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ClickHouse® is a real-time analytics DBMS
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为什么图中显示的数据与结论不符合？因为图中的数据是禁用了自适应索引粒度后得到的，默认情况下索引粒度是自适应的。 https://clickhouse.com/docs/en/optimize/sparse-primary-indexes We mentioned in the beginning of this guide in the "DDL Statement Details", that we disabled adaptive index granularity (in order to simplify the discussions in this guide, as well as make the diagrams and results reproducible). For tables with adaptive index granularity (index granularity is adaptive by default) the size of some granules can be less than 8192 rows depending on the row data sizes. 我们在本指南开头的“DDL 语句详细信息”中提到，我们禁用了自适应索引粒度（为了简化本指南中的讨论，并使图表和结果可重现）。 对于具有自适应索引粒度的表（默认情况下索引粒度是自适应的），某些粒度的大小可以小于 8192 行，具体取决于行数据大小。 https://clickhouse.com/docs/en/whats-new/changelog/2019#experimental-features-1 ClickHouse Release 19.6.3.18, 2019-06-13 Experimental Features：实验性特性 Add setting index_granularity_bytes (adaptive index granularity) for MergeTree* tables family. 为合并树家族的表系列添加设置index_granularity_bytes（自适应索引粒度）。 ClickHouse Release 19.10.1.5, 2019-07-12 Performance Improvement：优化改进 Add the possibility to write the final mark at the end of MergeTree columns. It allows to avoid useless reads for keys that are out of table data range. It is enabled only if adaptive index granularity is in use. 添加在合并树列末尾写入最终标记的可能性。它允许避免对超出表数据范围的键进行无用的读取。仅当使用自适应索引粒度时，才会启用它。 |
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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 (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
- ClickHouse Meetup in Austin - Mar 30 - The first ClickHouse Meetup in Austin is happening soon! Interested in speaking, let us know!
- v23.3 Release Webinar - Mar 30 - 23.3 is rapidly approaching. Original creator, co-founder, and CTO of ClickHouse Alexey Milovidov will walk us through the highlights of the release.
Recent Recordings
- FOSDEM 2023: In the "Fast and Streaming Data" room Alexey gave a talk entitled "Building Analytical Apps With ClickHouse" that looks at the landscape of data tools, an interesting data set, and how you can interact with data quickly. Check out the recording on YouTube.
- Recording available: v23.2 Release Webinar NTILE Window Function support, Partition Key for GROUP By, io_uring, Apache Iceberg support, Dynamic Disks, integrations updates! Watch it now!
- All release webinar recordings: YouTube playlist