Aggregation Pipelines have a limit of:

A. 2 MB document and 100 MB RAM

B. 16 MB document and 100 MB RAM

C. No limit on document and 100 MB RAM

D. 2 MB document and no limit on RAM

What is the maximum size of a MongoDB document?

A. 2 MB

B. 12 MB

C. There is no maximum size. It depends on the RAM.

D. 16 MB

What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden.

The set also has an arbiter?

A. None of the above

B. 5

C. 3

D. 4

Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

A. db.population.aggregate( [{ $group: { _id: { state: "$state", city; "$city" },pop: { $sum: 1 > > >] )

B. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $pop: 1 } } }] )

C. db.population.aggregate( [{ $group: { _id: { state: Estate", city: n$city" },pop: { $sum: "$pop" } } }] )

D. db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB

Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find ({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});

A. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" : v u "flipar" }

B. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u "flipar" }

C. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u "flipar"}

D. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >

Which of the following is true about aggregation framework?

A. Each aggregation operator need to return atleast one of more documents as a result

B. the aggregate command operates on a multiple collection

C. A single aggregation framework operator can be used more than once in a query

D. Pipeline expressions are stateless except accumulator expressions used with $group operator

What tool would you use if you want to save a gif file in mongo?

A. mongofile

The MongoDB explain() method does not support which of the following verbosity mode:

A. executionStats

B. queryPlanner

C. customExecutionStats

D. allPlansExecution

Consider the following documents:

You perform the following query;

How many documents will be updated by the query?

A. 0

B. 1

C. 2

D. 3

E. 5

The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:

A. oplog.rs

B. ..oplog.rs

C. .oplog.rs

D. local.oplog.rs