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| [Open Targets](https://www.opentargets.org/) | Genome Research | Genome Search | [Twitter, October 2021](https://twitter.com/OpenTargets/status/1452570865342758913?s=20), [Blog](https://...
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d4ad5e84-f387-4954-8bcb-dd4e9a0b4771
| [OpenReplay](https://openreplay.com/) | Product Analytics | Session Replay | [Docs](https://docs.openreplay.com/en/deployment/openreplay-admin/) ...
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619b2f6e-56f1-4ec2-b519-09214d82f8fc
| [OpsVerse](https://opsverse.io/) | Observability | — | [Twitter, 2022](https://twitter.com/OpsVerse/status/1584548242100219904) ...
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94d06a0a-b04c-4764-aaea-456c97cc7851
| [Oxide](https://oxide.computer/) | Hardware & Software | Server Control Plane | [GitHub Repository](https://github.com/oxidecomputer/omicron) ...
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42b9d88c-6946-41e2-90bd-38ee0339ede2
| [PRANA](https://prana-system.com/en/) | Industrial predictive analytics | Main product | [News (russian), Feb 2021](https://habr.com/en/news/t/541392/) ...
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| [Papermark](https://www.papermark.io/) | Software & Technology | Document Sharing & Analytics | [Twitter, September 2023](https://twitter.com/mfts0/status/1698670144367567263) ...
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dc028d21-3409-47bf-8f79-a9de5cca5b31
| [Percona](https://www.percona.com/) | Performance analysis | Percona Monitoring and Management | [Official website, Mar 2020](https://www.percona.com/blog/2020/03/30/advanced-query-analysis-in-percona-m...
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9651ed0e-2851-4540-803c-1c169b07a1e5
| [Physics Wallah](https://www.pw.live/) | Education Technology | Real-Time Analytics | [Gurgaon Meetup talk, March 2025](https://clickhouse.com/videos/gurgaon-meetup-clickhouse-at-physics-wall...
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73dc677d-3422-4656-9145-20400f3d3d0f
| [Piwik PRO](https://piwik.pro/) | Web Analytics | — | [Official website, Dec 2018](https://piwik.pro/blog/piwik-pro-clickhouse-faster-efficient-reports/) ...
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ab6e2ba5-f379-462c-b5b0-ae12fecd113a
| [PoeticMetric](https://www.poeticmetric.com/) | Metrics | Main Product | Community Slack, April 2022 ...
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81698954-0478-4d57-a675-a5878736e2f4
| [PostHog](https://posthog.com/) | Product Analytics | Main Product | [Release Notes, October 2020](https://posthog.com/blog/the-posthog-array-1-15-0), [Blog, November 2021](h...
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590b172f-7cdb-436b-9ad6-31ca9baa611e
| [Prefect](https://www.prefect.io/) | Software & Technology | Main Product | [Blog, May 2024](https://clickhouse.com/blog/prefect-event-driven-workflow-orchestration-powered-by-click...
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92d2cec0-235d-4b32-8d65-3bbe1db6bc34
| [QINGCLOUD](https://www.qingcloud.com/) | Cloud services | Main product | [Slides in Chinese, October 2018](https://github.com/ClickHouse/clickhouse-presentations/blob/master/meet...
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9a5bd5bc-e87b-4cb1-9f14-19460136c956
| [Qube Research & Technologies](https://www.qube-rt.com/) | FinTech | Analysis | ClickHouse Cloud user ...
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7767f8f7-b514-43a7-a338-b95fe0b241b3
| [RELEX](https://relexsolutions.com) | Supply Chain Planning | Forecasting | [Meetup Video, December 2022](https://www.youtube.com/watch?v=wyOSMR8l-DI&list=PL0Z2YDlm0b3iNDUzpY1S3L_iV...
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d20d8b1b-005a-44ba-b060-0bc54b6b770e
| [Rambler](https://rambler.ru) | Internet services | Analytics | [Talk in Russian, April 2018](https://medium.com/@ramblertop/разработка-api-clickhouse-для-рамблер-топ-10...
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d5cc8986-ed1a-45be-a4e8-3d8df0ab21c5
| [Real Estate Analytics](https://rea-global.com/) | Software & Technology | Real-time Analytics | [Singapore meetup, February 2025](https://clickhouse.com/videos/singapore-meetup-real-estate-analytics-cl...
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ddbc9b6b-c3f1-4fd7-aed3-8cb1ebaf1a3d
| [Request Metrics](https://requestmetrics.com/) | Software & Technology | Observability | [Hacker News, May 2023](https://news.ycombinator.com/item?id=35982281) ...
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69efa4e2-524b-4ef5-bccf-f2b8df190954
| [Retell](https://retell.cc/) | Speech synthesis | Analytics | [Blog Article, August 2020](https://vc.ru/services/153732-kak-sozdat-audiostati-na-vashem-sayte-i-zachem-...
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| [Rokt](https://www.rokt.com/) | Software & Technology | eCommerce | [Meetup Video, December 2022](https://www.youtube.com/watch?v=BEP07Edor-0&list=PL0Z2YDlm0b3iNDUzpY1S3L_iV...
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| [RuSIEM](https://rusiem.com/en) | SIEM | Main Product | [Official Website](https://rusiem.com/en/products/architecture) ...
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| [SEMrush](https://www.semrush.com/) | Marketing | Main product | [Slides in Russian, August 2018](https://github.com/ClickHouse/clickhouse-presentations/blob/master/meetu...
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bc51cfcd-8732-4567-899c-33fe1cee45b1
| [SMI2](https://smi2.ru/) | News | Analytics | [Blog Post in Russian, November 2017](https://habr.com/ru/company/smi2/blog/314558/) ...
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48951ca2-63c7-4624-9b00-f7aa0f2655f2
| [Santiment](https://www.santiment.net) | Behavioral analytics for the crypto market | Main Product | [Github repo](https://github.com/santiment/sanbase2) ...
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666067f0-13b4-4a4c-81d1-0934cc951ad7
| [Scarf](https://about.scarf.sh/) | Open source analytics | Main product | [Meetup, December 2024](https://github.com/ClickHouse/clickhouse-presentations/blob/master/2024-meetup-sa...
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| [ScratchDB](https://scratchdb.com/) | Software & Technology | Serverless Analytics | [GitHub](https://github.com/scratchdata/ScratchDB) ...
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| [Sendinblue](https://www.sendinblue.com/) | Software & Technology | Segmentation | [Blog, February 2023](https://engineering.sendinblue.com/segmentation-to-target-the-right-audience/) ...
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| [seo.do](https://seo.do/) | Analytics | Main product | [Slides in English, November 2019](https://github.com/ClickHouse/clickhouse-presentations/blob/master/mee...
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| [ServiceNow](https://www.servicenow.com/) | Managed Services | Qualitative Mobile Analytics | [Meetup Video, January 2023](https://www.youtube.com/watch?v=b4Pmpx3iRK4&list=PL0Z2YDlm0b3iNDUzpY1S3L_iV4...
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| [SigNoz](https://signoz.io/) | Observability Platform | Main Product | [Source code](https://github.com/SigNoz/signoz) , [Bangalore Meetup, February 2025](https://clickhouse.co...
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| [Sipfront](https://www.sipfront.com/) | Software Development | Analytics | [Twitter, October 2021](https://twitter.com/andreasgranig/status/1446404332337913895?s=20) ...
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| [slido](https://www.slido.com/) | Software & Technology | Q&A and Polling | [Meetup, April 2023](https://www.linkedin.com/events/datameetup-3-spotlightondataeng7048914766324473856/a...
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| [Spark New Zealand](https://www.spark.co.nz/) | Telecommunications | Security Operations | [Blog Post, Feb 2020](https://blog.n0p.me/2020/02/2020-02-05-dnsmonster/) ...
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| [Splio](https://splio.com/en/) | Software & Technology | Individuation Marketing | [Slack, September 2023](https://clickhousedb.slack.com/archives/C04N3AU38DV/p1693995069023669) ...
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| [Spotify](https://www.spotify.com) | Music | Experimentation | [Slides, July 2018](https://www.slideshare.net/glebus/using-clickhouse-for-experimentation-104247173) ...
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| [Statsig](https://statsig.com/) | Software & Technology | Real-time analytics | [Video](https://clickhouse.com/videos/statsig) ...
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| [Superology](https://superology.com/) | Software & Technology | Customer Analytics | [Blog Post, June 2022](https://clickhouse.com/blog/collecting-semi-structured-data-from-kafka-topics-usin...
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| [Swetrix](https://swetrix.com) | Analytics | Main Product | [Source code](https://github.com/swetrix/swetrix-api) ...
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| [Synpse](https://synpse.net/) | Application Management | Main Product | [Twitter, January 2022](https://twitter.com/KRusenas/status/1483571168363880455) ...
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| [Talo Game Services](https://trytalo.com) | Gaming Analytics | Event-based player analytics | [Blog, August 2024](https://trytalo.com/blog/events-clickhouse-migration) ...
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| [TeamApt](https://www.teamapt.com/) | FinTech | Data Processing | [Official Website](https://www.teamapt.com/) ...
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| [Temporal](https://www.tencentmusic.com/) | Infrastructure software | Observability product | [Bellevue Meetup, August 2024](https://github.com/user-attachments/files/17135746/Temporal.Supercharged.O...
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| [Tencent](https://www.tencent.com) | Messaging | Logging | [Talk in Chinese, November 2019](https://youtu.be/T-iVQRuw-QY?t=5050) ...
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| [The Guild](https://the-guild.dev/) | API Platform | Monitoring | [Blog Post, November 2022](https://clickhouse.com/blog/100x-faster-graphql-hive-migration-from-elasticsea...
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| [Timeflow](https://timeflow.systems) | Software | Analytics | [Blog](https://timeflow.systems/why-we-moved-from-druid-to-clickhouse/ ) ...
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| [TrackingPlan](https://www.trackingplan.com/) | Marketing & Sales | Monitoring | ClickHouse Cloud user ...
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| [Trip.com](https://trip.com/) | Travel Services | Logging | [Meetup, March 2023](https://github.com/ClickHouse/clickhouse-presentations/blob/master/meetup71/Trip.com...
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| [Twilio](https://www.twilio.com) | Customer engagement | Twilio SendGrid | [Meetup presentation, September 2024](https://github.com/user-attachments/files/17135790/twilio-sendgrid-...
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| [UTMSTAT](https://hello.utmstat.com/) | Analytics | Main product | [Blog post, June 2020](https://vc.ru/tribuna/133956-striming-dannyh-iz-servisa-skvoznoy-analitiki-v-click...
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| [UseTech](https://usetech.com/) | Software Development | — | [Job Posting, December 2021](https://vk.com/wall136266658_2418) ...
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| [VKontech](https://vkontech.com/) | Distributed Systems | Migrating from MongoDB | [Blog, January 2022](https://vkontech.com/migrating-your-reporting-queries-from-a-general-purpose-db-mong...
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| [Vantage](https://www.vantage.sh/) | Software & Technology | Cloud Cost Management | [Meetup, April 2023](https://www.youtube.com/watch?v=gBgXcHM_ldc) , [ClickHouse Blog, June 2023](https://...
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| [Vexo](https://www.vexo.co/) | App development | Analytics | [Twitter, December 2023](https://twitter.com/FalcoAgustin/status/1737161334213546279) ...
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| [Visiology](https://visiology.com/) | Business intelligence | Analytics | [Company website](https://visiology.com/) ...
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| [W3 Analytics](https://w3analytics.hottoshotto.com/) | Blockchain | Dashboards for NFT analytics | [Community Slack, July 2023](https://clickhousedb.slack.com/archives/CU170QE9H/p1689907164648339) ...
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| [Walmart Labs](https://www.walmartlabs.com/) | Internet, Retail | — | [Talk in English, July 2020](https://youtu.be/GMiXCMFDMow?t=144) ...
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| [WebGazer](https://www.webgazer.io/) | Uptime Monitoring | Main Product | Community Slack, April 2022 ...
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| [Wildberries](https://www.wildberries.ru/) | E-commerce | | [Official website](https://it.wildberries.ru/) ...
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| [Wowza](https://www.wowza.com/) | Video Platform | Streaming Analytics | ClickHouse Cloud user ...
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| [Xenoss](https://xenoss.io/) | Martech, Adtech development | — | [Official website](https://xenoss.io/big-data-solution-development) ...
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| [YTsaurus](https://ytsaurus.tech/) | Distributed Storage and Processing | Main product | [Main website](https://ytsaurus.tech/) ...
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| [Yandex Market](https://market.yandex.ru/) | e-Commerce | Metrics, Logging | [Talk in Russian, January 2019](https://youtu.be/_l1qP0DyBcA?t=478) ...
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| [Yotascale](https://www.yotascale.com/) | Cloud | Data pipeline | [LinkedIn (Accomplishments)](https://www.linkedin.com/in/adilsaleem/) ...
{"source_file": "adopters.md"}
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| [Zappi](https://www.zappi.io/web/) | Software & Technology | Market Research | [Twitter Post, June 2024](https://x.com/HermanLangner/status/1805870318218580004)) ...
{"source_file": "adopters.md"}
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| [Zipy](https://www.zipy.ai/) | Software & Technology | User session debug | [Blog, April 2023](https://www.zipy.ai/blog/deep-dive-into-clickhouse) ...
{"source_file": "adopters.md"}
[ -0.031064383685588837, 0.03514479100704193, -0.03382602334022522, 0.04698989912867546, 0.025386445224285126, -0.0903935432434082, -0.0117197185754776, 0.0017071443144232035, -0.0718267634510994, 0.025352241471409798, 0.019382216036319733, 0.027068939059972763, -0.024650439620018005, 0.0592...
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| [Zoox](https://zoox.com/) | Software & Technology | Observability | [Job listing](https://www.linkedin.com/jobs/view/senior-software-engineer-observability-at-zoox-413940024...
{"source_file": "adopters.md"}
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| [МКБ](https://mkb.ru/) | Bank | Web-system monitoring | [Slides in Russian, September 2019](https://github.com/ClickHouse/clickhouse-presentations/blob/master/me...
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| [ЦФТ](https://cft.ru/) | Banking, Financial products, Payments | — | [Meetup in Russian, April 2020](https://team.cft.ru/events/162) ...
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title: 'Getting started with chDB' sidebar_label: 'Getting started' slug: /chdb/getting-started description: 'chDB is an in-process SQL OLAP Engine powered by ClickHouse' keywords: ['chdb', 'embedded', 'clickhouse-lite', 'in-process', 'in process'] doc_type: 'guide' Getting started with chDB In this guide, we're ...
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We can also count the number of rows in that file: python chdb.query( """ SELECT count() FROM s3( 's3://clickhouse-public-datasets/youtube/original/files/' || 'youtubedislikes_20211127161229_18654868.1637897329_vid.json.zst', 'JSONLines' )""" ) text 336432 This file contains just over 300,000 ...
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We can then use the DESCRIBE clause to inspect the schema: python sess.query(f""" DESCRIBE youtube.dislikes SETTINGS describe_compact_output=1 """ ) text "id","String" "fetch_date","String" "upload_date","String" "title","String" "uploader_id","String" "uploader","String" "uploader_sub_count","Int64" "is...
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2efb1c89-65fa-40ef-8095-d56fac5473ee
We can then query that DataFrame from chDB: python chdb.query( """ SELECT uploader, likeDislikeRatio FROM Python(df) """, output_format="DataFrame" ) text uploader likeDislikeRatio 0 Jeremih 21.473548 1 TheKillersMusic ...
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title: 'chDB' sidebar_label: 'Overview' slug: /chdb description: 'chDB is an in-process SQL OLAP Engine powered by ClickHouse' keywords: ['chdb', 'embedded', 'clickhouse-lite', 'in-process', 'in process'] doc_type: 'guide' import Image from '@theme/IdealImage'; import dfBench from '@site/static/images/chdb/df_bench...
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description: 'Prerequisites and setup instructions for ClickHouse development' sidebar_label: 'Prerequisites' sidebar_position: 5 slug: /development/developer-instruction title: 'Developer Prerequisites' doc_type: 'guide' Prerequisites ClickHouse can be build on Linux, FreeBSD and macOS. If you use Windows, you c...
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469ebf2a-9858-4bff-a68e-dcd5ca3896ba
```bash Permission denied (publickey). fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists. ``` the SSH keys for connecting to GitHub are missing. These keys are normally located in ~/.ssh . For SSH keys to be accepted you need to upload them ...
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Testing will commence as soon as ClickHouse employees label your PR with a tag "can be tested". The results of some first checks (e.g. code style) will come in within several minutes. Build check results will arrive within half an hour. The main set of tests will report itself within an hour. The system will prepare ...
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CREATE TABLE test.hits ( WatchID UInt64, JavaEnable UInt8, Title String, GoodEvent Int16, EventTime DateTime, EventDate Date, CounterID UInt32, ClientIP UInt32, ClientIP6 FixedString(16), RegionID UInt32, UserID UInt64, CounterClass Int8, OS UInt8, UserAgent UInt8, URL String, Referer String, URLDomain ...
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Array(String), ParsedParams.Key2 Array(String), ParsedParams.Key3 Array(String), ParsedParams.Key4 Array(String), ParsedParams.Key5 Array(String), ParsedParams.ValueDouble Array(Float64), IslandID FixedString(16), RequestNum UInt32, RequestTry UInt8) ENGINE = MergeTree PARTITION BY toYYYYMM(EventDate)...
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bb2ac31f-d793-4830-ae1f-bda6755afc0f
CREATE TABLE test.visits ( CounterID UInt32, StartDate Date, Sign Int8, IsNew UInt8, VisitID UInt64, UserID UInt64, StartTime DateTime, Duration UInt32, UTCStartTime DateTime, PageViews Int32, Hits Int32, IsBounce UInt8, Referer String, StartURL String, RefererDomain String, StartURLDomain String, EndUR...
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fe4214b3-e6df-4c65-895c-f17e6eadd637
TraficSource.ID Array(Int8), TraficSource.SearchEngineID Array(UInt16), TraficSource.AdvEngineID Array(UInt8), TraficSource.PlaceID Array(UInt16), TraficSource.SocialSourceNetworkID Array(UInt8), TraficSource.Domain Array(String), TraficSource.SearchPhrase Array(String), TraficSource.SocialSourcePa...
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cb253492-c043-4288-9e57-e55015cda52b
``` Import the data: bash clickhouse-client --max_insert_block_size 100000 --query "INSERT INTO test.hits FORMAT TSV" < hits_v1.tsv clickhouse-client --max_insert_block_size 100000 --query "INSERT INTO test.visits FORMAT TSV" < visits_v1.tsv
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b448b70d-a936-4891-a360-dd267255417d
description: 'A comprehensive overview of ClickHouse architecture and its column-oriented design' sidebar_label: 'Architecture Overview' sidebar_position: 50 slug: /development/architecture title: 'Architecture Overview' doc_type: 'reference' Architecture Overview ClickHouse is a true column-oriented DBMS. Data...
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5ff2247a-43d0-4688-8b75-b13347af655e
Various IColumn implementations ( ColumnUInt8 , ColumnString , and so on) are responsible for the memory layout of columns. The memory layout is usually a contiguous array. For the integer type of columns, it is just one contiguous array, like std :: vector . For String and Array columns, it is two vectors: one...
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IDataType and IColumn are only loosely related to each other. Different data types can be represented in memory by the same IColumn implementations. For example, DataTypeUInt32 and DataTypeDateTime are both represented by ColumnUInt32 or ColumnConstUInt32 . In addition, the same data type can be represented...
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ReadBuffer and WriteBuffer are just a contiguous buffer and a cursor pointing to the position in that buffer. Implementations may own or not own the memory for the buffer. There is a virtual method to fill the buffer with the following data (for ReadBuffer ) or to flush the buffer somewhere (for WriteBuffer ). The...
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But there are notable exceptions: The AST query is passed to the read method, and the table engine can use it to derive index usage and to read fewer data from a table. Sometimes the table engine can process data itself to a specific stage. For example, StorageDistributed can send a query to remote servers, a...
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InterpreterSelectQuery uses ExpressionAnalyzer and ExpressionActions machinery for query analysis and transformations. This is where most rule-based query optimizations are performed. ExpressionAnalyzer is quite messy and should be rewritten: various query transformations and optimizations should be extracted in...
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Aggregate functions {#aggregate-functions} Aggregate functions are stateful functions. They accumulate passed values into some state and allow you to get results from that state. They are managed with the IAggregateFunction interface. States can be rather simple (the state for AggregateFunctionCount is just a sin...
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3e34ca8f-c29b-4982-906c-c554c7749ce4
:::note For most external applications, we recommend using the HTTP interface because it is simple and easy to use. The TCP protocol is more tightly linked to internal data structures: it uses an internal format for passing blocks of data, and it uses custom framing for compressed data. We haven't released a C library ...
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Server pool is a Poco::ThreadPool class instance defined in Server::main() method. It can have at most max_connection threads. Every thread is dedicated to a single active connection. Global thread pool is GlobalThreadPool singleton class. To allocate thread from it ThreadFromGlobalPool is used. It has an i...
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There are also specialized thread pools for preemptable tasks. Such IExecutableTask task can be split into ordered sequence of jobs, called steps. To schedule these tasks in a manner allowing short tasks to be prioritized over long ones MergeTreeBackgroundExecutor is used. As name suggests it is used for background...
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Each slot can be seen as an independent state machine with the following states: * free : slot is available to be allocated by any query. * granted : slot is allocated by specific query, but not yet acquired by any thread. * acquired : slot is allocated by specific query and acquired by a thread. Note that al...
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Things become more complicated when you have subqueries in IN or JOIN clauses, and each of them uses a Distributed table. We have different strategies for the execution of these queries. There is no global query plan for distributed query execution. Each node has its local query plan for its part of the job. We onl...
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When we are going to read something from a part in MergeTree , we look at primary.idx data and locate ranges that could contain requested data, then look at column.mrk data and calculate offsets for where to start reading those ranges. Because of sparseness, excess data may be read. ClickHouse is not suitable for ...
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Replication is implemented in the ReplicatedMergeTree storage engine. The path in ZooKeeper is specified as a parameter for the storage engine. All tables with the same path in ZooKeeper become replicas of each other: they synchronize their data and maintain consistency. Replicas can be added and removed dynamica...
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:::note The ClickHouse cluster consists of independent shards, and each shard consists of replicas. The cluster is not elastic , so after adding a new shard, data is not rebalanced between shards automatically. Instead, the cluster load is supposed to be adjusted to be uneven. This implementation gives you more contro...
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description: 'Guide for building ClickHouse from source on macOS systems' sidebar_label: 'Build on macOS for macOS' sidebar_position: 15 slug: /development/build-osx title: 'Build on macOS for macOS' keywords: ['MacOS', 'Mac', 'build'] doc_type: 'guide' How to Build ClickHouse on macOS for macOS :::info You don't...
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description: 'Guide for integrating Rust libraries into ClickHouse' sidebar_label: 'Rust Libraries' slug: /development/integrating_rust_libraries title: 'Integrating Rust Libraries' doc_type: 'guide' Rust Libraries Rust library integration will be described based on BLAKE3 hash-function integration. The first s...
{"source_file": "integrating_rust_libraries.md"}
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It is worth noting that the #[no_mangle] attribute and extern "C" are mandatory for all such methods. Without them, it will not be possible to perform a correct C/C++-compatible compilation. Moreover, they are necessary for the next step of the integration. After writing the code for the shim methods, we need to ...
{"source_file": "integrating_rust_libraries.md"}
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description: 'Guide to testing ClickHouse and running the test suite' sidebar_label: 'Testing' sidebar_position: 40 slug: /development/tests title: 'Testing ClickHouse' doc_type: 'guide' Testing ClickHouse Functional tests {#functional-tests} Functional tests are the most simple and convenient to use. Most of C...
{"source_file": "tests.md"}
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