Latest C100DBA Pass Guaranteed Exam Dumps with Accurate & Updated Questions
C100DBA Exam Brain Dumps - Study Notes and Theory
To pass the C100DBA exam, candidates need to have a deep understanding of MongoDB's architecture, replication, sharding, and backup and recovery processes. Additionally, candidates need to know how to manage users and roles, configure security, and troubleshoot issues related to MongoDB. C100DBA exam also covers topics such as indexing, performance tuning, and monitoring. MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) certification helps candidates demonstrate their expertise in MongoDB database administration and provides them with recognition and credibility in the industry.
NEW QUESTION # 31
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
Answer: D
NEW QUESTION # 32
Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?
- A. mapReduce
- B. aggregate
- C. All of the above
- D. group
Answer: B
NEW QUESTION # 33
The following aggregation option is used to specify the specific fields that needs to be passed to the next stage of the aggregation pipeline:
- A. $match
- B. $group
- C. $aggregate
- D. $project
Answer: D
NEW QUESTION # 34
In a sharded cluster, from which node does one stop the balancer process before initiating backup?
- A. mongos node
- B. Any node
- C. config server node
- D. replicaset primary node
Answer: A
NEW QUESTION # 35
Which operations add new documents to a collection?
- A. delete
- B. update
- C. Create
- D. insert
Answer: C,D
NEW QUESTION # 36
What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})
- A. Updates the Title of the post
- B. Syntax error
- C. Replaces the complete document with _id as 1 with the document specified in second parameter
- D. Updating a document is possible only with $set
Answer: C
NEW QUESTION # 37
Which of the following is incorrect statement about find and findOne operations in MongoDB?
- A. findQ and findOneQ returns cursors to the collection documents
- B. findQ returns all the documents in a collection while findOne() retrieves only the first one.
- C. find.limit(l) is not the same query as findOne()
- D. findOneQ returns the actual first document retrieved from a collection
Answer: A
NEW QUESTION # 38
Which of the following does MongoDB use to provide High Scalability?
- A. Sharding
- B. Indexing
- C. Write Concern
- D. Replication
Answer: A
NEW QUESTION # 39
To add a new user and enable authentication in MongoDB, which of the following steps need be executed?
- A. update users collection and restart mongodb with -auth option
- B. update users collection and restart mongodb
- C. All of the above
- D. update users collection and run db.enableAuthenticationQ
Answer: A
NEW QUESTION # 40
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.
Answer:
Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )
NEW QUESTION # 41
Given a replica set with five data-bearing members, suppose the primary goes down with operations in its oplog that have been copied from the primary to only one secondary. Assuming no other problems occur, which of the following describes what is most likely to happen?
- A. the primary may roll back the operations once it recovers
- B. the secondary with the most current oplog will be elected primary
- C. missing operations will need to be manually re-performed
- D. reads will be stale until the primary comes back up
- E. the most current secondary will roll back the operations following the election
Answer: B
NEW QUESTION # 42
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?
- A. Sharding
- B. Replication
- C. Put indexes on all of your documents
- D. Properly defined user roles
- E. The proper storage engine
Answer: B
NEW QUESTION # 43
What is the output of the following program?
- A. 100 s
- B. 1s
- C. 60 s
- D. 100 ms
Answer: C
NEW QUESTION # 44
In what format does mongodump creates backup files?
- A. SOAP
- B. JSON
- C. BSON
- D. XML
Answer: C
NEW QUESTION # 45
You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?
- A. An empty document
- B. A document that matches the collection's existing schema, but with null fields
- C. No document will be inserted; an error will be raised
- D. A document will be inserted with the same _id as the last document inserted
- E. A document with an _id assigned to be an Objectld
Answer: E
NEW QUESTION # 46
What tool would you use if you want to save a gif file in mongo?
Answer:
Explanation:
mongofile
NEW QUESTION # 47
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