This message was deleted.

Druid doesn't have indexes as explicit objects like traditional RDBMSs do. Instead it stores data organized by time first, then secondarily by a method of your choosing. Following that, data is stored in columnar format with dictionary coding and compression used based on datatype. There is some good reading material on this. I suggest you check out the following: Basic segment partitioning info: https://druid.apache.org/docs/latest/ingestion/partitioning.html#time-chunk-partitioning Imply Youtube channel 3-part series on seconary partitioning: Apache Druid Basics and ingestion (free) online courses: https://learn.imply.io/page/learn-apache-druid