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| Section | Objectives |
|---|---|
| CRUD Operations | - Data Manipulation
|
| Indexes | - Index Management
|
| Replication | - Replica Sets
|
| Application Administration | - Security and Access Control
|
| Sharding | - Cluster Scaling
|
| Philosophy and Features | - MongoDB Architecture
|
| Server Administration | - Database Operations
|
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NEW QUESTION # 27
Consider the following posts document:
Which of the following queries will return the documents but with only the first two tags in the tags array?
Answer: C
NEW QUESTION # 28
Which TWO commands can be used to check for all active operations on the current node?
Answer: A,D
Explanation:
db.currentOp() is the mongosh helper used to inspect operations currently executing on a MongoDB server.
Passing true requests a broad view that includes all in-progress operations as well as additional idle/system entries, so it can be used when the administrator wants to see the complete current-operation picture. The database-command form, db.adminCommand({ currentOp: true }), invokes the corresponding administrative command and is also valid for obtaining in-progress operation information. Option A adds a filter restricting the result to operations whose op field is " command " ; it therefore does not represent all operation types.
Option B is not valid currentOp command syntax, and option E uses an all field that is not the documented special form for this helper. In modern MongoDB administration, the $currentOp aggregation stage is generally preferred for richer filtering and aggregation, but the question is testing the traditional helper and command interfaces. Therefore, C and D are the two valid choices among those presented.
Study Guide reference/topic:Performance Monitoring and Tuning - current operations, currentOp, and administrative diagnostics.
NEW QUESTION # 29
Which of the following does MongoDB use to provide High Scalability?
Answer: A
NEW QUESTION # 30
A MongoDB administrator is currently managing a single node MongoDB Enterprise deployment. The administrator is considering setting up replication with a secondary node and a delayed member.
Which TWO reasons align to the objectives of the administrator?
Answer: C,D
Explanation:
Adding replica-set members addresses availability and recovery objectives. A normal secondary maintains a replicated copy of the primary ' s data and can be elected primary if the current primary becomes unavailable, thereby improving service availability compared with a single-node deployment. That directly supports option D: A delayed member intentionally applies oplog entries later than the primary, preserving an older logical state of the dataset for a configured delay period. This can help recover from operator mistakes such as an accidental destructive update or drop operation because the administrator may be able to access the delayed copy before the damaging operation is applied there. That supports option A. A delayed member is not a substitute for long-term archival or a formal backup-retention policy; its recoverable history is constrained by the delay configuration and oplog window, so B is not the intended objective. Option C describes sharding, which partitions data across shards rather than simply replicating it. Encryption at rest is configured independently and is unrelated to adding secondaries or delayed members. Therefore, A and D are the two reasons that align with the proposed replication design.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica sets, delayed members, failover, and operator-error recovery.
NEW QUESTION # 31
Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?
Answer: B
NEW QUESTION # 32
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