MongoDB 面试题与答案
问题 16. Explain the concept of covered queries in MongoDB.
Covered queries are queries where all the fields in the query are part of an index, and the index itself can fulfill the query requirements, avoiding the need to fetch data from the actual documents.
问题 17. How does MongoDB provide high availability?
MongoDB achieves high availability through replica sets, where data is replicated across multiple servers. If one server goes down, another can serve the data.
问题 18. What is the role of the WiredTiger storage engine in MongoDB?
WiredTiger is the default storage engine in MongoDB. It provides features like compression, document-level locking, and support for multiple storage engines in the same MongoDB deployment.
问题 19. What is the significance of the Journal in MongoDB?
The Journal in MongoDB is a write-ahead log that helps in recovering data in case of a server crash or failure. It ensures data durability and consistency.
问题 20. Explain the process of data migration in MongoDB.
Data migration in MongoDB involves transferring data from one database or collection to another. It can be done using tools like `mongodump` and `mongorestore`.
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