Quiz MongoDB - C100DBA - MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Perfect Reliable Guide Files

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MongoDB C100DBA Exam Syllabus Topics:

Section	Weight	Objectives
Replication and High Availability	15%	- Deployment and maintenance of replica sets - Replica set architecture and components - Failover, elections, read/write concern
Sharding and Scalability	10%	- Shard keys, chunk management, balancing - Sharded cluster architecture - Query routing and cluster operations
Monitoring, Performance and Troubleshooting	10%	- Monitoring tools and metrics - Diagnostics and resolving common issues - Performance tuning and optimization
CRUD Operations and Indexing	20%	- Query optimization and aggregation - Create, Read, Update, Delete operations - Index types, creation, and management
MongoDB Architecture and Deployment	20%	- Storage engines and server management - Core concepts, JSON/BSON, data model - Installation and configuration
Backup, Recovery and Maintenance	10%	- Restore procedures and disaster recovery - Logical and physical backup methods - Data consistency and integrity checks
Security and Access Control	15%	- Encryption, auditing, and security best practices - Authentication mechanisms - Role-based access control

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q107-Q112):

NEW QUESTION # 107
'mongoimport' command is used for

A. Multiple command insertion
B. Batch data insertion
C. Multiple command import
D. None of the above

Answer: B

NEW QUESTION # 108
Given the following MongoDB document in the users collection:
{ " userid " : 1, " first " : " John " , " roles " : " Basic " }
Which statement results in this document?
{ " userid " : 1, " first " : " John " , " roles " : " SuperUser " }

A. db.users.replaceOne({ userid: 1 }, { userid: 1, first: " John " , roles: " SuperUser " })
B. db.users.replaceOne({ userid: 1 }, { roles: " SuperUser " })
C. db.users.replaceOne({ userid: 1 }, { $set: { roles: " SuperUser " } })
D. db.users.replaceOne({ userid: 1 }, { first: " John " , roles: " SuperUser " })

Answer: A

Explanation:
replaceOne() replaces the matched document ' s content with the replacement document, except that the immutable _id value is preserved when it is not explicitly changed. Ordinary application fields that are omitted from the replacement disappear. The required final document must retain userid, retain first, and change roles to " SuperUser " . Option B supplies all three fields and therefore produces the requested document structure. Option A omits userid, so that ordinary field would be removed from the replacement.
Option C omits both userid and first, leaving only roles in addition to the preserved _id. Option D incorrectly uses the update operator $set inside a replacement document. $set belongs with update operations such as updateOne() or updateMany(); a replaceOne() replacement must be a replacement document rather than an update-operator document. This distinction is important for DBAs and application developers because accidental use of a partial replacement can delete fields that were intended to remain. If the goal is only to change one field, updateOne({userid:1}, {$set:{roles: " SuperUser " }}) would normally be safer. Given the choices, B is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - replaceOne(), full-document replacement, and update-versus-replacement semantics.

NEW QUESTION # 109
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 " :7, " a " : 8, " c " :1, " b " :7}
B. { " .Jd " :: 5, " a " : 3, " c " :: 0, " b " : 12}
C. { " .Jd " :6, " a " : 1, " c " :1, " b " :5}
D. { " .Jd " :: 2, " a " : 2, " c " :: 0, " b " : 1}
E. { " .Jd " :: 1, " a " : 0, " c " :: 0, " b " : 2}
F. { \Jd " :10, " a " : 3, " c " : 1, " b " : 1}
G. { ' ' __id " :3, " a " : 4, " c " :0, " b " :14}
H. { " .Jd " :: 4, " a " : 5, " c " :: 0, " b " : 17}
I. { ' ' \Jd " :9, " a " : 17, " c " : 1, " b " : 1}
J. { " .Jd " :: 8, " a " : 11, " c " : 1, " b " : 0}

Answer: B,D,F,I,J

NEW QUESTION # 110
Consider a contacts collection that contains these documents:
{ " _id " : 1, " name " : " Poppy " , " birthday " : " 03-09-1984 " }
{ " _id " : 2, " name " : " Ashley " , " birthday " : " 08-12-1990 " }
{ " _id " : 3, " name " : " Cleo " , " birthday " : " 11-02-1976 " }
What query returns the document where the field name is " Poppy " ?

A. db.contacts.find({ " Poppy " : 1 })
B. db.contacts.find({ " name " : " poppy " })
C. db.contacts.find({ " name " : " Poppy " })
D. db.contacts.find({ " name.Poppy " : 1 })

Answer: C

Explanation:
MongoDB equality filters use the form { field: value }. To return the document whose name field contains the exact string " Poppy " , the query therefore uses { name: " Poppy " }, as shown in option D. This shorthand equality syntax is equivalent to explicitly using $eq. Option B uses the correct field but the value is lowercase
" poppy " . Normal MongoDB string equality is case-sensitive unless a suitable collation or another case- insensitive technique is deliberately configured, so it does not match the displayed " Poppy " value. Option A uses name.Poppy as a dot-notation path. Dot notation is for accessing a nested field inside an embedded document, but here name stores a scalar string and has no nested Poppy field. Option C searches for a field literally named Poppy, which the sample documents do not contain. This question tests the basic field/value predicate syntax used by find(). The correct command is db.contacts.find({ " name " : " Poppy " }), making option D correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - find(), equality predicates, string matching, and dot notation.

NEW QUESTION # 111
Which of the following statements are true about the $match pipeline operator? Check all that apply.

A. You should use it early as possible in the pipeline
B. It can be used as many time as needed.
C. It has a sintax similar to findQ commands.

Answer: A,B,C

NEW QUESTION # 112
......

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