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MongoDB C100DBA certification exam covers a wide range of topics, including database architecture, data modeling, query optimization, security, and scalability. It is a performance-based exam that evaluates your skills in real-world scenarios. C100DBA exam consists of 60 multiple-choice questions, and you have 90 minutes to complete it. C100DBA exam fee is $150, and you can take the exam online or at a testing center.
To prepare for the MongoDB C100DBA Exam, candidates are required to have a solid understanding of MongoDB architecture, data modeling, indexing, querying, replication, sharding, security, and performance tuning. They should also have hands-on experience with MongoDB, as well as familiarity with Linux/Unix command-line tools, network protocols, and database administration tools.
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MongoDB C100DBA Certification Exam is a timed exam that consists of 60 multiple-choice questions. C100DBA exam is designed to be completed in 90 minutes. To pass the exam, you need to score at least 65%. C100DBA exam is administered through a proctored online platform, which ensures the integrity of the exam. You can take the exam from anywhere in the world, as long as you have a reliable internet connection and a computer that meets the system requirements.
NEW QUESTION # 49
Which of the following is a valid insert statement in mongodb? Select all valid.
Answer: B,C
NEW QUESTION # 50
What is a limitation of encryption at rest?
Answer: A
Explanation:
Encryption at rest protects persisted database data on storage media, but it is not a complete defense against every form of data exposure or breach. MongoDB ' s encrypted storage capabilities protect files and storage- level data, yet applications and the database server must still process authorized data in usable form. A compromised application account, stolen database credentials, excessive privileges, or a malicious authorized user can therefore expose data even when the underlying storage is encrypted. Network traffic also requires separate transport protection such as TLS; encryption at rest does not secure data as it travels between clients and servers. Option B incorrectly describes transport encryption rather than an at-rest capability. Option A is too subjective and not an inherent limitation, particularly in managed deployments where storage encryption may be enabled automatically. Option D is similarly overstated; encryption adds cryptographic work, but severe performance impact is not an intrinsic defining limitation. The correct security model is defense in depth: combine at-rest encryption with TLS, strong authentication, least-privilege authorization, auditing, and secure key management. Among the choices, C best captures the limitation that at-rest encryption alone cannot prevent all data breaches.
Study Guide reference/topic:Security, Networking, and Encryption - encryption at rest, TLS, authorization, and defense in depth.
NEW QUESTION # 51
What command lists all indexes for a collection?
Answer: C
Explanation:
db.collection.getIndexes() is the mongosh method used to return the definitions of all indexes that currently exist on a collection. The result is an array of index specification documents that can show fields such as the index name, key pattern, index version, uniqueness, partial-filter settings, sparse configuration, collation, and whether the index is hidden. This makes the method useful for index audits, troubleshooting, and confirming the physical indexes available to the query planner. Option A is not a documented method for enumerating collection indexes. Option B resembles the $indexStats aggregation stage, which reports usage statistics for indexes, but db.collection.indexStats() is not the method used to list full index definitions. Option C, findIndexes(), is also not the documented mongosh collection helper. Administrators should distinguish between listing index definitions, examining index usage, and inspecting an individual query ' s winning plan:
getIndexes() addresses the first requirement, $indexStats addresses usage metrics, and explain() addresses query-planner behavior. Therefore option D is the correct command for listing all indexes on the collection.
Study Guide reference/topic:Indexing and Query Optimization - index administration, index metadata, and db.
collection.getIndexes().
NEW QUESTION # 52
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 # 53
Suposse tou have the following collection with only 2 documents:
If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?
Answer: A
NEW QUESTION # 54
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