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| Certification Vendor: | MongoDB |
|---|---|
| Exam Name: | MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) |
| Exam Number: | C100DBA |
| Real Exam Qty: | 60-66 |
| Certificate Validity Period: | 3 years |
| Passing Score: | 65% |
| Exam Duration: | 90 minutes |
| Exam Format: | Multiple select, Multiple choice, Scenario-based questions |
| Related Certifications: | MongoDB Certified Developer Associate MongoDB Certified Professional DBA |
| Exam Price: | $150 USD |
| Available Languages: | English |
| Recommended Training: | M001: MongoDB Basics M201: MongoDB Performance M103: Basic Cluster Administration M310: MongoDB Security |
| 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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C100DBA認証試験は、MongoDBバージョン4.4の最新バージョンに基づいています。インストールと構成、パフォーマンスの最適化、セキュリティ、バックアップと回復、データモデリングなど、データベース管理に関連する幅広いトピックをカバーしています。この試験は、MongoDBデータベースを毎日扱う専門家のスキルと知識をテストするように設計されており、スムーズかつ効率的に実行されることを保証する責任があります。
MongoDB C100DBA認定試験は、MongoDBの最新バージョンであるMongoDB 4.4に基づいています。試験では、インストールと構成、データ管理、セキュリティ、パフォーマンスの最適化、バックアップと回復、監視とトラブルシューティングなど、MongoDBデータベース管理のさまざまな側面に関する候補者をテストします。
質問 # 130
A MongoDB database administrator is asked to add the privilege find to a role named myRole.
What is the correct syntax for adding this privilege to the role in MongoDB?
正解：D
解説：
The grantPrivilegesToRole command requires privileges to be an array of privilege documents. Each privilege document must contain a resource document and an actions array. Option A uses exactly that structure: the resource targets testDB with an empty collection name, which represents the database-level collection scope used by MongoDB ' s privilege model, and the actions list contains " find " . Option B omits the required resource wrapper and incorrectly places db and collection directly in the privilege document. Option C supplies privileges as a single document rather than as the required array. Option D has the correct resource structure but supplies actions as a scalar string instead of an array. The find action grants the ability to perform supported read operations on the specified resource scope, subject to the role ' s other inherited privileges. The shown writeConcern and comment fields are legitimate command options and do not change the structural requirement. Consequently, option A is the only choice that conforms to MongoDB ' s documented privilege document format.
Study Guide reference/topic:Security, Networking, and Encryption - user-defined roles, privilege documents, resources, actions, and grantPrivilegesToRole.
質問 # 131
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?
正解：B
解説：
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.
質問 # 132
Consider an inventory collection that contains these documents:
{ " _id " : 1, " product " : " x-small box " , " colors " : [ " brown " , " black " , " white " ], " qty " : 50 }
{ " _id " : 2, " product " : " small box " , " colors " : [ " brown " , " white " ], " qty " : 60 }
{ " _id " : 3, " product " : " medium box " , " colors " : [ " black " , " grey " , " white " ], " qty " : 45 }
{ " _id " : 4, " product " : " large box " , " colors " : [ " grey " ], " qty " : 50 }
{ " _id " : 5, " product " : " x-large box " , " colors " : [ " grey " , " white " ], " qty " : 10 } What result set does the following query return?
db.inventory.find({
$or: [
{ " product " : " x-small box " },
{
$and: [
{ " qty " : { $ne: 50 } },
{ " colors " : { $nin: [ " brown " ] } }
]
}
]
})
正解：C
解説：
The outer $or returns a document if either branch is true. Document 1 satisfies the first branch because product equals " x-small box " , so it is included regardless of the second branch. The nested $and requires both qty != 50 and the absence of " brown " from the colors array. Document 2 has quantity 60 but contains " brown " , so it fails $nin. Document 3 has quantity 45 and its colors do not include brown, so it satisfies both conditions. Document 4 has no brown but quantity is exactly 50, so it fails $ne: 50. Document 5 has quantity
10 and colors [ ' grey ' , ' white ' ], so it also satisfies both nested predicates. The final set is therefore documents 1, 3, and 5. This question also illustrates that MongoDB applies an implicit AND between multiple top-level field predicates in the same document, but here the explicit $and makes the required conjunction clear. Option D is the only answer containing exactly the matching documents.
Study Guide reference/topic:MongoDB Architecture and Core Operations - logical query operators, $or, $and,
$ne, and $nin.
質問 # 133
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?
正解：A
質問 # 134
'mongoimport' command is used for
正解：A
質問 # 135
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