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The MongoDB C100DBA Exam is designed to test the candidate's knowledge of MongoDB architecture, installation and configuration, security, performance tuning, backup and recovery, and monitoring and diagnostics. Candidates should have a solid understanding of these topics before attempting the exam. C100DBA exam consists of 60 multiple-choice questions that must be completed within 90 minutes.
MongoDB C100DBA certification is ideal for professionals who want to advance their careers in database administration. By earning this certification, candidates can demonstrate their proficiency in managing and maintaining MongoDB databases, which are widely used by modern applications due to their flexibility, scalability, and performance. Moreover, MongoDB certification is recognized by leading organizations in the industry, such as Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform (GCP), which can increase a candidate's employability and earning potential.
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To succeed in the MongoDB C100DBA Certification Exam, candidates need to have a deep understanding of MongoDB architecture and its related technologies. They should also be familiar with various tools and techniques used to monitor and manage MongoDB databases. Candidates need to demonstrate their ability to design, deploy, and maintain MongoDB databases in a production environment.
NEW QUESTION # 42
Which of the following is true about sharding?
Answer: A
NEW QUESTION # 43
What does the following aggregate query perform?
Answer: D
NEW QUESTION # 44
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 " }
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 # 45
What command will successfully start the mongod daemon with all default settings as a background task?
Answer: C
Explanation:
The --fork option starts mongod in daemon mode so the server process continues in the background. When -- fork is used, MongoDB requires diagnostic output to be redirected through a logging destination such as -- logpath or --syslog; the process cannot simply detach while continuing to use the normal foreground output stream. Option C supplies both --fork and a valid log path, while leaving the other server settings at their normal defaults unless they are configured elsewhere. Option A explicitly sets the default port but does not satisfy the logging requirement associated with --fork. Option B treats the literal word default as a filesystem path and does not provide the required log destination. Option D uses an unsupported --default switch. In production, MongoDB packages commonly use service managers such as systemd, and a configuration file is usually preferred over manually launching mongod with a long list of command-line options. Nevertheless, among the commands shown, C is the one that correctly daemonizes the server process and provides the logging configuration required for a successful fork.
Study Guide reference/topic:MongoDB Architecture and Core Operations - mongod startup, background execution, logging, and server configuration.
NEW QUESTION # 46
'mongoimport' command is used for
Answer: B
NEW QUESTION # 47
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