MongoDB interview questions part 29
MongoDB interview questions part 29
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Total Questions: 20
1. Point out the correct statement :
Correct Answer is : When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys
2. The ___________ collection stores custom roles that administrators create and assign to users to provide access to specific resources.
Correct Answer is : admin.system.roles
3. The _________ field provides the amount of resident memory in use.
Correct Answer is : mem.resident
4. Point out the correct statement :
Correct Answer is : The MongoDB distribution for Solaris include support for the WiredTiger storage engine
5. When the TTL thread is active, you will see _______ operations in the output of db.currentOp().
Correct Answer is : delete
6. MongoDB stores tag sets in the replica set configuration object, which is the document returned by _____
Correct Answer is : rs.conf()
7. Which of the following represents Shared lock ?
Correct Answer is : R
8. On Linux, use the ______ command to check if disk I/O is a bottleneck for your database.
Correct Answer is : iostat
9. Which of the following document configures the threshold which determines whether a query is “slow” for the purpose of the logging system?
Correct Answer is : operationProfiling.slowOpThresholdMs
10. ____________ does not dump the content of the local database.
Correct Answer is : mongodump
11. Point out the correct statement :
Correct Answer is : The data format used by mongodump from version 2.2 or later is incompatible with earlier versions of mongod
12. To backup all the databases in a cluster via mongodump, you should have the ___________ role.
Correct Answer is : backup
13. ___________ is a routing service for MongoDB shard configurations that processes queries from the application layer.
Correct Answer is : mongos
14. Point out the wrong statement :
Correct Answer is : mongodumplocal overwrites output files if they exist in the backup data folder
15. __________ sends all diagnostic logging information to a log file instead of to standard output or to the host’s syslog system.
Correct Answer is : logpath
16. ___________ is the primary daemon process for the MongoDB system.
Correct Answer is : mongod
17. __________ is a diagnostic tool for inspecting BSON files
Correct Answer is : bsondump
18. Which of the following is a utility to check disk I/O performance independently of MongoDB?
Correct Answer is : mongoperf
19. ____________ utility makes it possible to manipulate files stored in your MongoDB instance in GridFS objects from the command line.
Correct Answer is : mongofiles
20. ___________ captures and returns the counts of database operations by type.
Correct Answer is : mongostat
