[Oct-2022] Valid Way To Pass MongoDB Exam Dumps with C100DBA Exam Study Guide
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NEW QUESTION 45
Suposse tou have the following collection with only 2 documents:
If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: D
NEW QUESTION 46
Which of the following is true about sharding?
- A. A sharded environment does not support sorting functionality since the documents lie on various mongod instances
- B. We cannot change a shard key directly/automatically once it is set up
- C. Sharding is enabled at the database level
- D. Creating a sharded key automatically creates an index on the collection using that key
Answer: B
NEW QUESTION 47
MongoDB is
- A. Relational DBMS
- B. Document-oriented DBMS
- C. None of the above
- D. Object-oriented DBMS
Answer: B
NEW QUESTION 48
In a collection that contains 100 post documents, what does the following command do? db. posts.
find().skip(5).limit(5)
- A. Skips the first five documents and returns the next five
- B. Limits the first five documents and then return them in reverse order
- C. Skip and limit nullify each other. Hence returning the first five documents
- D. Skips the first five documents and returns the sixth document five times
Answer: A
NEW QUESTION 49
What is the use of mongodump and mongorestore tools?
- A. replicate mongodb deployments
- B. backup mongodb deployment
- C. audit mongodb deployment
- D. performance tune mongodb deployment
Answer: B
NEW QUESTION 50
Dada una coleccion, cuales devuelve con la siguiente query
db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});
- A. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >
- B. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u
"flipar" } - C. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" :
v u "flipar" } - D. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u
"flipar"}
Answer: A,C
NEW QUESTION 51
In a replicated cluster, which of the following node would only be used during an election?
- A. hidden
- B. secondary
- C. primary
- D. arbiter
Answer: D
NEW QUESTION 52
JSON stands for
- A. JavaScript Object Naming
- B. JavaScript Object Notice
- C. None of the above
- D. JavaScript Object Notation
Answer: D
NEW QUESTION 53
Which of the following are valid json documents? Select all that apply.
- A. {"city":"New York", "population", 7999034, boros:{"queens", "manhattan", "staten island", "the bronx", u "brooklyn"}}
- B. { }
- C. {"a":l, "b":{"b":l, "c":"foo", "d":"bar", "e":[l,2,4]}}
- D. {"name":"Fred Flintstone";"occupation":"Miner";"wife":"Wilma"}
Answer: B,C
NEW QUESTION 54
Which format/standard is used by MongoDB internally to store documents?
- A. JSON - Extended
- B. JSON
- C. B+ Trees
- D. BSON
Answer: B
NEW QUESTION 55
Which of the following command is used to get all the indexes on a collection?
- A. db.collection.showIndexes()
- B. db.collection.findlndexes()
- C. db.showIndexes()
- D. db.collection.getlndexesQ
Answer: D
NEW QUESTION 56
Which of the following is true of the mechanics of replication in MongoDB? Check all that apply.
- A. Clients read from the nearest member of a replica ser by default
- B. Operations on the primary are recorded in a capped collection called the oplog
- C. Members of a replica set may replicate data from any other data-bearing member of the set by default
Answer: B
NEW QUESTION 57
Mongodb does provide high availability via which option?
- A. Replication
- B. Indexing
- C. Sharding
- D. Journaling
Answer: A
NEW QUESTION 58
Which of the following statements are true about the $match pipeline operator? Check all that apply.
- A. It has a sintax similar to findQ commands.
- B. It can be used as many time as needed.
- C. You should use it early as possible in the pipeline
Answer: A,B,C
NEW QUESTION 59
Which of the following does MongoDB use to provide High Scalability?
- A. Indexing
- B. Sharding
- C. Write Concern
- D. Replication
Answer: B
NEW QUESTION 60
To add a new user and enable authentication in MongoDB, which of the following steps need be executed?
- A. update users collection and run db.enableAuthenticationQ
- B. update users collection and restart mongodb with -auth option
- C. update users collection and restart mongodb
- D. All of the above
Answer: B
NEW QUESTION 61
What is the output of the following program?
- A. 1s
- B. 100 ms
- C. 100 s
- D. 60 s
Answer: D
NEW QUESTION 62
What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden.
The set also has an arbiter?
- A. 0
- B. 1
- C. None of the above
- D. 2
Answer: D
NEW QUESTION 63
Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?
- A. aggregate
- B. mapReduce
- C. All of the above
- D. group
Answer: A
NEW QUESTION 64
Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?
- A. netLatency
- B. primaryPreferred
- C. secondaryPreferred
- D. nearest
Answer: D
NEW QUESTION 65
Aggregation Pipelines have a limit of:
- A. 16 MB document and 100 MB RAM
- B. No limit on document and 100 MB RAM
- C. 2 MB document and 100 MB RAM
- D. 2 MB document and no limit on RAM
Answer: A
NEW QUESTION 66
Which command is used to determine storage capacity of specific database?
- A. dbstats
- B. mongostat
- C. constats
- D. mongotop
Answer: A
NEW QUESTION 67
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply.
db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )
- A. { \Jd" :10,"a": 3, "c": 1, "b": 1}
- B. {".Jd" :6, "a": 1, "c" :1, "b" :5}
- C. {''__id" :3, "a": 4, "c" :0, "b" :14}
- D. {".Jd" :: 5, "a": 3, "c" :: 0, "b": 12}
- E. {".Jd" :: 4, "a": 5, "c" :: 0, "b": 17}
- F. {".Jd" :: 8, "a": 11, "c": 1, "b": 0}
- G. { ''\Jd" :9, "a": 17, "c": 1, "b": 1}
- H. {".Jd" :: 1, "a": 0, "c" :: 0, "b": 2}
- I. {''_Jd" :7, "a": 8, "c" :1, "b" :7}
- J. {".Jd" :: 2, "a": 2, "c" :: 0, "b": 1}
Answer: A,D,F,G,J
NEW QUESTION 68
By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?
- A. No limit, none
- B. 200, more
- C. 50, it
- D. 20, it
Answer: D
NEW QUESTION 69
Which option should be used to update all the documents with the specified condition in the MongoDB query?
- A. updateAII instead of update
- B. specify {all: true} as the third parameter of update command
- C. specify {updateAII: true} as the third parameter of update command
- D. specify {multi : true} as the third parameter of update command
Answer: D
NEW QUESTION 70
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