Free MongoDB C100DBA Exam Dumps Questions & Answers

What command is used to grant a role " customRole1 " to an existing user called " user1 " ?

• A.db.grantRoles( " user1 " , [ " customRole1 " ])
• B.db.createUser({ user: " user1 " , pwd: " pwd1 " , roles: [{ role: " customRole1 " , db: " admin " }] })
• C.db.grantRolesToUser( " user1 " , [ " customRole1 " ])
• D.db.addRoleToUser( " user1 " , [ " customRole1 " ])

In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal. What should be the value of j?

• A.7
• B.0
• C.2
• D.1

You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?

• A.A document will be inserted with the same _id as the last document inserted
• B.An empty document
• C.No document will be inserted; an error will be raised
• D.A document with an _id assigned to be an Objectld
• E.A document that matches the collection ' s existing schema, but with null fields

Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })

• A.db.test.ensurelndex( { a : 1, c: 1, d: 1, b : 1})
• B.db.test.ensurelndex( { c:l, a: 1})
• C.CH db.test.ensurelndex( { a :1, c:l})
• D.db.test.ensurelndex( { a: 1, b :1, c:l, d:l})

Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.

• A.$match
• B.$group
• C.$aggregate
• D.$sum