[Dec 15, 2023] 100% Real & Accurate C100DBA Questions with Free and Fast Updates
Self-Study Guide for Becoming an MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Expert
MongoDB C100DBA certification exam is offered by MongoDB, a popular NoSQL database management system that is used by many organizations worldwide. C100DBA exam is designed to test the knowledge and skills of candidates in various areas of MongoDB database administration, including backup and recovery, security, performance tuning, and data modeling.
MongoDB C100DBA is a certification exam for MongoDB Certified DBA Associate. C100DBA exam is based on MongoDB 4.4, which is the latest version of MongoDB. C100DBA exam is designed to test the candidate's knowledge and skills in administering MongoDB deployments. C100DBA exam covers various topics such as MongoDB architecture, installation, configuration, security, backup and recovery, and performance optimization.
NEW QUESTION # 25
Below is a sample document of "orders" collection
Answer:
Explanation:
$project
NEW QUESTION # 26
Which of the following statements are true about the $match pipeline operator? Check all that apply.
- A. It has a sintax similar to findQ commands.
- B. It can be used as many time as needed.
- C. You should use it early as possible in the pipeline
Answer: A,B,C
NEW QUESTION # 27
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.
Answer:
Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )
NEW QUESTION # 28
Which command can be used to rebuild the indexes on a collection in MongoDB?
- A. db.collection.relndexQ
- B. db.collection.reIndex({author:l})
- C. db.collection.createlndex({relndex:l})
- D. db.collection.createIndex({author:l}).reIndex()
Answer: A
NEW QUESTION # 29
Consider that the posts collection contains an array called ratings which contains ratings given to the post by various users in the following format:
Which of the following query will return all the documents where the ratings array contains elements that in some combination satisfy the query conditions?
- A. db.inventory.find( { ratings: { ratings.$: { $gt: 5, $lt: 9 } } } )
- B. db.inventory.find( { ratings: { ratings: { $gt: 5, $lt: 9 } } } )
- C. db.inventory.find( { ratings: { $elemMatch: { $gte: 3, $lte: 6 } } } )
- D. db.inventory.find( { ratings: { $elemMatch: { $gt: 3, $lt: 6 }
Answer: B
NEW QUESTION # 30
Which is the default mode in which the explain() command runs?
- A. allPlansExecution
- B. executionStats
- C. queryPlanner
- D. customExecutionStats
Answer: C
NEW QUESTION # 31
What is the use of mongodump and mongorestore tools?
- A. replicate mongodb deployments
- B. performance tune mongodb deployment
- C. backup mongodb deployment
- D. audit mongodb deployment
Answer: C
NEW QUESTION # 32
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
Answer: A
NEW QUESTION # 33
Consider the following document:
> db.c.find()
{ "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }
Which of the following queries on the "c" collection will return only the first five elements of the array in the
"b"
field? E.g.,
Document you want returned by your query:
{ "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >
- A. db.c.find( { b : [ 0 , 5 ] > )
- B. db.c.find( { > , { b : [ 0 , 5 ] > )
- C. db.c.find( { > , { b : [ 0, 1, 2, 3, 4, 5 ] > )
- D. db.c.find( { > , { b : { $substr[ 0 , 5 ] > > )
- E. db.c.find( { > , { b : { $slice : [ 0 , 5 ] } } )
Answer: E
NEW QUESTION # 34
Which of the following operators is used to updated a document partially?
- A. $modify
- B. $project
- C. $update
- D. $set
Answer: D
NEW QUESTION # 35
In which of the following scenarios is sharding not the correct option. Select all that apply.
- A. The working set in the collection is expected to grow very large in size
- B. The write operations on the collection are low
- C. The write operations on the collection are very high
- D. The collection is a read intensive collection with less working set
Answer: B,D
NEW QUESTION # 36
You are in a sharded cluster. What will you do prior to initiating backup in sharded cluster?
- A. db.stopserver()
- B. sh.stopserverQ
- C. db.stopBalancer()
- D. sh.stopBalancer()
Answer: D
NEW QUESTION # 37
Which format/standard is used by MongoDB internally to store documents?
- A. B+ Trees
- B. BSON
- C. JSON
- D. JSON - Extended
Answer: C
NEW QUESTION # 38
Which of the following about Capped Collections is correct?
- A. Fixed Size
- B. If the allocated space for a capped collection exceeds, it stops inserting new documents
- C. High-throughput operations that insert and retrieve documents based on insertion order
- D. Only "Fixed Size" and "High-throughput operations that insert and retrieve documents based on insertion order"
Answer: D
NEW QUESTION # 39
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?
- A. db. posts.createIndex({^comments.author" :1});
- B. db.posts.createIndex({^commerits.author";-!});
- C. db.posts.createIndex({^comments.$.author":-l});
Answer: B
NEW QUESTION # 40
Below is a sample document in a given collection test.
{ a : 5, b : 3, c: 2, d : 1 >
Given a compound index { a: 1, b:l, c:l, d:l}, Which of the below query will not use in-memory sorting? Select all valid.
- A. db.test.find( { a: 5, b: 3 } ).sort( { a: 1} )
- B. db.test.find( { a: 5, b: 3 } ).sort( { c: 1, d : 1 } )
- C. db.test.find( { a: 5, b: 3 } ).sort( {c: 1 } )
- D. db.test.find( { a: 5, b: 3 } ).sort( { a: 1, b: 1, c: 1 > )
Answer: B,C
NEW QUESTION # 41
Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?
- A. To help in disaster recovery
- B. To add greather redundancy
- C. To enable certain read preference settings
- D. To protect agains network partitions
- E. For more efficient backup operations
Answer: D
NEW QUESTION # 42
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