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| Section | Weight | Objectives |
|---|---|---|
| MongoDB Architecture and Deployment | 20% | - Installation and configuration - Storage engines and server management - Core concepts, JSON/BSON, data model |
| CRUD Operations and Indexing | 20% | - Query optimization and aggregation - Create, Read, Update, Delete operations - Index types, creation, and management |
| Backup, Recovery and Maintenance | 10% | - Data consistency and integrity checks - Restore procedures and disaster recovery - Logical and physical backup methods |
| Monitoring, Performance and Troubleshooting | 10% | - Monitoring tools and metrics - Performance tuning and optimization - Diagnostics and resolving common issues |
| Sharding and Scalability | 10% | - Sharded cluster architecture - Query routing and cluster operations - Shard keys, chunk management, balancing |
| Security and Access Control | 15% | - Encryption, auditing, and security best practices - Role-based access control - Authentication mechanisms |
| Replication and High Availability | 15% | - Deployment and maintenance of replica sets - Replica set architecture and components - Failover, elections, read/write concern |
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NEW QUESTION # 91
Given the following query:
db.load.find({
_id: { $lte: 1000 },
rnd: 1234,
date: { $gte: ISODate( " 2023-01-01 " ) }
}).sort({ date: -1 })
In a compound index that best supports this query, what field should be first field?
Answer: B
Explanation:
The rnd field should lead the compound index because it is the query ' s equality predicate. MongoDB ' s common compound-index design rule is Equality, Sort, Range (ESR): fields tested for exact equality are typically placed first, followed by fields used for sorting and then range predicates, subject to workload- specific selectivity considerations. Here, rnd: 1234 is an equality condition. _id: { $lte: 1000 } is a range condition, and date: { $gte: ... } is also a range condition while the query additionally sorts on date. Leading with rnd sharply narrows the index region that must be scanned before MongoDB handles the sort/range dimensions. Starting with _id or date would place a range-oriented key ahead of the exact-match predicate and generally reduce the efficiency of index bounds for this query shape. The complete optimal key pattern may depend on whether avoiding the sort or maximizing range selectivity matters most, but the question asks only for the first field. Under ESR guidance, that first field is rnd, so option B is correct.
Study Guide reference/topic:Indexing and Query Optimization - compound indexes, selectivity, and the Equality-Sort-Range guideline.
NEW QUESTION # 92
Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?
Answer: D
NEW QUESTION # 93
What feature is one of the differences between using MongoDB and a relational database management system (RDBMS) database?
Answer: C
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 # 94
Which of the following is true about sharding?
Answer: C
NEW QUESTION # 95
Which of the following commands finds all the documents in the posts collection with post timestamp field as null?
Answer: D
NEW QUESTION # 96
......
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