MongoDB Certified Developer Associate 認定 C100DEV 試験問題:
1. Suppose we have a products collection with the following fields and values: _id (automatically created ObjectId) product_code (unique values for each product) color (as String values) size (this field is missing for some products) origin_country Which of these fields would be the best shard key?
A) product_code
B) size
C) color
D) _id
E) origin_country
2. What is a document in MongoDB?
A) It's an ordered collection of keys (fields) with assigned values. The keys in each document are strings of characters. Documents in MongoDB cannot contain duplicate keys.
B) It's a text file containing the configuration of the MongoDB instance.
C) It's a table that contains information about all collections in the database.
3. Suppose you have a following index for football_palyers collection: { "last_name": 1, "details.country": 1, "details.club": 1, "age": 1 } Determine which queries are able to successfully use a given index for both filtering and sorting.
A) db.football_players.find( { "last_name": { "$gte": "L" } } ).sort( { "details.club": -1 } )
B) db.football_players.find( { "last_name": "Lewandowski", "details.country": { "$gt": "D" } } ).sort( { "details.country": 1 } )
C) db.football_players.find( { "last_name": "Lewandowski" } ).sort( { "details.country": 1, "details.club": 1 } )
4. Select all true statements regarding to $out stage.
A) $out operator must be the last stage in a pipeline.
B) All indexes on an existing collection are rebuilt when $out overwrites the collection.
C) $out operator creates collections in the same database as the source collection.
D) $out operator will overwrite an existing collection if specified.
E) $out operator will create a new empty collection or overwrite an existing collection if the pipeline raises an error.
5. Suppose you want to create a unique compound index on two fields. It turns out, however, that the collection has duplicate pairs of values for these fields.
What happens if you try to create an index like this?
A) MongoDB will report an error.
B) The index will be created and no documents will be deleted.
C) The index will be created and duplicate documents will be removed in random order.
質問と回答：
| 質問 # 1 正解： A | 質問 # 2 正解： A | 質問 # 3 正解： B、C | 質問 # 4 正解： A、B、C、D | 質問 # 5 正解： A |
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