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存储¶
The storage engine is the primary component of MongoDB responsible for managing data. MongoDB provides a variety of storage engines, allowing you to choose one most suited to your application.
The journal is a log that helps the database recover in the event of a hard shutdown. There are several configurable options that allows the journal to strike a balance between performance and reliability that works for your particular use case.
GridFS 是一个通用的存储系统用来处理大文件，例如那些超过16MB文档大小限制的文件。