Given the following MongoDB URI: mongodb+srv://datascientist34:[email protected]/admin Which of the following statements are true? (select 2)

• A.There are 178 nodes in the xtr replica set.
• B.The password used for authentication is xtr-178
• C.The password used for authentication is ta33w9rd
• D.The user datascientist34 is trying to authenticate on database admin.

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Select all true statements regarding to scaling.

• A.When scaling vertically our scaling cost increases linearly.
• B.Scaling horizontally is generally cheaper than scaling vertically.
• C.When scaling horizontally our scaling cost increases linearly.

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Select all true statements about the differences between mongoexport and mongodump.

• A.mongoexport outputs BSON file, but mongodump outputs JSON file.
• B.mongoexport outputs JSON file, but mongodump outputs BSON file.
• C.mongodump can create a data file and a metadata file, but mongoexport just creates a data file.
• D.By default, mongodump sends output to stdout, but mongoexport writes to a file.
• E.mongodump is typically faster than mongoexport

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Select true statements about unique compound indexes.

• A.In unique compound indexes, individual keys can have duplicate values, and a particular combination of key values must be unique at the collection level.
• B.In unique compound indexes, individual keys must have unique values, and a particular combination of key values must also be unique at the collection level.
• C.MongoDB doesn't support unique compound indexes.

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Select all true statements about replication in MongoDB.

• A.It's a good practice to have replicas in different geographical regions. If one region becomes unavailable due to a major failure in a data center or the network connection to it, the applications will continue to run without downtime.
• B.Replication is also used to prevent downtime in the event of a failure in a data center.

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