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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) (C100DBA) certification exams are a great way to analyze and evaluate the skills of a candidate effectively. Big companies are always on the lookout for capable candidates. You need to pass the MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) (C100DBA) certification exam to become a certified professional. This task is considerably tough for unprepared candidates however with the right C100DBA prep material there remains no chance of failure.
| Section | Objectives |
|---|---|
| Topic 1: Sharding | - Cluster Scaling
|
| Topic 2: Application Administration | - Security and Access Control
|
| Topic 3: CRUD Operations | - Data Manipulation
|
| Topic 4: Philosophy and Features | - MongoDB Architecture
|
| Topic 5: Server Administration | - Database Operations
|
| Topic 6: Indexes | - Index Management
|
| Topic 7: Replication | - Replica Sets
|
>> Original C100DBA Questions <<
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NEW QUESTION # 86
Consider the following documents:
You perform the following query;
How many documents will be updated by the query?
Answer: A
NEW QUESTION # 87
Which of the following are common uses of the mongo shell? Check all that apply
Answer: A,B
NEW QUESTION # 88
What is the correct read preference option to direct all read operations to the secondary?
Answer: C
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 # 89
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.
Answer:
Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )
NEW QUESTION # 90
Which of the following operators is used to updated a document partially?
Answer: A
NEW QUESTION # 91
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