I see below statement at When to use CouchDB over MongoDB and vice versa
For accumulating, occasionally changing data, on which pre-defined
queries are to be run. Places where versioning is important.
I am not sure what predefined queries means here ?
Answer
It was referred to the view definition in CouchDB. The pre-defined queries are defined as map/reduced views that are indexed by CouchDB.
These views are defined in design documents stored in the database (pre-defined)
By the time of the post you refer, it is based in the features of CouchDB 1.x, now in CouchDB 2.x you can use Mango Queries for dynamic query expressions.
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