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| Section | Objectives |
|---|---|
| Topic 1: Indexing and Performance Tuning | - Explain plans and diagnostics - Index types and usage - Query performance optimization |
| Topic 2: Security | - Role-based access control (RBAC) - Authentication and authorization - Encryption at rest and in transit |
| Topic 3: Replication and High Availability | - Failover and elections - Replica set architecture - Read/write concerns |
| Topic 4: Data Modeling | - Relationships in MongoDB - Schema design principles - Embedding vs referencing |
| Topic 5: Backup, Restore, and Operations | - Backup strategies and tools - Monitoring and maintenance - Restore procedures |
| Topic 6: Sharding and Scalability | - Balancing and scaling operations - Shard keys and distribution strategy - Sharded cluster architecture |
| Topic 7: Aggregation Framework | - Aggregation operators - Aggregation pipeline stages - Data transformation and grouping |
| Topic 8: MongoDB CRUD Operations | - Insert, update, and delete operations - Querying and filtering documents - Working with documents and BSON types |
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NEW QUESTION # 162
You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?
Answer: B
NEW QUESTION # 163
What command lists all indexes for a collection?
Answer: C
Explanation:
db.collection.getIndexes() is the mongosh method used to return the definitions of all indexes that currently exist on a collection. The result is an array of index specification documents that can show fields such as the index name, key pattern, index version, uniqueness, partial-filter settings, sparse configuration, collation, and whether the index is hidden. This makes the method useful for index audits, troubleshooting, and confirming the physical indexes available to the query planner. Option A is not a documented method for enumerating collection indexes. Option B resembles the $indexStats aggregation stage, which reports usage statistics for indexes, but db.collection.indexStats() is not the method used to list full index definitions. Option C, findIndexes(), is also not the documented mongosh collection helper. Administrators should distinguish between listing index definitions, examining index usage, and inspecting an individual query ' s winning plan:
getIndexes() addresses the first requirement, $indexStats addresses usage metrics, and explain() addresses query-planner behavior. Therefore option D is the correct command for listing all indexes on the collection.
Study Guide reference/topic:Indexing and Query Optimization - index administration, index metadata, and db.
collection.getIndexes().
NEW QUESTION # 164
Consider that the posts collection contains an array called ratings which contains ratings given to the post by various users in the following format:
Which of the following query will return all the documents where the ratings array contains elements that in some combination satisfy the query conditions?
Answer: B
NEW QUESTION # 165
Below is a sample document of "orders" collection
Answer:
Explanation:
$project
NEW QUESTION # 166
Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});
Answer: A,D
NEW QUESTION # 167
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