ainfoera.com – MCQs, Mock Tests | MongoDB MongoDB Mcq Question Set 19

1 Instead of Primary Key mongoDB use?

A Embedded Documents B Default key _id C mongod D mongofiles

✅ Correct Answer: 2

2 How to create index in mongoDB?

A index() B createIndex() C putIndex() D getIndex()

✅ Correct Answer: 2

3 Which of the following iis correct syntax of createindex?

A db.COLLECTION_NAME.createIndex({KEY:1}) B COLLECTION_NAME.createIndex({KEY:1}) C db.COLLECTION_NAME.createIndex D db.createIndex({KEY:1})

✅ Correct Answer: 1

4 To create index in descending order, the value of key is?

A 1 B 0 C -1 D infinite

✅ Correct Answer: 3

5 The default value of background Parameter is :

A TRUE B FALSE C 0 D 1

✅ Correct Answer: 2

6 The default value of default_language Parameter is :

A Mongo B DB C Mongod D English

✅ Correct Answer: 4

7 Which method deletes multiple (specified) indexes on a collection?

A dropIndexes() B dropIndex() C Both A and B can be used D getIndexes()

✅ Correct Answer: 1

8 Which method returns the description of all the indexes int the collection?

A putIndexes() B setIndexes() C getIndexes() D All of the above

✅ Correct Answer: 3

9 The maximum value of weights parameter is:

A 999 B 9999 C 99999 D 99

✅ Correct Answer: 3

10 What is the type of sparse parameter in createIndex()?

A Boolean B string C integer D Documentation

✅ Correct Answer: 1

11 What is the type of weights parameter in createIndex()?

A Boolean B string C integer D Document

✅ Correct Answer: 4

12 The basic syntax of Aggregation is?

A db.COLLECTION_NAME.aggregate ({key:1}) B db.COLLECTION_NAME.aggregation (AGGREGATE_OPERATION) C db.COLLECTION_NAME.aggregate (AGGREGATE_OPERATION) D aggregate (AGGREGATE_OPERATION)

✅ Correct Answer: 3

13 Which of th following expression is used to calculates the average of all given values from all documents in the collection?

A $sum B $avg C $min D $maximum

✅ Correct Answer: 2

14 Which of th following expression is used to gets the maximum of the corresponding values from all documents in the collection?

A $sum B $push C $min D $max

✅ Correct Answer: 4

15 Which of th following expression is used to Inserts the value to an array in the resulting document?

A $addToSet B $first C $push D $last

✅ Correct Answer: 3

16 Which of th following expression is used to gets the first document from the source documents according to the grouping?

A $addToSet B $first C $push D $last

✅ Correct Answer: 2

17 Which stages in aggregation framework Used to select some specific fields from a collection?

A $project B $group C $limit D $unwind

✅ Correct Answer: 1

18 What is true about $unwind stages in aggregation framework ?

A It is used to unwind document that are using arrays. B When using an array, the data is kind of pre-joined and this operation will be undone with this to have individual documents again. C This stage we will increase the amount of documents for the next stage. D All of the above

✅ Correct Answer: 4

19 What is true about $group stages in aggregation framework ?

A This is a filtering operation and thus this can reduce the amount of documents that are given as input to the next stage. B This does the actual aggregation C Sorts the documents D none of the above

✅ Correct Answer: 2

20 What is true about $skip stages in aggregation framework ?

A This is a filtering operation and thus this can reduce the amount of documents that are given as input to the next stage. B This limits the amount of documents to look at, by the given number starting from the current positions. C With this, it is possible to skip forward in the list of documents for a given amount of documents. D none of the above

✅ Correct Answer: 3

21 Which stages in aggregation framework is a filtering operation and thus this can reduce the amount of documents that are given as input to the next stage?

A $limit B $match C Both A and B can be used D none of the above

✅ Correct Answer: 2

22 What is true about Replication?

A Replication is the process of synchronizing data across multiple servers. B Replication provides redundancy and increases data availability with multiple copies of data on different database servers. C Replication protects a database from the loss of a single server. D All of the above

✅ Correct Answer: 4

23 Replication is not used for?

A keep your data safe B Low availability of data C Disaster recovery D Read scaling

✅ Correct Answer: 2

24 Replica set is transparent to the application.

A TRUE B FALSE C Can be true or false D Can not say

✅ Correct Answer: 1

25 A replica set is a group of ___________ instances that host the same data set.

A cluster B failover C mongod D Consensus

✅ Correct Answer: 3

26 In a replica, one node is primary node that receives?

A all write operations B all read operations C all read and write operation D None of the above

✅ Correct Answer: 2

27 Which of the following is not a Replica Set Features?

A Automatic failover B Automatic recovery C Consensus election of primary D A cluster of only one nodes

✅ Correct Answer: 4

28 In MongoDB client, how to initiate a new replica set?

A rs.initiate() B rs.conf() C rs.status() D none of the above

✅ Correct Answer: 1

29 To check the replica set configuration, issue the command rs.conf().

A TRUE B FALSE C Can be true or false D Can not say

✅ Correct Answer: 1

30 Which of the following is correct syntax to Add Members to Replica Set?

A db.add(HOST_NAME:PORT) B rs.add(HOST_NAME:PORT) C rs.isMaster(HOST_NAME:PORT) D db.isMaster(HOST_NAME:PORT)

✅ Correct Answer: 2

31 To check whether you are connected to primary or not, issue the command db.Master() in mongo client.

A TRUE B FALSE C Can be true or false D Can not say

✅ Correct Answer: 2

32 ______ is the process of storing data records across multiple machines and it is MongoDB's approach to meeting the demands of data growth

A Sharding B Config Servers C Query Routers D Projection

✅ Correct Answer: 1

33 Single replica set has limitation of?

A 10 Nodes B 12 Nodes C 8 Nodes D Infinite Nodes

✅ Correct Answer: 2

34 Which of the following is true about why to use Sharding?

A In replication, all writes go to master node B Memory can't be large enough when active dataset is big C Vertical scaling is too expensive D All of the above

✅ Correct Answer: 4

35 In production enviroment , how many sharded clusters have?

A 2 B 3 C 4 D 5

✅ Correct Answer: 2

36 What is true about Query Routers?

A Query routers are basically mongo instances, interface with client applications and direct operations to the appropriate shard. B The query router processes and targets the operations to shards and then returns results to the clients. C A sharded cluster can contain more than one query router to divide the client request load. D All of the above

✅ Correct Answer: 4

37 Point out the correct statement

A High query rates can exhaust the CPU capacity of the server B Database systems with small data sets and high throughput applications can challenge the capacity of a single server C Smaller data sets exceed the storage capacity of a single machine D none of the above

✅ Correct Answer: 1

38 _______ scaling adds more CPU and storage resources to increase capacity.

A Horizontal B Vertical C Partition D All of the above

✅ Correct Answer: 2

39 Each shard stores ________ data as the cluster grows.

A less B more C equal D Can not say

✅ Correct Answer: 1

40 Which command returns a document that provides an overview of the database process's state?

A serverStatus B currentQueue C currentQu D clientStatus

✅ Correct Answer: 1

41 Which of the following setting defines what constitutes a "slow" operation?

A fastOpThresholdMs B slowOpThresholdZs C slowOpThresholdMs D slowOpThresholdGs

✅ Correct Answer: 3

42 _____ returns the queryPlanner information for the evaluated method.

A db.explain() B db.collection.explain() C collection.explain() D explain()

✅ Correct Answer: 2

43 Point out the correct statement.

A For read-heavy applications, deploy sharding and add one or more shards to a sharded cluster to distribute load among mongod instances B Spikes in the number of available connections can also be the result of application or driver errors C For read-heavy applications, increase the size of your replica set and distribute read operations to secondary members D All of the above

✅ Correct Answer: 3

44 With which storage engine, MongoDB uses memory-mapped files to store data?

A MMAPv2 B MMAPv1 C WiredTiger D All of the above

✅ Correct Answer: 2

45 _____ returns the queryPlanner and executionStats information for the evaluated method.

A cursor.explain() B tablescan.explain() C server.explain() D client.explain()

✅ Correct Answer: 1

46 If MongoDB can use an index scan to obtain the requested sort order, the result will not include a SORT stage

A TRUE B FALSE C Can be true or false D Can not say

✅ Correct Answer: 2

47 In MongoDB, At which level write operations are atomic?

A Collection B Document C Field D RowSet Interface

✅ Correct Answer: 2

48 The limit on the number of namespaces depend on the ?

A <database>.ns size B <document>.ns size C <field>.ns size D . <row>.ns size

✅ Correct Answer: 1

49 The namespace file defaults to ?

A 4 MB B 8 MB C 16 MB D 32 MB

✅ Correct Answer: 3

50 _____index allows efficient retrieval of chunks using the files_id and n values.

A repairDatabase B dataFS C fileFS D GridFS

✅ Correct Answer: 4

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MongoDB Mcq Question Set 19