What does the totalKeysExamined field returned by the explain method indicate?

Answer(s): B

In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

Answer(s): C

Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

upsert command instead of update command
{update: true, insert: true} as the third parameter of update command
This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query
Specify {upsert : true } as the third parameter of update command

Answer(s): D

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

{ "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" : v u "flipar" }
{ "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u "flipar" }
{ "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u "flipar"}
{ "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >

Answer(s): A,D

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