining interest in holding an event during the time there.