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| Section | Objectives |
|---|---|
| Topic 1: Server Administration | - Database Operations
|
| Topic 2: Sharding | - Cluster Scaling
|
| Topic 3: Application Administration | - Security and Access Control
|
| Topic 4: Replication | - Replica Sets
|
| Topic 5: CRUD Operations | - Data Manipulation
|
| Topic 6: Indexes | - Index Management
|
| Topic 7: Philosophy and Features | - MongoDB Architecture
|
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NEW QUESTION # 73
Which of the following command is used to get all the indexes on a collection?
Answer: A
NEW QUESTION # 74
A MongoDB collection named users contains sample documents with fields including name, age, address, description, city, and occupation.
The administrator uses the following query to perform a collection scan:
db.users.find({ city: " New York " , occupation: " Software Engineer " }) What compound index will improve the performance of the query the MOST?
Answer: B,C
Explanation:
The query contains equality predicates on both city and occupation, so an efficient compound index should contain both fields. Options A and C include only one query predicate plus the unrelated name field, forcing MongoDB to perform additional filtering that the index cannot resolve. Options B and D both contain the complete predicate set. For a query consisting entirely of equality predicates, MongoDB does not require those equality keys to appear in a particular order relative to one another for the query itself; { city: 1, occupation: 1 } and { occupation: 1, city: 1 } can both support the two equality conditions effectively. The original question appears to expect B because it mirrors the field order used in the query, but that distinction is not technically required under MongoDB ' s equality-key guidance. Field order becomes much more significant when the workload also needs a particular index prefix, sort order, range predicate, or when one ordering better supports additional common queries. Accordingly, the technically accurate review result is B and D, with B being the likely intended exam choice.
Study Guide reference/topic:Indexing and Query Optimization - compound indexes, equality predicates, and index key ordering.
NEW QUESTION # 75
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?
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