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1. We have the following indexes: { name: 1, founded_year: 1 } { tag_list: 1, is_active: 1 } And the following documents: { _id: ObjectId("52cdef7c4bab8bd675297daa"), name: "Sparter", founded_year: 2007, tag_list: ["gaming", "game", "wow"], is_active: true }, { _id: ObjectId("52cdef7c4bab8bd675297da3"), name: "Yahoo!", founded_year: 1994, tag_list: ["search", "webmail"], is_active: true } Select true statement.

A) There would be a total of 7 index keys created across all of these documents and indexes.
B) There would be a total of 4 index keys created across all of these documents and indexes.
C) There would be a total of 2 index keys created across all of these documents and indexes.

2. Suppose you are connected to mongod instance that is already running on port 27000 as admin user. You have to dump reviews collection from the restaurants database to BSON file. Which command should you use?

A) mongoexport --db restaurants --collection reviews
B) mongodump --db reviews --collection restaurants
C) mongodump --db restaurants --collection reviews

3. Select properly used $out operator.

A) db.collection.aggregate([ { stage1 }, { stage2 }, ..., { stageN }, { $out: "new_collection" } ])
B) db.collection.aggregate([ { $out: "new_collection" }, { stage1 }, { stage2 }, ..., { $stageN } ])
C) db.collection.aggregate([ { stage1 }, { $out: "new_collection" }, { stage2 }, ..., { stageN } ])

4. Suppose you have an accounts collection in your database. Only the following documents are stored in this collection: { _id: ObjectId("61af47c6e29861661d063714"), account_id: 1010, type: 'investment', limit: 2000000 }, { _id: ObjectId("61af47c6e29861661d063715"), account_id: 4336, type: 'derivatives', limit: 100000 }, { _id: ObjectId("61af47c6e29861661d063716"), account_id: 4336, type: 'commodity', limit: 1000 }, { _id: ObjectId("61af47c6e29861661d067825"), account_id: 7355, type: 'commodity', limit: 500000 }, { _id: ObjectId("61b1bde1ceb6f770f56b0cd9"), account_id: 4915, type: 'investment', limit: 2000000 } How many documents will be returned in response to the following aggregation pipeline? [{ $group: { _id: "$type", number_of_accounts: { $sum: 1 } }}, { $match: { number_of_accounts: { $gt: 1 } }}]

A) 2
B) 0
C) 1
D) 3

5. We can use REGEX in our queries in MongoDB - JavaScript regular expression syntax.

A) True
B) False

問題與答案：