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| Section | Weight | Objectives |
|---|---|---|
| CRUD Operations and Indexing | 20% | - Query optimization and aggregation - Create, Read, Update, Delete operations - Index types, creation, and management |
| Sharding and Scalability | 10% | - Shard keys, chunk management, balancing - Sharded cluster architecture - Query routing and cluster operations |
| Monitoring, Performance and Troubleshooting | 10% | - Monitoring tools and metrics - Diagnostics and resolving common issues - Performance tuning and optimization |
| Replication and High Availability | 15% | - Deployment and maintenance of replica sets - Failover, elections, read/write concern - Replica set architecture and components |
| Security and Access Control | 15% | - Role-based access control - Encryption, auditing, and security best practices - Authentication mechanisms |
| Backup, Recovery and Maintenance | 10% | - Data consistency and integrity checks - Logical and physical backup methods - Restore procedures and disaster recovery |
| MongoDB Architecture and Deployment | 20% | - Core concepts, JSON/BSON, data model - Installation and configuration - Storage engines and server management |
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NEW QUESTION # 125
Which of the following commands will return all the posts with number of likes greater than 100 and less than 200, both inclusive?
Answer: B
NEW QUESTION # 126
What operation updates the value of the unitsInStock field to 25 for a document with a " laptop " product, and inserts a new document if it does not exist?
Answer: D
Explanation:
An upsert combines update behavior with conditional insertion. updateOne() first searches for a document matching { product: " laptop " }. If one exists, $set changes unitsInStock to 25. If none exists and the options document contains { upsert: true }, MongoDB inserts a new document based on the equality portions of the filter together with the update result. Option A uses exactly this pattern. Options B and C incorrectly use insertOne(), which inserts a supplied document and does not accept an update-operator document plus upsert semantics in this form. Option D uses the correct method and update structure but specifies True with a capital T. Mongosh uses JavaScript Boolean syntax, so the literal must be lowercase true. Upserts are useful when an application needs to ensure that a logical entity exists after an operation, but DBAs should consider a unique index on the identifying field when duplicate creation by concurrent requests must be prevented.
Given the choices, updateOne(..., {$set:...}, {upsert:true}) is the valid operation, so A is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - updateOne(), $set, upserts, and Boolean syntax.
NEW QUESTION # 127
What read preference should your application use if you want to read from the primary under normal circumstances but allow reads from secondaries when a primary is unavailable?
Answer: A
NEW QUESTION # 128
You perform the following query on the sayings collection, which has the index
{ quote : "text" }:
Assuming the documents below are in the collection, which ones will the following query return? Check all that apply.
db.sayings.find( { $text : { $search : "fact find" } } )
Answer: A,C
NEW QUESTION # 129
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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