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| Section | Objectives |
|---|---|
| Topic 1: Philosophy and Features | - MongoDB Architecture
|
| Topic 2: Application Administration | - Security and Access Control
|
| Topic 3: Server Administration | - Database Operations
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| Topic 4: Indexes | - Index Management
|
| Topic 5: Sharding | - Cluster Scaling
|
| Topic 6: CRUD Operations | - Data Manipulation
|
| Topic 7: Replication | - Replica Sets
|
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NEW QUESTION # 77
'mongoimport' command is used for
Answer: D
NEW QUESTION # 78
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply.
db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )
Answer: A,E,G,H,I
NEW QUESTION # 79
A user stores movie data in a collection called movies. The collection contains thousands of documents.
A sample document looks like this:
{ " title " : " Titanic " , " year " : 1997, " rating " : 8.6 }
The user runs the following query to sort movies first by year, and then by rating:
db.movies.find().sort({ " year " : 1, " rating " : -1 })
Which index would improve the query ' s performance the MOST?
Answer: D
Explanation:
MongoDB can use a compound index to satisfy a multi-field sort when the sort keys appear in the same sequence as the index keys and the requested directions either match the index pattern or are the exact reverse of the entire pattern. The query sorts by { year: 1, rating: -1 }. Option B defines { year: -1, rating: 1 }, which is the complete inverse, so MongoDB can scan that index backward and produce year ascending with rating descending without a blocking in-memory sort. Option A puts title between year and rating; because there is no equality condition fixing title, the index cannot provide a global ordering by { year, rating } across all titles. Options C and D put rating before year, so their primary index ordering does not match the query ' s primary sort key. For multi-field sorts, field sequence is just as important as direction. Therefore B is the strongest index among the presented choices. A forward index { year: 1, rating: -1 } would also be ideal, but it is not offered.
Study Guide reference/topic:Indexing and Query Optimization - compound index sort order, reverse traversal, and index prefixes.
NEW QUESTION # 80
Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?
Answer: C
NEW QUESTION # 81
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?