[2023年10月26日] C100DBA PDFで最近更新された問題です集試験点数を伸ばそう
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MongoDB C100DBA認定試験は、MongoDBデータベース管理の専門知識と知識を検証しようとする専門家にとって広く認識され、尊敬されている認定です。この試験は、インストールと構成、パフォーマンスの調整と最適化、セキュリティ、バックアップと回復、監視とメンテナンスなど、MongoDB 4.4データベース管理のさまざまな側面で候補者のスキルと能力をテストするように設計されています。
C100DBA試験としても知られるMongoDB認定DBAアソシエイト試験は、MongoDBデータベースの管理における個人のスキルと知識をテストする認定試験です。この試験は、人気のあるNOSQLデータベース管理システムの最新バージョンであるMongoDBバージョン4.4に基づいています。この試験は、生産環境でMongoDBデータベースの管理を担当する個人向けに設計されています。
質問 # 53
What does the following $slice query return using the following command? db.posts.find( {}, { comments: {
$slice: [ -10, 5 ] } } )
- A. Returns 5 comments, beginning with the last 10 items
- B. Returns 10 comments, beginning with the first
- C. Returns 10 comments, beginning with the last
- D. Returns 5 comments, beginning with the first 10 items
正解：A
質問 # 54
Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?
- A. {update: true, insert: true} as the third parameter of update command
- B. upsert command instead of update command
- C. This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query
- D. Specify {upsert : true } as the third parameter of update command
正解：D
質問 # 55
What tool do you use to see if you have a problem in the consumption of disk I / 0?
正解：
解説：
Mongoperf
質問 # 56
Which of the following about Capped Collections is correct?
- A. Only "Fixed Size" and "High-throughput operations that insert and retrieve documents based on insertion order"
- B. Fixed Size
- C. If the allocated space for a capped collection exceeds, it stops inserting new documents
- D. High-throughput operations that insert and retrieve documents based on insertion order
正解：A
質問 # 57
Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?
- A. To protect agains network partitions
- B. For more efficient backup operations
- C. To enable certain read preference settings
- D. To add greather redundancy
- E. To help in disaster recovery
正解：A
質問 # 58
What is the equivalent command in MongoDB for the following SQL query?
SELECT * FROM posts WHERE author like "%john%"
- A. db.posts.find( { $like: {author: /John/} } )
- B. db.posts.find( { author: /AjohnA/ > )
- C. db.posts.find( { author: /John/ } )
- D. db.posts.find( { author: {$like: /John/} } )
正解：C
質問 # 59
Which of the following collections stores authentication credentials in MongoDB?
- A. local.users
- B. users.users
- C. system.users
- D. test.users
正解：C
質問 # 60
Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?
- A. All of the above
- B. group
- C. aggregate
- D. mapReduce
正解：C
質問 # 61
Addding the index {a:l} can potentially decrease the speed of which of the following operations? Check all that apply.
- A. db.collection.insert( { a:341})
- B. db.collection.update({b:456>, {$inc: {a:l> })
- C. db.collection.find( {a : 232} )
正解：A、B
質問 # 62
Which of the following operator can be used to control the number of items of an array that a query returns?
- A. MongoDB does not support partial retrieval of items from an array
- B. $
- C. $ elemMatch
- D. $slice
正解：D
質問 # 63
Which of the following commands can cause the database to be locked?
- A. Map-reduce
- B. All of the above
- C. Inserting data
- D. Issuing a query
正解：B
質問 # 64
'$set' sets the value of
- A. None of the above
- B. Name/value pair
- C. Key
- D. Code block
正解：C
質問 # 65
Which of the following are valid json documents? Select all that apply.
- A. {"a":l, "b":{"b":l, "c":"foo", "d":"bar", "e":[l,2,4]}}
- B. {"name":"Fred Flintstone";"occupation":"Miner";"wife":"Wilma"}
- C. {"city":"New York", "population", 7999034, boros:{"queens", "manhattan", "staten island", "the bronx", u "brooklyn"}}
- D. { }
正解：A、D
質問 # 66
Which of the following operators is used to updated a document partially?
- A. $modify
- B. $set
- C. $project
- D. $update
正解：B
質問 # 67
Below is a sample document of "orders" collection
正解：
解説：
$sort
質問 # 68
If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?
- A. None of the above
- B. The query returned 0 documents
- C. The query used an index to fetch the results
- D. The query returned 30000 documents after scanning the documents
正解：C
質問 # 69
In a replicated cluster, which of the following node would only be used during an election?
- A. primary
- B. arbiter
- C. secondary
- D. hidden
正解：B
質問 # 70
Below is a sample document of "orders" collection
正解：
解説：
$project
質問 # 71
The MongoDB explain() method does not support which of the following verbosity mode:
- A. customExecutionStats
- B. allPlansExecution
- C. queryPlanner
- D. executionStats
正解：A
質問 # 72
Consider the following documents:
You perform the following query;
How many documents will be updated by the query?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
正解：E
質問 # 73
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