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| Section | Objectives |
|---|---|
| Indexing and Performance Tuning | - Index types and usage - Explain plans and diagnostics - Query performance optimization |
| Replication and High Availability | - Failover and elections - Replica set architecture - Read/write concerns |
| Sharding and Scalability | - Sharded cluster architecture - Shard keys and distribution strategy - Balancing and scaling operations |
| Aggregation Framework | - Data transformation and grouping - Aggregation pipeline stages - Aggregation operators |
| MongoDB CRUD Operations | - Insert, update, and delete operations - Querying and filtering documents - Working with documents and BSON types |
| Data Modeling | - Schema design principles - Relationships in MongoDB - Embedding vs referencing |
| Backup, Restore, and Operations | - Monitoring and maintenance - Backup strategies and tools - Restore procedures |
| Security | - Encryption at rest and in transit - Authentication and authorization - Role-based access control (RBAC) |
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NEW QUESTION # 73
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 # 74
Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?
Answer: C
NEW QUESTION # 75
Which format/standard is used by MongoDB internally to store documents?
Answer: C
NEW QUESTION # 76
Which of the following are valid json documents? Select all that apply.
Answer: C,D
NEW QUESTION # 77
What feature is one of the differences between using MongoDB and a relational database management system (RDBMS) database?
Answer: A
Explanation:
MongoDB ' s flexible document schema is a defining distinction from the conventional fixed-table model associated with relational database systems. Documents in the same MongoDB collection can contain different fields, nested structures, arrays, or representations when the application domain requires that flexibility. MongoDB can still enforce schema rules through validation, so a flexible schema does not mean the absence of governance; it means the physical model is not inherently restricted to one rigid row structure for every record. The other choices are not sufficiently distinguishing. Relational database platforms can provide replication, authentication, and horizontal partitioning or sharding techniques, so those capabilities are not unique architectural differences. MongoDB ' s BSON document model also allows data that is commonly normalized across multiple relational tables to be embedded within one application-oriented document where that design is appropriate. This can reduce joins and map more naturally to object structures used by applications. DBAs must still choose schemas carefully based on access patterns, document growth, duplication, and consistency requirements. Among the choices, Flexible Schema most accurately represents a fundamental MongoDB-versus-RDBMS difference, so option D is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - document databases, BSON data modeling, flexible schemas, and relational-model differences.
NEW QUESTION # 78
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