良質なC100DBAのPDF問題集でC100DBA試験問題を試せます
一番最新のMongoDB C100DBA試験問題集PDF2023年更新
質問 63
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. None of the above
- C. 1
- D. 2
正解: A
質問 64
Which option should be used to update all the documents with the specified condition in the MongoDB query?
- A. specify {all: true} as the third parameter of update command
- B. specify {multi : true} as the third parameter of update command
- C. specify {updateAII: true} as the third parameter of update command
- D. updateAII instead of update
正解: B
質問 65
Which of the following is correct about MongoDB?
- A. MongoDB supports collection joins
- B. MongoDB supports some of the SQL functions
- C. MongoDB uses JSON format to represent documents
- D. MongoDB supports geospatial indexes
正解: D
質問 66
Which of the following statements are true about the $match pipeline operator? Check all that apply.
- A. It can be used as many time as needed.
- B. You should use it early as possible in the pipeline
- C. It has a sintax similar to findQ commands.
正解: A,B,C
質問 67
What does the totalKeysExamined field returned by the explain method indicate?
- A. Number of index entries scanned
- B. Details the completed execution of the winning plan as a tree of stages
- C. Number of documents that match the query condition
- D. Number of documents scanned
正解: A
質問 68
As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:
- A. MongoDB does not do any movements by default and will use the order provided
- B. $match moves before $sort
- C. Providing these parameters in any order does not impact the performance
- D. $sort moves before $match
正解: B
質問 69
What tool do you use if you want to extract a CSV from mongo?
正解:
解説:
mongoexport
質問 70
What is the on-premise solution having functionality equivalent to cloud manager?
- A. Replica Manager
- B. Service Manager
- C. Ops Manager
- D. Journaling
正解: C
質問 71
Which of the following is true about sharding?
- A. Sharding is enabled at the database level
- B. A sharded environment does not support sorting functionality since the documents lie on various mongod instances
- C. Creating a sharded key automatically creates an index on the collection using that key
- D. We cannot change a shard key directly/automatically once it is set up
正解: D
質問 72
What is the output of the following program?
- A. 60 s
- B. 100 s
- C. 100 ms
- D. 1s
正解: A
質問 73
Which of the following commands can cause the database to be locked?
- A. Issuing a query
- B. All of the above
- C. Map-reduce
- D. Inserting data
正解: B
質問 74
Consider the following document from the products collection:
What does the following query using $elemMatch return? db.products.find( { product_code: "345678" }, { variations: { $elemMatch: { size: ^L^ } } } )
- A. Returns the complete document but retrieves only the size field from the array
- B. Returns the complete document but retrieves only the size field from the array and also with only one element in the variations array (corresponding to size L)
- C. Returns the document but with only one element in the variations array (corresponding to size L)
- D. Returns the complete document since MongoDB does not support partial array retrieval
正解: C
質問 75
Which of the following collections stores authentication credentials in MongoDB?
- A. users.users
- B. local.users
- C. test.users
- D. system.users
正解: D
質問 76
Which mongodb tools allow us to work with our data in a human readable format?
- A. mongodump
- B. mongostat
- C. mongoexport
- D. mongoimport
正解: C,D
質問 77
Which of the following is a valid Replica Set configuration if you want:
1-Have 3 copies of everything
2- That RS3 is never primary
2- That RSI and RS2 can be primary?
You had to see the different configurations, RS3 could be hidden or priority 0 (But not a referee because we need
3 replicas), while RSI and RS2 could NOT have priority 0 or be hidden or anything like that In a 4-member RS RSO , RSI, RS2 and RS3 + Referee, RSO (primary) falls after some write operations that have replicated RSI and RS2 (but NOT RS3), who can get up as the new primary?
The configuration comes and in it we see that RS2 has a hidden: true (or a priority: 0, (I don't remember)
- A. RSO
- B. ORS2
- C. ORS1
- D. O arbiter
- E. ORS3
正解: C
質問 78
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?
- A. Replication
- B. Put indexes on all of your documents
- C. Properly defined user roles
- D. The proper storage engine
- E. Sharding
正解: A
質問 79
The MongoDB explain() method does not support which of the following verbosity mode:
- A. queryPlanner
- B. customExecutionStats
- C. allPlansExecution
- D. executionStats
正解: B
質問 80
In a replicated cluster, which of the following node would only be used during an election?
- A. secondary
- B. hidden
- C. arbiter
- D. primary
正解: C
質問 81
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