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MongoDB C100DBA Exam Syllabus Topics:

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

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q134-Q139):

NEW QUESTION # 134
In a replica set, which member is responsible for maintaining copies of the primary ' s data?

Answer: D

Explanation:
A replica-set secondary maintains a replicated copy of the primary ' s dataset. The primary records data- changing operations in its oplog, and secondary members continuously copy and apply those oplog entries asynchronously to keep their data synchronized. This redundancy allows an eligible secondary to participate in an election and potentially become primary if the current primary becomes unavailable. mongos, option B, is the query-routing process used in a sharded cluster; it does not store an application dataset copy. An arbiter, option C, participates in replica-set voting and elections but deliberately does not maintain a copy of the database data. A shard, option D, is a data partition in a sharded cluster and is normally implemented as a replica set in production, but "shard" is not the replica-set member role that replicates the primary ' s data.
Secondary behavior is central to MongoDB high availability, read-scaling options, backup strategies, and failover. Administrators monitor secondary replication lag and health to ensure the copies remain sufficiently current. Therefore the member responsible for maintaining copies of the primary ' s data is the secondary, making option A correct.
Study Guide reference/topic:Cluster Reliability and Data Resilience - replica-set primaries, secondaries, oplog replication, and redundancy.


NEW QUESTION # 135
Consider a collection posts which has fields: Jd, post_text, post_author, post_timestamp, post_tags etc. Which of the following query retrieves ONLY the key named post_text from the first document retrieved?

Answer: B


NEW QUESTION # 136
A MongoDB administrator needs to create a new role with only the read privileges for the products database.
What command should the administrator use?

Answer: A

Explanation:
MongoDB custom roles are defined in terms of privileges, and each privilege specifies a resource plus one or more allowed actions. For read/query access, find is a valid privilege action. To represent all normal collections in a specified database, MongoDB uses a resource document with the target database and an empty collection name, for example { db: " products " , collection: " " }. Option B therefore combines the correct resource scope with the find action and does not grant write capability. The distractors confuse built-in role names with privilege actions. read, readWrite, and readAnyDatabase are built-in roles or role concepts, not the appropriate action values for the privileges[].actions list shown here. Likewise, a literal " * " collection value is not the documented database-wide resource form for this custom privilege. In practice, an administrator could also assign MongoDB ' s built-in read role rather than creating a custom role if its permissions exactly match the requirement. Given the specific createRole() choices, however, option B is the technically correct construction.
Study Guide reference/topic:Security, Networking, and Encryption - RBAC, custom roles, resources, and privilege actions.


NEW QUESTION # 137
Which of the following is a valid insert statement in mongodb? Select all valid.

Answer: B,C


NEW QUESTION # 138
Which is the default mode in which the explain() command runs?

Answer: D


NEW QUESTION # 139
......

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