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| Section | Objectives |
|---|---|
| Topic 1: Replication | - Replica Sets
|
| Topic 2: CRUD Operations | - Data Manipulation
|
| Topic 3: Application Administration | - Security and Access Control
|
| Topic 4: Indexes | - Index Management
|
| Topic 5: Sharding | - Cluster Scaling
|
| Topic 6: Server Administration | - Database Operations
|
| Topic 7: Philosophy and Features | - MongoDB Architecture
|
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NEW QUESTION # 121
If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?
Answer: A
NEW QUESTION # 122
What command adds a document to the class101 collection where the student is " Randall " and the student passed the class?
Answer: A
Explanation:
db.collection.insertOne() inserts one BSON document into a collection. In mongosh, string values must be quoted and Boolean literals use JavaScript syntax: lowercase true or false. Therefore the student ' s name must appear as " Randall " , and the passed flag must be true. Option D is the only choice that gets both value types correct. Option A quotes the string properly but uses True, which is not the JavaScript Boolean literal.
Options B and C leave Randall unquoted, so mongosh would interpret it as an identifier or variable rather than as the literal string required by the document. Option C additionally uses the invalid capitalized Boolean form.
If an _id field is omitted, MongoDB automatically adds a unique _id, typically an ObjectId, before storing the document. That behavior does not affect the two requested fields. This question tests both CRUD syntax and the BSON/JavaScript literal representation used by mongosh. The correct command is db.class101.insertOne ({ student: " Randall " , passed: true }), so option D is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - insertOne(), BSON values, strings, Booleans, and automatic _id.
NEW QUESTION # 123
Which of the following statements are true about the $match pipeline operator? Check all that apply.
Answer: A,B,C
NEW QUESTION # 124
The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:
Answer: D
NEW QUESTION # 125
What method should be used to configure dynamically runtime parameters for the mongod process in MongoDB?
Answer: A
Explanation:
MongoDB exposes server parameters that can be configured through the parameter framework. Among the choices, --setParameter is the option specifically designed to set a server parameter on the mongod command line, using syntax such as mongod --setParameter < name > = < value > . A configuration file can also contain a setParameter section, but --config by itself merely tells mongod which configuration file to load; it is not the parameter-setting mechanism identified by the question. Connection-string options control how clients connect and cannot be used to configure arbitrary server runtime parameters. Option D is also incorrect because the server must already be running for mongosh to issue administrative commands. A technical nuance is important: parameters that support modification while the process is already running are changed with the administrative setParameter command, for example db.adminCommand({setParameter:1, ...}). Such runtime changes may not persist across a restart unless the value is also configured for startup. Given the options provided and the exam wording, --setParameter is the intended method, so A is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - server parameters, --setParameter, configuration files, and runtime administration.
NEW QUESTION # 126
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