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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Security and Access Control | 15% | - Role-based access control - Authentication mechanisms - Encryption, auditing, and security best practices |
| Topic 2: Backup, Recovery and Maintenance | 10% | - Data consistency and integrity checks - Restore procedures and disaster recovery - Logical and physical backup methods |
| Topic 3: Replication and High Availability | 15% | - Failover, elections, read/write concern - Replica set architecture and components - Deployment and maintenance of replica sets |
| Topic 4: MongoDB Architecture and Deployment | 20% | - Storage engines and server management - Core concepts, JSON/BSON, data model - Installation and configuration |
| Topic 5: Monitoring, Performance and Troubleshooting | 10% | - Performance tuning and optimization - Monitoring tools and metrics - Diagnostics and resolving common issues |
| Topic 6: Sharding and Scalability | 10% | - Query routing and cluster operations - Shard keys, chunk management, balancing - Sharded cluster architecture |
| Topic 7: CRUD Operations and Indexing | 20% | - Create, Read, Update, Delete operations - Query optimization and aggregation - Index types, creation, and management |
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NEW QUESTION # 142
Consider the following document:
> db.c.find()
{ "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }
Which of the following queries on the "c" collection will return only the first five elements of the array in the
"b"
field? E.g.,
Document you want returned by your query:
{ "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >
Answer: B
NEW QUESTION # 143
You have the following index on the toys collection:
{
"manufacturer" : 1,
"name" : 1,
"date" : -1
}
Which of the following is able to use the index for the query? Check all that apply.
Answer: A,B,C
NEW QUESTION # 144
What is the correct read preference option to direct all read operations to the secondary?
Answer: B
Explanation:
MongoDB read preference controls which replica-set members are eligible to serve read operations. The mode secondary sends reads only to eligible secondary members. If no suitable secondary is available, the read fails rather than falling back to the primary. That strict behavior is exactly what the question asks for.
secondaryPreferred, option A, normally routes reads to secondaries but can use the primary when no suitable secondary is available, so it does not guarantee that every read is served by a secondary. Options B and C are not valid MongoDB read preference mode names. Secondary reads are useful for specific workloads, but DBAs must account for asynchronous replication: a secondary can lag the primary, so data returned from a secondary may be stale relative to the latest acknowledged primary write. MongoDB provides additional controls such as tag sets and maximum staleness settings to restrict which secondary members are considered acceptable. When the explicit requirement is to direct all reads away from the primary and exclusively to secondary members, secondary is the correct read preference. Therefore option D is correct.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica-set read preferences, secondary reads, and staleness.
NEW QUESTION # 145
Below is a sample document of "orders" collection
Answer:
Explanation:
$sort
NEW QUESTION # 146
Consider the following documents:
You perform the following query;
How many documents will be updated by the query?
Answer: B
NEW QUESTION # 147
......
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