# 第四章 上下文写入与存储

上下文窗口是有限的，但应用往往需要处理的信息远超窗口容量。**写入策略** 解决的核心问题是：如何在上下文窗口之外持久化存储信息，并在需要时加载到上下文中？

本章会深入探讨外部记忆系统、多层次记忆架构、知识库构建方法，以及向量数据库的实践应用。这些是构建长期记忆和大规模知识管理系统的基础技术。

## 本章内容

* [4.1 外部存储与记忆系统](/context_engineering_guide/di-er-bu-fen-he-xin-ji-shu-yu-ce-le/04_write/4.1_external_storage.md)
* [4.2 记忆架构设计](/context_engineering_guide/di-er-bu-fen-he-xin-ji-shu-yu-ce-le/04_write/4.2_memory_architecture.md)
* [4.3 知识库构建与管理](/context_engineering_guide/di-er-bu-fen-he-xin-ji-shu-yu-ce-le/04_write/4.3_knowledge_base.md)
* [4.4 向量数据库实践](/context_engineering_guide/di-er-bu-fen-he-xin-ji-shu-yu-ce-le/04_write/4.4_vector_database.md)
* [本章小结](/context_engineering_guide/di-er-bu-fen-he-xin-ji-shu-yu-ce-le/04_write/summary.md)


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