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最新的 MongoDB Certified Developer Associate C100DEV 免費考試真題:

1. Select true statements about index performance.

A) Indexes cannot decrease insert throughput.
B) For the fastest processing, we should make sure our indexes fit entirely in RAM.
C) Indexes don't have to be completely stored in RAM, but permanent disk access to retrieve index information will have a performance impact.

2. Which of the following documents are valid JSON format? (select 2)

A) {"_id": 1, "address": {"street": "Stillwell Avenue", "zipcode": "11224"}}
B) {_id: 1, name: "Riviera Caterer", cuisine: "American"}
C) ["_id": 1, "name": "Riviera Caterer", "cuisine": "American"]
D) {"_id": 1, "name": "Riviera Caterer", "cuisine": "American"}
E) <"_id": 1, "name": "Riviera Caterer", "cuisine": "American">

3. Select true statement regarding to the MongoDB Atlas. (select 1)

A) MongoDB Atlas is a MongoDB service that can work with any database.
B) MongoDB Atlas includes many tools and services specifically designed for the MongoDB database.

4. Where is collection metadata stored in a sharded cluster?

A) In a random shard.
B) On the configuration servers.
C) In the primary shard.

5. Select all true statements regarding to $match stage in Aggregation Framework. In your database there is a movies collection with the following document structure: { _id: ObjectId("573a1390f29313caabcd42e8"), genres: [ 'Short', 'Western' ], title: 'The Great Train Robbery', rated: 'TV-G', year: 1903, imdb: { rating: 7.4, votes: 9847, id: 439 }, countries: [ 'USA' ] }, { _id: ObjectId("573a1390f29313caabcd4323"), genres: [ 'Short', 'Drama', 'Fantasy' ], rated: 'UNRATED', title: 'The Land Beyond the Sunset', year: 1912, imdb: { rating: 7.1, votes: 448, id: 488 }, countries: [ 'USA' ] }, { _id: ObjectId("573a1390f29313caabcd446f"), genres: [ 'Short', 'Drama' ], title: 'A Corner in Wheat', rated: 'G', year: 1909, imdb: { rating: 6.6, votes: 1375, id: 832 }, countries: [ 'USA' ] } How can you group these documents to extract all different values for rated field?

A) db.movies.aggregate( { $group: '$rated' } )
B) db.movies.aggregate( { $group: { _id: 'rated' } } )
C) db.movies.aggregate( { $group: { _id: '$rated' } } )

問題與答案：