C100DBA 무료 덤프문제 온라인 액세스

We can insert multiple documents in bulk using which of the following operations:

• A.initializeBulkOp
• B.initializeBulk
• C.initializeUnorderedBulk
• D.initializeUnorderedBulkOp

Which of the following operator can be used to control the number of items of an array that a query returns?

• A.$ elemMatch
• B.MongoDB does not support partial retrieval of items from an array
• C.$
• D.$slice

Below is a sample document in a given collection test.
{ a : 5, b : 3, c: 2, d : 1 }
Given a compound index { a: 1, b:l, c:l, d:l}, Which of the below query will not use in-memory sorting? Select all valid.

• A.db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 } )
• B.db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )
• C.db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )
• D.db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )

Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

• A.db.posts.createIndex({commerits.$.author":-l});
• B.db.posts.createIndex({comments.$.author": {$desc:l>});
• C.db.posts.createIndex({comments.author":-l});

What is the maximum size of a MongoDB document?

• A.12 MB
• B.2 MB
• C.There is no maximum size. It depends on the RAM.
• D.16 MB