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Online analytical processing
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=== Open source === *[[Apache Pinot]] is used at LinkedIn, Cisco, Uber, Slack, Stripe, DoorDash, Target, Walmart, Amazon, and Microsoft to deliver scalable real time analytics with low latency.<ref>{{cite news |last= Yegulalp |first=Serdar |date=2015-06-11 |title= LinkedIn fills another SQL-on-Hadoop niche |url=http://www.infoworld.com/article/2934506/olap/linkedins-pinot-fills-another-sql-on-hadoop-niche.html |magazine=InfoWorld |access-date=2016-11-19}}</ref> It can ingest data from offline data sources (such as Hadoop and flat files) as well as online sources (such as Kafka). Pinot is designed to scale horizontally. * [[Mondrian OLAP server]] is an [[open-source software|open-source]] OLAP server written in [[Java (programming language)|Java]]. It supports the [[Multidimensional Expressions|MDX]] query language, the [[XML for Analysis]] and the {{usurped|1=[https://web.archive.org/web/20150312031439/http://www.olap4j.org/ olap4j]}} interface specifications. * Apache Doris is an open-source real-time analytical database based on MPP architecture. It can support both high-concurrency point query scenarios and high-throughput complex analysis.<ref>{{cite web |title=Apache Doris |url=https://github.com/apache/doris |website=Github |publisher=Apache Doris Community |access-date=5 April 2023}}</ref> * [[Apache Druid]] is a popular open-source distributed data store for OLAP queries that is used at scale in production by various organizations. * [[Apache Kylin]] is a distributed data store for OLAP queries originally developed by eBay. * [[Cubes (OLAP server)]] is another lightweight [[open-source software|open-source]] toolkit implementation of OLAP functionality in the [[Python (programming language)|Python programming language]] with built-in ROLAP. * [[ClickHouse]] is a fairly new column-oriented DBMS focusing on fast processing and response times. * [[DuckDB]]<ref>{{Cite web |title=An in-process SQL OLAP database management system |url=https://duckdb.org/ |access-date=2022-12-10 |website=DuckDB |language=en}}</ref> is an in-process SQL OLAP<ref>{{Cite web |last=Anand |first=Chillar |date=2022-11-17 |title=Common Crawl On Laptop - Extracting Subset Of Data |url=https://avilpage.com/2022/11/common-crawl-laptop-extract-subset.html |access-date=2022-12-10 |website=Avil Page |language=en}}</ref> database management system. * [[MonetDB]] is a mature open-source column-oriented SQL RDBMS designed for OLAP queries.
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