In mongodb how do you update a document partially?

• A.$project
• B.$update
• C.$set
• D.$modify

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

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Below is a sample document of "orders" collection

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Which of the following is true about aggregation framework?

• A.Pipeline expressions are stateless except accumulator expressions used with $group operator
• B.Each aggregation operator need to return atleast one of more documents as a result
• C.the aggregate command operates on a multiple collection
• D.A single aggregation framework operator can be used more than once in a query

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Which command is used to determine storage capacity of specific database?

• A.mongostat
• B.constats
• C.mongotop
• D.dbstats

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