MongoDB MCQ Questions Answers

1. In what language(s) is MongoDB supported?

2. The binary log of transactions used to recover the database after a crash is called the:

3. MongoDB's query language uses operators that start with which character?

4. TSV files should be expected to contain:

5. MongoDB stores documents in structures called

6. To perform a search on a collection, and obtain a cursor object for the results, use:

7. The MongoDB database is capable of:

8. Which of the following statement are true

9. What does MongoDB's Sharding provide?

10. Which of the following expressions are valid JSON documents?

11. You can write custom MapReduce functions in MongoDB using:

12. The maximum BSON document size is:

13. This replication process is

14. Which of the following would you use to query an inventory collection to get all items of type "food" with price less than $34?

15. Which of the following is syntactically correct for searching the "posts" collection for a post with the title of "Big News Story"?

16. The interactive "mongo" shell interface is based on:

17. How can you optimize document storage?

18. Which of the following terms describe MongoDB?

19. MongoDB supports UTF-8 for strings in stored objects and queries:

20. Instead of tables, MongoDB stores data in structures called:

21. When a journal file holds 1 gigabyte of data, MongoDB creates a new journal file?

22. Which platform does MongoDB support?

23. To create an index for user_name field on user collection, which of the following is the correct syntax?

24. The map-reduce operation uses a temporary collection for data processing; The benefit of this behavior is that the operations:

25. Which method should be used to create an index on a collection, if it does not already exist?

26. Which of the following statements are true about MongoDB

27. Which of the following are considered Core MongoDB operations?

28. The currently preferred replication method is called:

29. The core database operations in MongoDB are abbreviated as:

30. To atomically modify and return a single document from a collection, use:

31. Indexes in mongodb are NOT good for:

32. Which feature of mongoDB is used to balance load among multiple machines?

33. Which statement of the followings could NOT drop an index?

34. MongoDB uses GridFS to:

35. In MongoDB V2.4, what type of JavaScript engine is used to execute all JavaScript on Mongo shell ?

36. True or False? MongoDB can have foreign keys.

37. The aggregation framework is most similar to which facility from the world of relational databases

38. MongoDB's Replication can be in Master-Slave form or _______ form.

39. When Storing large files in MongoDB one is encouraged to use...

40. Which of the following atomic operations would you use to add a value to an array only if it does not already exist in the array?

41. Authentication in MongoDB is:

42. What's the difference between `save()` and `insert()` in mongo shell?

43. MongoDB can have indexes on Array Elements?

44. MongoDB uses the acronym TTL to mean:

45. Which feature of mongoDB is used for data redundancy?

46. While replication provides data redundancy, journaling is also recommended because:

47. Indexing

48. Which of the following is not a stage in the aggregation pipeline

49. An operation is said to be "idempotent" if it is proven to:

50. Which of the following binaries handles routing of sharded queries to the proper shard?

51. MongoDB document names cannot start with the characters:

52. What is the extra space allocated to document on the disk to prevent moving a document when it grows as the result of update() operations.

53. What do drivers use with protocol on the wire?

54. Due to their default behavior, Capped Collections are ideal for storing:

55. When a Capped Collection becomes full, and a new document is added:

56. "write concern" allows an application to:

57. A Priority 0 or "passive" replica member:

58. "read preference" affects how an application:

59. All writes in MongoDB Must go the primary

60. What is the easiest way to do tasks like totaling or averaging field values in MongoDB newer versions?

61. If you have a compound index on multiple fields (a,b,c), you can use it to query on:

62. What is the correct aggregation pipeline to prefix all the values of the 'name' column in the 'test' collection?

63. How many collections are created when use use gridfs to store large files

64. The equivalent for like %keyword% on mongodb find is:

65. Which of the following is the correct operation to query a document for both 'Football' and "Reading" within the interests data collected from a profile?

66. Which of the following statements are true about the MongoDB Write Consistency model

67. Which of the following is not a BSON serialization type?

68. How many data types are available in MongoDB?

69. Which datum does MongoDB use for calculating geospatial coordinates?

70. When a replica set election takes place which types of nodes can participate

71. What term is use to describe the order that a database stores documents on disk?

72. You want to minus one to field foo, what should you use?

73. In MongoDB's Geospatial Indexing, if you want to create & use index on EARTH, what is NOT TRUE?

74. You cannot use characters among /\. "*<>:|? in database names, in release version

75. A property used to address servers based on their real-world locations is called:

76. MongoDB queries return a limited size (or "threshold") of results by default, usually:

77. What is the minimum number of mongod instances that may make up a replica set?

78. Haystack Indexes are typically used to:

79. By default, MongoDB allows up to _____ collections.

80. Suppose you have a collection foo with an index created using the statement db.foo.ensureIndex({a:1, b:-1, c:1}). Which of the following queries could use the index

81. Asume a users collections with the following fields: "_id", "username", "password", "email". At least one of the users has registered all of the fields. If you run both this queries: 1) db.users.find({}, {password: false, email: false}); 2) db.users.find({}, {_id: false, username: true}) Would the output be the same?

82. What is command specifying for database path ?

83.

Describe the output of the following mongo shell JavaScript: Object.keys(db.collection.findOne())

84.

Choose the best description for the query below db.foo.find({ $text:{ $search:

85. In a sharded replicas set environment with multiple mongos servers, which would decide the mongos failover?

86. What do you mean by sharding?

87. Choose the best commands to clone a collection to a sharded cluster from a developer machine.

88. Which is true about sharding?

89. _____ interface with client applications and direct operations to the appropriate shard or shards.

90. A query fails to return a complete result set on a sharded cluster. Choose the most probable reason

91. Which component exist in sharded cluster?

92. Regarding MongoDB sharding, choose the incorrect statement:

93. Which describe best the concept of Sharding in MongoDB ?

94. Why Sharding?

95. Why is sharding necessary?

96. Regarding MongoDB sharding, choose the correct statement:

97.

What is the difference between Sharding and Replication ?

98. Which operation will write the resulting documents of the aggregation pipeline to a collection in MongoDB?

99. Query shape consists of a combination of query, sort, and _____ specifications.

100.

In MongoDB, write operations are atomic at the (...........) level.