MongoDb agregation vs client side data manipulation -


i need load set of data mongodb. let's assume, need have items list based on condition, need know items children count, need include embedded documents have "moderated = true" , count subdocuments "moderated == false" without including them. since have document embedded document, can retrieve set of data db , manipulate on client side "for". , can use 

db.item.aggregate

to create response data need , response have exact needed structure.

the question better approach in terms of reducing load on mongodb:

  1. aggregation mongodb?
  2. create needed data on client side?

this strange question. really, if care reducing load on mongodb, it's better send data need , computation on client. defeats of purpose of using mongodb. real question is, why prioritizing reducing load on mongodb? presumably aggregation not main load on server , don't want impact core operations aggregation? in case, solution add hidden secondary replica set (you running mongodb in replica set already, right? ;d) , hidden secondary's purpose handle data analytics tasks aggregation. data state on hidden secondary may behind data state on primary, depending on replication lag, that's ok analytics.


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