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| Section | Objectives |
|---|---|
| Aggregation Framework | - Aggregation operators - Aggregation pipeline stages - Data transformation and grouping |
| Sharding and Scalability | - Balancing and scaling operations - Shard keys and distribution strategy - Sharded cluster architecture |
| Data Modeling | - Schema design principles - Relationships in MongoDB - Embedding vs referencing |
| Indexing and Performance Tuning | - Index types and usage - Query performance optimization - Explain plans and diagnostics |
| Backup, Restore, and Operations | - Restore procedures - Backup strategies and tools - Monitoring and maintenance |
| Security | - Role-based access control (RBAC) - Encryption at rest and in transit - Authentication and authorization |
| MongoDB CRUD Operations | - Working with documents and BSON types - Insert, update, and delete operations - Querying and filtering documents |
| Replication and High Availability | - Replica set architecture - Read/write concerns - Failover and elections |
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NEW QUESTION # 163
Dada una coleccion, cuales devuelve con la siguiente query
db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});
Answer: C,D
NEW QUESTION # 164
In what format does mongodump creates backup files?
Answer: D
NEW QUESTION # 165
Which node in a replica set does accept write operation?
Answer: D
NEW QUESTION # 166
In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal. What should be the value of j?
Answer: A
NEW QUESTION # 167
What command is used to check the value that " logLevel " is set to?
Answer: D
Explanation:
logLevel is a MongoDB server parameter, and server parameters are retrieved through the administrative getParameter database command. The documented and unambiguous mongosh form is db.adminCommand({ getParameter: 1, logLevel: 1 }), which executes the command against the admin database and requests the current value of logLevel. The first numeric value activates the command, while the logLevel field identifies the parameter to return. Options B and C refer to a db.getParameter() helper that is not the documented interface. Option A uses db.runCommand() without explicitly switching to the admin database. Because getParameter is an administrative command, db.adminCommand() is the correct and reliable form among the choices. Administrators use server parameters to inspect and, where supported, tune aspects of mongod or mongos behavior. logLevel controls global diagnostic verbosity, while component-specific verbosity can be managed through the logging configuration. For this question, option D precisely matches the expected administrative syntax. Checking the current value before changing logging settings is also a sound operational practice during troubleshooting.
Study Guide reference/topic:Performance Monitoring and Tuning - runtime server parameters, logging configuration, and getParameter.
NEW QUESTION # 168
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