MCQOPTIONS
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MCQOPTIONS
This section includes 47 Mcqs, each offering curated multiple-choice questions to sharpen your Mongodb knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
____________ does not provide query execution information for the rejected plans. |
| A. | serverstats |
| B. | queryPlanner |
| C. | executionStats |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 2. |
Which of the operator is used to access the query field of documents within system.profile? |
| A. | $select |
| B. | $retrieve |
| C. | $query |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
In _____________ mode, MongoDB returns statistics describing the execution of the winning plan as well as statistics for the other candidate plans captured during plan selection. |
| A. | somePlansExecution |
| B. | allPlansExecution |
| C. | rejPlansExecution |
| D. | none of the mentioned |
| Answer» C. rejPlansExecution | |
| 4. |
All read preference modes except _______ may return stale data. |
| A. | primary |
| B. | primaryPreferred |
| C. | secondary |
| D. | none of the mentioned |
| Answer» B. primaryPreferred | |
| 5. |
For sharded collections, explain returns the __________ for each accessed shard. |
| A. | clientInfo |
| B. | serverInfo |
| C. | serverplan |
| D. | all of the mentioned |
| Answer» C. serverplan | |
| 6. |
The memory usage statuses metrics of the _________ output can provide insight into MongoDB’s memory use. |
| A. | globalstats |
| B. | serverStatus |
| C. | locks.deadlockCount |
| D. | all of the mentioned |
| Answer» C. locks.deadlockCount | |
| 7. |
If the query planner selects a collection scan, the explain result includes a _________ stage. |
| A. | COLLSCAN |
| B. | TABLESCAN |
| C. | ROWSCAN |
| D. | All of the mentioned |
| Answer» B. TABLESCAN | |
| 8. |
Which field does not support TTL indexes? |
| A. | _identity |
| B. | _option |
| C. | _id |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 9. |
Which of the following is especially important in Sharded Clusters? |
| A. | NSS |
| B. | STP |
| C. | NTP |
| D. | SSD |
| Answer» B. STP | |
| 10. |
Which of the following command obtains a global write lock and will block other operations until it has completed? |
| A. | ToCapped |
| B. | isCapped |
| C. | convertToCapped |
| D. | None of the mentioned |
| Answer» C. convertToCapped | |
| 11. |
Which of the following preference does not affect the visibility of data? |
| A. | read |
| B. | write |
| C. | read and write |
| D. | none of the mentioned |
| Answer» B. write | |
| 12. |
______ field contains total number of current clients that connect to the database instance. |
| A. | available |
| B. | current |
| C. | always avail |
| D. | none of the mentioned |
| Answer» C. always avail | |
| 13. |
Which of the following collection do not support the TTL property? |
| A. | Compound indexes |
| B. | Primary indexes |
| C. | Composite indexes |
| D. | All of the mentioned |
| Answer» B. Primary indexes | |
| 14. |
MongoDB’s _______ is a database profiling system that can help identify inefficient queries and operations. |
| A. | Reporter |
| B. | Executer |
| C. | Profiler |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 15. |
___________ convert a non-capped collection to a capped collection. |
| A. | ToCapped |
| B. | convertToCap |
| C. | convertToCapped |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 16. |
You cannot create a TTL index on a ________ collection. |
| A. | Sharded |
| B. | Capped |
| C. | Primary |
| D. | None of the mentioned |
| Answer» C. Primary | |
| 17. |
_________ command creates the capped collection and imports the data. |
| A. | CollectionAsCapped |
| B. | cloneCollection |
| C. | cloneCollectionAsCapped |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 18. |
serverStatus includes all fields by default, except _________ |
| A. | rangeDeleter |
| B. | rangeDelete |
| C. | rangeDEL |
| D. | none of the mentioned |
| Answer» C. rangeDEL | |
| 19. |
Which of the following provides information on the MongoDB instance? |
| A. | serverInfo |
| B. | queryPlanner |
| C. | executeStats |
| D. | none of the mentioned |
| Answer» B. queryPlanner | |
| 20. |
_________ corresponds to the millis field returned by cursor.explain() in earlier versions of MongoDB. |
| A. | executionMillis |
| B. | executionTimeMillis |
| C. | timemillis |
| D. | all of the mentioned |
| Answer» C. timemillis | |
| 21. |
Which of the following should is used to check whether collection is capped or not? |
| A. | isCAP() |
| B. | isCapped() |
| C. | isColl() |
| D. | none of the mentioned |
| Answer» C. isColl() | |
| 22. |
If the query planner selects a _________ the explain result includes an IXSCAN stage. |
| A. | Index |
| B. | Replica Set |
| C. | Document |
| D. | None of the mentioned |
| Answer» B. Replica Set | |
| 23. |
____________ returns information on the query plan for aggregate function. |
| A. | Reporter |
| B. | db.collection.explain() |
| C. | db.collection.explainplan() |
| D. | None of the mentioned |
| Answer» C. db.collection.explainplan() | |
| 24. |
Which of the following collections work in a way similar to circular buffers? |
| A. | Capped |
| B. | Secondary |
| C. | Sharded |
| D. | All of the mentioned |
| Answer» B. Secondary | |
| 25. |
Which of the following should not be used to provide extra capacity for reads? |
| A. | primary |
| B. | primaryPreferred |
| C. | secondary |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 26. |
Which of the following setting defines what constitutes a “slow” operation? |
| A. | slowOpThresholdGs |
| B. | fastOpThresholdMs |
| C. | slowOpThresholdMs |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 27. |
The TCP keepalive on the Azure load balancer is ______ seconds by default. |
| A. | 100 |
| B. | 200 |
| C. | 240 |
| D. | None of the mentioned |
| Answer» B. 200 | |
| 28. |
MongoDB stores tag sets in the replica set configuration object, which is the document returned by ____________ |
| A. | rs.config() |
| B. | rs.conf() |
| C. | rs.confstats() |
| D. | all of the mentioned |
| Answer» C. rs.confstats() | |
| 29. |
MongoDB reports its triggered page faults as the total number of page faults in ________ second. |
| A. | 1 |
| B. | 100 |
| C. | 1000 |
| D. | None of the mentioned |
| Answer» B. 100 | |
| 30. |
_____ is a command-line tool for monitoring network use. |
| A. | bwm-ng |
| B. | bwm-g |
| C. | bwm-n |
| D. | bwm-ngs |
| Answer» B. bwm-g | |
| 31. |
By default, db.collection.explain() runs in ___________ verbosity mode. |
| A. | VerbosityMode |
| B. | queryPlanner |
| C. | executeStats |
| D. | none of the mentioned |
| Answer» C. executeStats | |
| 32. |
Read preference modes are also available to clients connecting to a sharded cluster through ______________ |
| A. | MMS |
| B. | mongos |
| C. | mongod |
| D. | none of the mentioned |
| Answer» C. mongod | |
| 33. |
Which of the following parameter specifies the verbosity mode for the explain output? |
| A. | verbosity |
| B. | verbose |
| C. | queryPlanner |
| D. | none of the mentioned |
| Answer» C. queryPlanner | |
| 34. |
You can inspect __________ to check the amount of mapped memory that mongod is using. |
| A. | mem.mapped |
| B. | memory.resident |
| C. | mem.resident |
| D. | all of the mentioned |
| Answer» B. memory.resident | |
| 35. |
With the _______ storage engine, MongoDB uses memory-mapped files to store data. |
| A. | MMAPv2 |
| B. | MMAPv1 |
| C. | WiredTiger |
| D. | All of the mentioned |
| Answer» C. WiredTiger | |
| 36. |
You cannot use _________ to change the value of expireAfterSeconds of an existing index. |
| A. | createIndex() |
| B. | dropIndex() |
| C. | removeIndex() |
| D. | none of the mentioned |
| Answer» B. dropIndex() | |
| 37. |
Which of the following storage engine is supported by default? |
| A. | MMAPv1 |
| B. | WiredTiger |
| C. | WirelessTiger |
| D. | All of the mentioned |
| Answer» B. WiredTiger | |
| 38. |
The ________ command returns information regarding the number of open connections. |
| A. | connPoolStats |
| B. | connStats |
| C. | serverstats |
| D. | none of the mentioned |
| Answer» B. connStats | |
| 39. |
________ do not typically provide sufficient performance to support a MongoDB deployment. |
| A. | RAID-5 |
| B. | RAID-10 |
| C. | RAID-7 |
| D. | None of the mentioned |
| Answer» B. RAID-10 | |
| 40. |
Which of the following should be avoided with MongoDB Deployments? |
| A. | RAID-5 |
| B. | RAID-10 |
| C. | RAID-7 |
| D. | RAID-0 |
| Answer» E. | |
| 41. |
With the WiredTiger storage engine, use of _______ is strongly recommended to avoid performance issues. |
| A. | XFS |
| B. | SSD |
| C. | SST |
| D. | All of the mentioned |
| Answer» B. SSD | |
| 42. |
Which of the following setting defines what constitutes a “slow” operation ?$# |
| A. | slowOpThresholdGs |
| B. | fastOpThresholdMs |
| C. | slowOpThresholdMs |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 43. |
______ field contains total number of current clients that connect to the database instance? |
| A. | available |
| B. | current |
| C. | always avail |
| D. | none of the mentioned |
| Answer» C. always avail | |
| 44. |
serverStatus includes all fields by default, except _________ . |
| A. | rangeDeleter |
| B. | rangeDelete |
| C. | rangeDEL |
| D. | none of the mentioned |
| Answer» C. rangeDEL | |
| 45. |
The __________ data structure value provides more granular information concerning the number of operations queued because of a lock. |
| A. | currentQueue |
| B. | curQueue |
| C. | currentQu |
| D. | none of the mentioned |
| Answer» B. curQueue | |
| 46. |
If __________ is high relative to uptime, the database has existed in a lock state for a significant amount of time. |
| A. | globalLock.halfTime |
| B. | globalLock.totalTime |
| C. | globalLock.downTime |
| D. | all of the mentioned |
| Answer» C. globalLock.downTime | |
| 47. |
________ provide the number of times the lock acquisitions encountered deadlocks. |
| A. | locks.deadlock |
| B. | lock.deadlockCount |
| C. | locks.deadlockCount |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |