MongoDB Objects - Data Modeling for MongoDB - page 54

you'd do if you were looking for information in a topic without an index: you'd start at
page one and read through the whole thing. In general, you want to avoid making the server
do table scans because they is very slow for large collections.

SUBTYPE

Subtyping groups the common attributes and relationships of entities, while retaining what
is special within each entity. Subtyping is an excellent way of communicating that certain
concepts are very similar and of showing examples.

In our publishing data model, an Author may write many PrintVersions and many
eBooks :

• Each Author may write one or many PrintVersions .

• Each PrintVersion must be written by one Author .