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| Section | Objectives |
|---|---|
| Sharding and Scalability | - Shard keys and distribution strategy - Sharded cluster architecture - Balancing and scaling operations |
| Replication and High Availability | - Read/write concerns - Failover and elections - Replica set architecture |
| Indexing and Performance Tuning | - Explain plans and diagnostics - Query performance optimization - Index types and usage |
| Data Modeling | - Relationships in MongoDB - Embedding vs referencing - Schema design principles |
| Security | - Role-based access control (RBAC) - Encryption at rest and in transit - Authentication and authorization |
| Aggregation Framework | - Data transformation and grouping - Aggregation pipeline stages - Aggregation operators |
| MongoDB CRUD Operations | - Querying and filtering documents - Working with documents and BSON types - Insert, update, and delete operations |
| Backup, Restore, and Operations | - Monitoring and maintenance - Backup strategies and tools - Restore procedures |
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NEW QUESTION # 12
Which of the following is a valid Replica Set configuration if you want:
1-Have 3 copies of everything
2- That RS3 is never primary
2- That RSI and RS2 can be primary?
You had to see the different configurations, RS3 could be hidden or priority 0 (But not a referee because we need
3 replicas), while RSI and RS2 could NOT have priority 0 or be hidden or anything like that In a 4-member RS RSO , RSI, RS2 and RS3 + Referee, RSO (primary) falls after some write operations that have replicated RSI and RS2 (but NOT RS3), who can get up as the new primary?
The configuration comes and in it we see that RS2 has a hidden: true (or a priority: 0, (I don't remember)
Answer: A
NEW QUESTION # 13
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called " sample " . Check all that apply.
db.sample.find( { " $or " : [ { " a " : { " $in " : [ 3, 10] > }, { " b " : { " $lt " : 2 > > ] > )
Answer: A,E,F,G,I
NEW QUESTION # 14
Below is a sample document of "orders" collection
Answer:
Explanation:
$project
NEW QUESTION # 15
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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