Introducing RavenDB: The Database for Modern Data Persistence

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

D. MiličićIntroducing RavenDBhttps://doi.org/10.1007/978-1-4842-8919-8_6

6. MapReduce Indexes

Dejan Miličić¹  

(1)

Novi Sad, Serbia

 

The previous chapter demonstrated complete control over an index’s definition and life cycle. Map and MultiMap indexes were introduced, along with various ways to compute fields that can be used to filter and sort documents. This chapter will show how to perform grouping and aggregation in RavenDB. Concepts of MapReduce and MultiMapReduce indexes will be introduced, along with a way to materialize the content of the index into a new collection.

Grouping

Queries executed in the previous chapter were about filtering. The filtering ...