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| Section | Objectives |
|---|---|
| Philosophy and Features | - MongoDB Architecture
|
| CRUD Operations | - Data Manipulation
|
| Replication | - Replica Sets
|
| Indexes | - Index Management
|
| Application Administration | - Security and Access Control
|
| Server Administration | - Database Operations
|
| Sharding | - Cluster Scaling
|
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NEW QUESTION # 15
Consider the following documents:
You perform the following query;
How many documents will be updated by the query?
Answer: E
NEW QUESTION # 16
MongoDB is
Answer: B
NEW QUESTION # 17
We can insert multiple documents in bulk using which of the following operations:
Answer: C
NEW QUESTION # 18
A MongoDB database administrator needs to improve the performance of the following query:
db.employees.find(
{},
{ name: 1, department: 0, salary: 1 }
).sort({ department: 1, salary: -1 });
What index should the administrator use to achieve this goal?
Answer: B
Explanation:
For a compound index to satisfy a multi-field sort, the indexed fields must occur in the same sequence as the sort specification, and their directions must either match the requested pattern or be the complete reverse of it.
The query sorts by { department: 1, salary: -1 }, so option B exactly matches both the key order and the requested directions. MongoDB can scan that index and return the results already ordered, avoiding a blocking in-memory sort. Option A uses { department: 1, salary: 1 }, which does not match the mixed- direction sort and is not its full inverse. Option D puts name before the two sort keys. Because the query has no equality predicate on name, that leading key prevents the later fields from directly providing the requested global sort. Option C is not a sensible index definition for this workload. Separately, the displayed projection mixes inclusion and exclusion (name:1, salary:1, department:0), which MongoDB normally disallows except for _id; that syntax issue should be corrected independently. It does not change the intended index answer for the sort, which is B.
Study Guide reference/topic:Indexing and Query Optimization - compound indexes, sort support, index prefixes, and key direction.
NEW QUESTION # 19
You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest.
Which comparison order is used?
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