2024年01月05日に更新された最新のPassTest C100DBA試験問題リアルC100DBA問題集で
C100DBA別格な問題集で最上級の成績にさせるC100DBA問題
質問 # 24
Which of the following is correct about MongoDB?
- A. MongoDB supports some of the SQL functions
- B. MongoDB supports geospatial indexes
- C. MongoDB uses JSON format to represent documents
- D. MongoDB supports collection joins
正解：B
質問 # 25
Which of the following does MongoDB use to provide High Availability and fault tolerance?
- A. Indexing
- B. Sharding
- C. Write Concern
- D. Replication
正解：D
質問 # 26
Which mongodb tools allow us to work with our data in a human readable format?
- A. mongoimport
- B. mongoexport
- C. mongodump
- D. mongostat
正解：A、B
質問 # 27
In a replicated cluster, which of the following node would only be used during an election?
- A. hidden
- B. secondary
- C. primary
- D. arbiter
正解：D
質問 # 28
MongoDB is a schema-less design.
- A. False
- B. True
正解：B
質問 # 29
Which node in a replica set does accept write operation?
- A. hidden
- B. secondary
- C. arbiter
- D. primary
正解：D
質問 # 30
JSON stands for
- A. JavaScript Object Naming
- B. None of the above
- C. JavaScript Object Notation
- D. JavaScript Object Notice
正解：C
質問 # 31
Which are the ONLY ways to project portions of an array?
- A. $slice
- B. $
- C. $ elemMatch
- D. All of the above
正解：D
質問 # 32
Below is a sample document of "orders" collection
正解：
解説：
$project
質問 # 33
Which of the following does MongoDB use to provide High Scalability?
- A. Sharding
- B. Indexing
- C. Write Concern
- D. Replication
正解：A
質問 # 34
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
正解：B
質問 # 35
In mongodb how do you update a document partially?
- A. $project
- B. $modify
- C. $set
- D. $update
正解：C
質問 # 36
If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?
- A. The query used an index to fetch the results
- B. The query returned 30000 documents after scanning the documents
- C. The query returned 0 documents
- D. None of the above
正解：A
質問 # 37
You have designed a web application with mongoDB. You have configured replication. The replica set is in place and function properly. What happens in case of failure?
- A. Failover happens automatically
- B. Switchover happens automatically
- C. Failover needs to be done manually
- D. Switchover needs to be done manually
正解：A
質問 # 38
Aggregation Pipelines have a limit of:
- A. 2 MB document and no limit on RAM
- B. No limit on document and 100 MB RAM
- C. 2 MB document and 100 MB RAM
- D. 16 MB document and 100 MB RAM
正解：D
質問 # 39
Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply.
db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )
- A. { \Jd" :10,"a": 3, "c": 1, "b": 1}
- B. { ''\Jd" :9, "a": 17, "c": 1, "b": 1}
- C. {".Jd" :: 2, "a": 2, "c" :: 0, "b": 1}
- D. {".Jd" :: 1, "a": 0, "c" :: 0, "b": 2}
- E. {".Jd" :: 8, "a": 11, "c": 1, "b": 0}
- F. {''_Jd" :7, "a": 8, "c" :1, "b" :7}
- G. {''__id" :3, "a": 4, "c" :0, "b" :14}
- H. {".Jd" :6, "a": 1, "c" :1, "b" :5}
- I. {".Jd" :: 5, "a": 3, "c" :: 0, "b": 12}
- J. {".Jd" :: 4, "a": 5, "c" :: 0, "b": 17}
正解：A、B、C、E、I
質問 # 40
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
正解：D
質問 # 41
Addding the index {a:l} can potentially decrease the speed of which of the following operations? Check all that apply.
- A. db.collection.find( {a : 232} )
- B. db.collection.update({b:456>, {$inc: {a:l> })
- C. db.collection.insert( { a:341})
正解：B、C
質問 # 42
Which operations add new documents to a collection?
- A. update
- B. Create
- C. insert
- D. delete
正解：B、C
質問 # 43
What does the totalKeysExamined field returned by the explain method indicate?
- A. Details the completed execution of the winning plan as a tree of stages
- B. Number of documents that match the query condition
- C. Number of documents scanned
- D. Number of index entries scanned
正解：D
質問 # 44
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