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1. Select all true statements about data modeling in MongoDB.

A) MongoDB can easily handle both unstructured and structured data sets.
B) Unlike SQL databases, where the table schema must be specified and declared before inserting the data, MongoDB collections don't, by default, require documents to have the same schema.
C) In MongoDB we can enforce document validation rules for a collection during update and insert operations.
D) The field set and data type for each field can differ across documents within a collection.

2. In your database there is a collection named sales with the following document structure: { _id: ObjectId("5bd761dcae323e45a93ccfe8"), saleDate: ISODate("2015-03-23T21:06:49.506Z"), items: [ { name: 'printer paper', tags: [ 'office', 'stationary' ], price: Decimal128("40.01"), quantity: 2 }, { name: 'notepad', tags: [ 'office', 'writing', 'school' ], price: Decimal128("35.29"), quantity: 2 }, { name: 'pens', tags: [ 'writing', 'school', 'stationary' ], price: Decimal128("56.12"), quantity: 5 } ], storeLocation: 'Denver', customer: { gender: 'M', age: 42, email: '[email protected]', satisfaction: 4 }, purchaseMethod: 'Online' } { _id: ObjectId("5bd761dcae323e45a93ccfe9"), saleDate: ISODate("2015-08-25T10:01:02.918Z"), items: [ { name: 'binder', tags: [ 'school', 'general', 'organization' ], price: Decimal128("28.31"), quantity: 9 }, { name: 'backpack', tags: [ 'school', 'travel', 'kids' ], price: Decimal128("83.28"), quantity: 2 } ], storeLocation: 'Seattle', customer: { gender: 'M', age: 50, email: '[email protected]', satisfaction: 5 }, couponUsed: false, purchaseMethod: 'Phone' } How can you extract all documents from this collection where the first tag in the tags field (Array) is 'office' in at least one item?

A) db.sales.find( { 'items.tags.0': 'office' } )
B) db.sales.find( { 'items.tags.[0]': 'office' } )
C) db.sales.find( { 'items.tags$0': 'office' } )

3. Which cursor method should you use to specify the maximum number of documents returned?

A) cursor.map()
B) cursor.skip()
C) cursor.limit()
D) cursor.count()
E) cursor.hint()

4. Which of the following scenarios is best suited for applying the Attribute Pattern?

A) Some fields share a similar characteristics, and you want to search across those fields.
B) The documents in the collection are quite large.
C) You need to apply document validation before inserting/modifying.

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

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

問題與答案：