Online Access Free C100DBA Practice Test

What is the use of mongodump and mongorestore tools?

• A.audit mongodb deployment
• B.performance tune mongodb deployment
• C.backup mongodb deployment
• D.replicate mongodb deployments

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( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: "$pop" } } }] )
• B.db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
• C.db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: 1 > > >] )
• D.db.population.aggregate( [{ $group: { _id: { state: "$state", city: "$city" },pop: { $pop: 1 } } }] )

Which of the following aggregation commands in MongoDB does not support sharded collections?

• A.aggregate
• B.All of the above
• C.group
• D.mapReduce

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( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $pop: 1 } } }] )
• B.db.population.aggregate( [{ $group: { _id: { state: Estate", city: n$city" },pop: { $sum: "$pop" } } }] )
• C.db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
• D.db.population.aggregate( [{ $group: { _id: { state: "$state", city; "$city" },pop: { $sum: 1 > > >] )

Which operations add new documents to a collection?

• A.update
• B.insert
• C.Create
• D.delete