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.存储引擎是MongoDB负责管理数据的主要组件。MongoDB提供了多种存储引擎，允许您选择最适合您应用程序的存储引擎。
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.日志是一种日志，可在发生硬关闭时帮助数据库恢复。有几个可配置的选项，允许日志在性能和可靠性之间取得平衡，适用于特定用例。
GridFS for Self-Managed Deployments is a versatile storage system that is suited to handling large files, such as those exceeding the 16 MB document size limit.自我管理部署的GridFS是一种多功能存储系统，适用于处理大型文件，例如超过16 MB文档大小限制的文件。