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| Certification Vendor: | MongoDB |
|---|---|
| Exam Name: | MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) |
| Exam Number: | C100DBA |
| Passing Score: | 65% |
| Related Certifications: | MongoDB Certified Developer Associate MongoDB Certified Professional DBA |
| Real Exam Qty: | 60-66 |
| Certificate Validity Period: | 3 years |
| Exam Format: | Multiple select, Multiple choice, Scenario-based questions |
| Exam Price: | $150 USD |
| Exam Duration: | 90 minutes |
| Available Languages: | English |
| Recommended Training: | M103: Basic Cluster Administration M001: MongoDB Basics M310: MongoDB Security M201: MongoDB Performance |
| Exam Registration: | MongoDB University Certification Portal |
| Sample Questions: | MongoDB C100DBA Sample Questions |
| Exam Way: | Online proctored exam, taken remotely via secure browser |
| Pre Condition: | No mandatory prerequisites; basic knowledge of MongoDB and database administration recommended |
| Official Syllabus URL: | https://learn.mongodb.com/pages/mongodb-associate-database-administrator-exam |
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Your preparation for this exam should include several activities each week. Manually created database. The MongoDB C100DBA company gives you its own study guide to prepare for this test, which includes the basic rules to follow, the topics to cover, and several examples of what can be asked in this exam. Multi and dispersed database. In order to clear this certification exam, you will have to learn all things about MongoDB, which is a great database management system. There is no specific time period in which the MongoDB C100DBA exam is to be held. View and edit any MongoDB object in your favorite programming language. Design Documents - Collection of documents that are related to your business-critical application and use MongoDB as well as any other database management system for this purpose. MongoDB C100DBA Dumps are created with the help of real exam questions. The C100DBA certification exam questions are given by the company on its site. CDB, Databases, Data models, Schemas, mongos, etc. BDB, MMAPV1, WiredTiger, etc. In order to clear this certification exam, you will have to learn all things about MongoDB, which is a great database management system.
Estate and Trust Record Management and Services. A large number of questions in the MongoDB C100DBA certification exam test is based on this document only. Hard and soft constraints. The C100DBA Certification Exam questions are given by the company on its site. Mongos, which is the primary command-line tool of MongoDB, is available only for Windows. Sharding, Replica Set, Authentication, Multiple command-line tools and tools for this purpose. Proper application of indexes will make your MongoDB C100DBA certification exam more interesting and the simpler. There is no set time period in which the MongoDB C100DBA exam is to be held. Automatically updated database. Products and services that relate to MongoDB and database management system. Administration of MongoDB and database management system. Products of plug-ins of MongoDB. Management plug-in of MongoDB.
Earning the MongoDB C100DBA certification validates your expertise in administering MongoDB databases and can help you advance your career as a database administrator or developer. C100DBA exam is based on MongoDB 4.4, the latest version of the database that introduces several new features and enhancements, including native time series support, distributed transactions, and improved security features. With the knowledge and skills gained through the C100DBA certification, candidates can become valuable assets to organizations that use MongoDB and contribute to their success.
NEW QUESTION # 62
Update If Correct is an approach for which of the following concepts in MongoDB:
Answer: B
NEW QUESTION # 63
By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?
Answer: D
NEW QUESTION # 64
A department store maintains a clothing collection:
{ " _id " : 1, " item " : " sweater " , " sizes " : [ " XS " , " S " , " L " ] }
{ " _id " : 2, " item " : " t-shirt " , " sizes " : [ " S " , " M " , " L " ] }
{ " _id " : 3, " item " : " vest " , " sizes " : [ " M " , " L " , " XL " , " XXL " ] } An employee runs:
db.clothing.find( { " sizes " : " M " } )
Which index should improve performance for this query the MOST?
Answer: C
Explanation:
The query filters only on the sizes field, so the most direct supporting index is a single-field index on sizes.
Because sizes contains arrays, MongoDB automatically treats the resulting index as a multikey index and creates index entries derived from the array elements. That allows the query { sizes: " M " } to locate matching documents through the index rather than scanning every document in the collection. Option B indexes item, which is not part of the predicate and therefore does not help this query. Option C contains sizes, but _id is the leading key and the query provides no equality restriction on _id; this prevents efficient use of the later key as a standalone prefix for the query. Option D has the same structural problem because item precedes sizes and is not constrained. MongoDB ' s index-prefix rules make a targeted { sizes: 1 } index the strongest choice here. In a real workload, DBAs should also consider write overhead and whether additional queries can share a compound index before creating redundant indexes. For this single query pattern, option A is optimal.
Study Guide reference/topic:Indexing and Query Optimization - multikey indexes, array fields, index prefixes, and query support.
NEW QUESTION # 65
What is the purpose of elections in a replica set?
Answer: A
Explanation:
Replica-set elections determine which eligible member serves as primary. An election can occur after the current primary becomes unavailable, after certain reconfigurations, during replica-set initialization, or when a primary is deliberately stepped down. Eligible voting members exchange election information and, when a candidate obtains the required support, that candidate transitions to primary and begins accepting writes.
Option A describes asynchronous replication through the oplog, which is a separate mechanism. Option C is unrelated: index creation is an administrative database operation, not a function of elections. Option D is also incorrect because elections do not add members to the replica-set configuration; adding a secondary requires an explicit membership change such as rs.add() or equivalent configuration management. Elections are the foundation of automatic failover and are one reason MongoDB replica sets can provide high availability without a human manually designating a replacement primary after every failure. During an election there can be a brief period in which writes are unavailable, so applications should use retryable behavior and appropriate driver topology handling. The purpose described in option B is therefore correct.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica-set elections, primary selection, voting, and automatic failover.
NEW QUESTION # 66
What command set removes node-1.cluster1.mycompany.local:27017 and node-2.cluster1.mycompany.local:
27017 from the replica set, then adds node-1.cluster1.mycompany.local:27017 back to the replica set?
Answer: B
Explanation:
The supported mongosh helpers for replica-set membership changes are rs.remove() and rs.add(). rs.remove (hostname) removes the member whose host string matches the supplied host:port, while rs.add() adds a new member using either a host string or a member configuration document that includes a host field. Option C uses those documented methods in the required sequence: remove node 1, remove node 2, then add node 1 back. The names rs.removeNode() and rs.addNode() shown in the other options are not standard MongoDB replica-set helper methods. Membership changes must be performed carefully because modifying voting or data-bearing membership can affect majority calculations, elections, and availability. Administrators normally execute membership changes while connected to the current primary, allow configuration propagation, and verify replica-set health afterward with rs.status() or related diagnostics. If a removed data-bearing node is later re-added, it may need to synchronize depending on how far its data has diverged from the current replica- set history. Among the choices, option C is the only valid command sequence.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica-set membership, rs.remove(), rs.
add(), and topology changes.
NEW QUESTION # 67
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