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MongoDB C100DBA Exam Syllabus Topics:

SectionObjectives
Philosophy and Features- MongoDB Architecture
  • 1. Collections and Databases
  • 2. Document Model
  • 3. High Availability Concepts
  • 4. Scalability Concepts
Indexes- Index Management
  • 1. Compound Indexes
  • 2. Query Performance Optimization
  • 3. Index Selection
  • 4. Single Field Indexes
Application Administration- Security and Access Control
  • 1. Authentication
  • 2. Role-Based Access Control
  • 3. Authorization
  • 4. User Management
CRUD Operations- Data Manipulation
  • 1. Insert Operations
  • 2. Update Operations
  • 3. Delete Operations
  • 4. Read Queries
Server Administration- Database Operations
  • 1. Configuration Management
  • 2. Storage Management
  • 3. Backup and Restore
  • 4. Monitoring
Replication- Replica Sets
  • 1. Elections
  • 2. Primary and Secondary Nodes
  • 3. Write Concerns
  • 4. Read Preferences
Sharding- Cluster Scaling
  • 1. Query Routing
  • 2. Balancer Operations
  • 3. Chunk Distribution
  • 4. Shard Keys

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q150-Q155):

NEW QUESTION # 150
The________operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.

Answer: A


NEW QUESTION # 151
A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?

Answer: A


NEW QUESTION # 152
Consider a clothing collection that contains these documents:
{ " _id " : 1, " item " : " sweater " , " sizes " : [ " XS " , " S " ] }
{ " _id " : 2, " item " : " t-shirt " , " sizes " : [ " S " , " M " , " XL " ] }
{ " _id " : 3, " item " : " vest " , " sizes " : [ " M " , " L " , " XL " , " XXL " ] } What does the following query return?
db.clothing.find({ " sizes " : " M " })

Answer: D

Explanation:
MongoDB supports direct equality matching against elements contained in an array. When the predicate is { sizes: " M " } and sizes is an array field, a document matches when at least one element of the array equals the scalar value " M " . Document 1 contains only " XS " and " S " , so it does not match. Document 2 contains " M " in [ ' S ' , ' M ' , ' XL ' ], and document 3 contains " M " in [ ' M ' , ' L ' , ' XL ' , ' XXL ' ]; both therefore match. No $elemMatch expression is required for this simple scalar membership test. $elemMatch becomes important when multiple conditions must be satisfied by the same array element, particularly for arrays of embedded documents or compound conditions. This array equality behavior is a core part of MongoDB ' s document query model and allows concise filtering of array-valued fields. The correct result is consequently the t-shirt and vest documents, which corresponds to option D. This same matching behavior applies consistently whenever a scalar predicate targets values stored inside a BSON array field.
Study Guide reference/topic:MongoDB Architecture and Core Operations - querying array fields and equality predicates.


NEW QUESTION # 153
What mongosh command connects to node-1.cluster1.mycompany.local on port 27017?

Answer: B

Explanation:
mongosh accepts a MongoDB host address in hostname:port form, so mongosh " node-1.cluster1.mycompany.
local:27017 " is the valid choice among the commands shown. A canonical URI form such as mongosh " mongodb://node-1.cluster1.mycompany.local:27017 " is also valid, and the connection can alternatively be expressed using --host together with --port. Option A uses an unsupported --hostname switch rather than the documented --host option. Option B invents a --connect flag that is not the standard mongosh interface.
Option C constructs an invalid string using an ampersand-style parameter rather than a MongoDB URI or a normal host:port target. Port 27017 is MongoDB ' s default server port, so it could often be omitted if the deployment uses the default, but explicitly including it is valid and removes ambiguity. In authenticated or TLS-enabled environments, the DBA would also supply credentials, authentication database, certificate settings, or a connection string carrying those parameters. For the simple host-and-port requirement in the question, option D is correct.
Study Guide reference/topic:Security, Networking, and Encryption - mongosh connectivity, host/port addressing, and connection options.


NEW QUESTION # 154
You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?

Answer: C


NEW QUESTION # 155
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