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Describe content sources that can be monitored by MongoDB software

MongoDB software provides a number of different tools for monitoring your deployment.

The MongoDB Management Service (MMS) is a fully-managed service that monitors MongoDB instances and applications. MMS offers the following features:

  • Monitoring and alerting for MongoDB instances and applications, including application-level metrics

  • Automatic detection of new deployments

  • Automated failure detection and recovery

Alerting on resource utilization, including CPU and memory usage, disk utilization, network throughput, latency, and more. Alerts can be sent by email or SMS message. You can also configure MMS to generate synthetic transactions against your database to generate alerts when performance degrades.

In addition to MMS, you can use third-party tools such as New Relic's MongoDB agent or OpsDash to monitor your deployments.

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MongoDB Certified Developer Associate Exam Sample Questions (Q248-Q253):

NEW QUESTION # 248
We can use this pattern to work with different schema versions. It mainly involves adding a new field to the document structure, such as schema_version. This field will allow our application to know how to handle particular document. Which pattern does this description apply to?

  • A. The Outlier Pattern.
  • B. The Subset Pattern.
  • C. The Polymorphic Pattern.
  • D. The Schema Versioning Pattern.
  • E. The Attribute Pattern.

Answer: D

Explanation:
https://www.mongodb.com/blog/post/building-with-patterns-the-schema-versioning-pattern


NEW QUESTION # 249
You have the following index in a movies collection: { "title": 1, "imdb.rating": -1, "imdb.votes": -1, "type": 1 } Can the following query use the given index for both filtering and sorting?
db.movies.find( { "imdb.rating": 8, "title": "James Bond" } ).sort( { "imdb.votes": -1 } )

  • A. Yes
  • B. No

Answer: A

Explanation:
Yes, this query can use the index prefix. The order of the fields in the query predicate does not matter. Since both "imdb.rating" and "title" are part of an index prefix, this query can use the index for an equality condition. https://docs.mongodb.com/manual/indexes/


NEW QUESTION # 250
Select true statements about unique compound indexes.

  • A. MongoDB doesn't support unique compound indexes.
  • B. In unique compound indexes, individual keys can have duplicate values, and a particular combination of key values must be unique at the collection level.
  • C. In unique compound indexes, individual keys must have unique values, and a particular combination of key values must also be unique at the collection level.

Answer: B

Explanation:
https://docs.mongodb.com/manual/core/index-compound/


NEW QUESTION # 251
The greater the cardinality of a field, the...

  • A. more useful an index created on this field will be.
  • B. less useful an index created on this field will be.

Answer: A


NEW QUESTION # 252
Let's consider a one-to-many relationship observed between an instructor and the courses he is created on an e-learning platform. We assume that a course can only have one instructor, and an instructor can have multiple courses. Which of the following are the correct ways to represent this one-to-many relationship with a document model in MongoDB?

  • A. Have a collection for the instructors and a collection for the courses with each course document having a field to reference the document of its instructor.
  • B. Embed all the fields for a course as a subdocument in the corresponding instructor document.
  • C. Embed the entities for the courses as an array of sub-documents in the corresponding instructor document.

Answer: A,C

Explanation:
Embed all the fields for a course as a subdocument in the corresponding instructor document.
These subdocuments must be put into an array, not stored directly as a subdocument in its parent.
This way we can have a variable number of referenced documents and use a multi-key index to search the "many" side. This is not the best way to do it.
https://docs.mongodb.com/manual/tutorial/model-embedded-one-to-many-relationships-between-documents/


NEW QUESTION # 253
......

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