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mondrian
Mondrian is an Online Analytical Processing (OLAP) server that enables business users to analyze large quantities of data in real-time.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
eMondrian is a free open-source OLAP server. It is based on the Mondrian project. OLAP server allows you to represent your database as a multidimensional space with dimensions and measures. It hides the complexity of underlying tables and their relations and allows you to interactively analyze data from multiple perspectives. eMondrian server can run on Windows and Linux operating systems.
The most efficient way is to use column store databases as data sources for eMondrian. For example, ClickHouse could run as a powerful and fast query engine while eMondrian works as a proxy representing data as cubes and executing MDX queries.