MongoDB interview questions part 33
MongoDB interview questions part 33
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Total Questions: 20
1. ________ contains a counter of the total number of clients with active operations in progress or queued.
Correct Answer is : globalLock.activeClients
2. Point out the correct statement :
Correct Answer is : All of the mentioned
3. ________ provide the number of times the lock acquisitions encountered deadlocks.
Correct Answer is : locks.deadlockCount
4. If __________ is high relative to uptime, the database has existed in a lock state for a significant amount of time.
Correct Answer is : globalLock.totalTime
5. Point out the wrong statement :
Correct Answer is : The storage.wiredTiger.indexConfig.prefixCompression setting does not affect all indexes created
6. The __________ data structure value provides more granular information concerning the number of operations queued because of a lock.
Correct Answer is : currentQueue
7. serverStatus includes all fields by default, except _________ .
Correct Answer is : rangeDelete
8. ______ field contains total number of current clients that connect to the database instance.
Correct Answer is : current
9. MongoDB’s _______ is a database profiling system that can help identify inefficient queries and operations.
Correct Answer is : Profiler
10. Which of the following setting defines what constitutes a “slow” operation ?
Correct Answer is : slowOpThresholdMs
11. With the _______ storage engine, MongoDB uses memory-mapped files to store data.
Correct Answer is : MMAPv1
12. Point out the correct statement :
Correct Answer is : For read-heavy applications, increase the size of your replica set and distribute read operations to secondary members
13. The memory usage statuses metrics of the _________ output can provide insight into MongoDB’s memory use.
Correct Answer is : serverStatus
14. The _________ field provides the amount of resident memory in use.
Correct Answer is : mem.resident
15. Point out the wrong statement :
Correct Answer is : A single page fault completes slowly and is problematic
16. You can inspect __________ to check the amount of mapped memory that mongod is using.
Correct Answer is : mem.mapped
17. MongoDB reports its triggered page faults as the total number of page faults in ________ second.
Correct Answer is : 1
18. Which of the operator is used to access the query field of documents within system.profile ?
Correct Answer is : $query
19. ____________ returns information on the query plan for aggregate function.
Correct Answer is : db.collection.explain()
20. By default, db.collection.explain() runs in ___________ verbosity mode.
Correct Answer is : queryPlanner
