一番優秀なC100DBA資格準備一回合格-ハイパスレートのC100DBA参考資料

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MongoDB C100DBA Exam Syllabus Topics:

Section	Objectives
Topic 1: MongoDB CRUD Operations	- Insert, update, and delete operations - Working with documents and BSON types - Querying and filtering documents
Topic 2: Data Modeling	- Schema design principles - Embedding vs referencing - Relationships in MongoDB
Topic 3: Security	- Role-based access control (RBAC) - Encryption at rest and in transit - Authentication and authorization
Topic 4: Backup, Restore, and Operations	- Restore procedures - Monitoring and maintenance - Backup strategies and tools
Topic 5: Indexing and Performance Tuning	- Query performance optimization - Explain plans and diagnostics - Index types and usage
Topic 6: Aggregation Framework	- Data transformation and grouping - Aggregation operators - Aggregation pipeline stages
Topic 7: Replication and High Availability	- Failover and elections - Replica set architecture - Read/write concerns
Topic 8: Sharding and Scalability	- Shard keys and distribution strategy - Balancing and scaling operations - Sharded cluster architecture

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C100DBA試験の準備方法｜有効的なC100DBA資格準備試験｜信頼的なMongoDB Certified DBA Associate Exam (Based on MongoDB 4.4)参考資料

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) 認定 C100DBA 試験問題 (Q160-Q165):

質問 # 160
What is the on-premise solution having functionality equivalent to cloud manager?

A. Ops Manager
B. Service Manager
C. Replica Manager
D. Journaling

正解：A

質問 # 161
A database administrator maintains a MongoDB database that stores scientific papers. A paper with DOI
10.1000/xyz123 is no longer relevant and needs to be removed.
What query should the administrator use to delete the paper with the DOI equal to 10.1000/xyz123?

A. db.scientificPapers.drop({ doi: " 10.1000/xyz123 " })
B. db.scientificPapers.deleteOne({ scientificPapers: " orders " }, { doi: " 10.1000/xyz123 " })
C. db.scientificPapers.findOneAndDelete({ scientificPapers: " orders " , doi: " 10.1000/xyz123 " })
D. db.scientificPapers.deleteOne({ doi: " 10.1000/xyz123 " })

正解：D

解説：
db.collection.deleteOne() deletes a single document that matches the supplied filter, so the direct operation is db.scientificPapers.deleteOne({ doi: " 10.1000/xyz123 " }). The DOI is the identifying criterion, and no additional filter is required. Option A is dangerous and incorrect: drop() removes the entire collection and its indexes rather than deleting a filtered document. Option B uses findOneAndDelete(), which can delete a single matching document, but the displayed filter also requires a nonexistent or inappropriate field/value pair, scientificPapers: " orders " , so the target document would not match. Option D misunderstands the method signature. The second argument to deleteOne() is an options document for settings such as write concern, collation, or hint; it is not a second query predicate. In production, a unique index on DOI could also ensure that the business identifier is unique and make the deletion highly selective. Among the presented commands, only option C cleanly and correctly deletes the one scientific-paper document identified by the specified DOI.
Study Guide reference/topic:MongoDB Architecture and Core Operations - delete operations, deleteOne(), filters, and collection management.

質問 # 162
Consider an orders collection that contains these documents:
{ _id: 1, product: " X-pad " , quantity: 950 }
{ _id: 2, product: " X-pad-pro " , quantity: 1000 }
{ _id: 3, product: " X-phone " , quantity: 850 }
{ _id: 4, product: " X-phone-pro " , quantity: 1350 }
Commands A and B are run at the same time. Assume that no other operations are running.

A. )db.orders.updateMany({}, { $set: { " quantity " : 0 } })What is the possible findAndModify output and database state after these operations complete? Select TWO.
B. findAndModify output shows quantity 0; final quantities for all four documents are 0.
C. )db.orders.findAndModify({query: { " product " : " X-phone " },update: { $set: { " quantity " : 1250 }
}})
D. findAndModify output shows quantity 1250; final X-phone quantity is 1250 while all others are 0.
E. findAndModify output shows quantity 0; final X-phone quantity is 1250 while all others are 0.
F. findAndModify output shows quantity 850; final quantities for all four documents are 0.

正解：A、F

解説：
The result depends on how the two concurrent operations interleave at document _id:3. MongoDB guarantees atomicity for each individual document write, but updateMany() is not atomic across the complete set of matching documents. Other operations can run between its per-document modifications. findAndModify also returns the pre-modification version of the selected document by default unless configured to return the updated version. If findAndModify reaches the X-phone first, it observes quantity 850, returns that pre-image, and sets the value to 1250. The concurrent updateMany() can subsequently reach the same document and set it to 0, producing option B. In another valid interleaving, updateMany() first sets the X-phone quantity to 0.
findAndModify then selects that document, returns the pre-image showing 0, and sets the value to 1250.
Because updateMany() has already processed that document, the final value can remain 1250, producing option D. Options A and C do not correctly reflect the default pre-image return behavior together with the possible per-document interleavings. Therefore B and D are both valid outcomes.
Study Guide reference/topic:MongoDB Architecture and Core Operations - single-document atomicity, concurrent writes, findAndModify, and updateMany.

質問 # 163
'$set' sets the value of

A. Name/value pair
B. None of the above
C. Key
D. Code block

正解：C

質問 # 164
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":-l});
B. db.posts.createIndex({comments.$.author": {$desc:l>});
C. db.posts.createIndex({commerits.$.author":-l});

正解：A

質問 # 165
......

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C100DBA参考資料: https://www.jpexam.com/C100DBA_exam.html

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