MongoDB 面试题与答案
Test your skills through the online practice test: MongoDB Quiz Online Practice Test
问题 11. What is the role of the profiler in MongoDB?
The profiler is a MongoDB feature that tracks queries executed against the database. It helps in analyzing and optimizing query performance.
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问题 12. How do you perform aggregation in MongoDB?
MongoDB provides the `aggregate` method to perform aggregation operations, such as filtering, grouping, sorting, and projecting data.
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问题 13. Explain the GridFS in MongoDB.
GridFS is a specification for storing and retrieving large files in MongoDB. It divides a file into chunks and stores each chunk as a separate document.
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问题 14. What is the use of the `explain` method in MongoDB?
The `explain` method provides information on the query execution plan, helping in optimizing and understanding how a query is executed.
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问题 15. What is the TTL (Time To Live) index in MongoDB?
The TTL index is a special type of index that automatically deletes documents from a collection after a specified amount of time has passed.
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