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md-icon"></span> 目录 </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#_1 class=md-nav__link> <span class=md-ellipsis> 课程简介 </span> </a> </li> <li class=md-nav__item> <a href=#_2 class=md-nav__link> <span class=md-ellipsis> 课程资源 </span> </a> </li> <li class=md-nav__item> <a href=#_3 class=md-nav__link> <span class=md-ellipsis> 资源汇总 </span> </a> </li> <li class=md-nav__item> <a href=#_4 class=md-nav__link> <span class=md-ellipsis> 后续课程 </span> </a> </li> </ul> </nav> </div> </div> </div> <div class=md-content data-md-component=content> <article class="md-content__inner md-typeset"> <h1 id=cmu-15-445-database-systems>CMU 15-445: Database Systems</h1> <h2 id=_1>课程简介</h2> <ul> <li>所属大学：CMU</li> <li>先修要求：C++，数据结构与算法，CMU 15-213 (A.K.A. CS:APP，这也是 CMU 内部对每年 Enroll 同学的先修要求)</li> <li>编程语言：C++</li> <li>课程难度：🌟🌟🌟🌟</li> <li>预计学时：100 小时</li> </ul> <p>作为 CMU 数据库的入门课，这门课由数据库领域的大牛 Andy Pavlo 讲授（“这个世界上我只在乎两件事，一是我的老婆，二就是数据库”）。</p> <p>这是一门质量极高，资源极齐全的 Database 入门课，这门课的 Faculty 和背后的 CMU Database Group 将课程对应的基础设施 (Autograder, Discord) 和课程资料 (Lectures, Notes, Homework) 完全开源，让每一个愿意学习数据库的同学都可以享受到几乎等同于 CMU 本校学生的课程体验。</p> <p>这门课的亮点在于 CMU Database Group 专门为此课开发了一个教学用的关系型数据库 <a href=https://github.com/cmu-db/bustub>bustub</a>，并要求你对这个数据库的组成部分进行修改，实现上述部件的功能。</p> <p>具体来说，在 15-445 中你需要在四个 Project 的推进中，实现一个面向磁盘的传统关系型数据库 Bustub 中的部分关键组件。</p> <p>包括 Buffer Pool Manager (内存管理), B Plus Tree (存储引擎), Query Executors &amp; Query Optimizer (算子们 &amp; 优化器), Concurrency Control (并发控制)，分别对应 <code>Project #1</code> 到 <code>Project #4</code>。</p> <p>值得一提的是，同学们在实现的过程中可以通过 <code>shell.cpp</code> 编译出 <code>bustub-shell</code> 来实时地观测自己实现部件的正确与否，正反馈非常足。</p> <p>此外 bustub 作为一个 C++ 编写的中小型项目涵盖了程序构建、代码规范、单元测试等众多要求，可以作为一个优秀的开源项目学习。</p> <h2 id=_2>课程资源</h2> <ul> <li>课程网站：<a href=https://15445.courses.cs.cmu.edu/fall2019/schedule.html>Fall 2019</a>, <a href=https://15445.courses.cs.cmu.edu/fall2020/schedule.html>Fall 2020</a>, <a href=https://15445.courses.cs.cmu.edu/fall2021/schedule.html>Fall 2021</a>, <a href=https://15445.courses.cs.cmu.edu/fall2022/schedule.html>Fall 2022</a>, <a href=https://15445.courses.cs.cmu.edu/spring2023/schedule.html>Spring 2023</a></li> <li>课程视频：课程网站免费观看, Fall 2022 的 <a href="https://www.youtube.com/playlist?list=PLSE8ODhjZXjaKScG3l0nuOiDTTqpfnWFf">Youtube 全开源 Lectures</a></li> <li>课程教材：Database System Concepts</li> <li>课程作业：5 个 Project 和 5 个 Homework</li> </ul> <p>在 Fall 2019 中，<code>Project #2</code> 是做哈希索引，<code>Project #4</code> 是做日志与恢复。</p> <p>在 Fall 2020 中，<code>Project #2</code> 是做 B 树，<code>Project #4</code> 是做并发控制。</p> <p>在 Fall 2021 中，<code>Project #1</code> 是做缓存池管理，<code>Project #2</code> 是做哈希索引，<code>Project #4</code> 是做并发控制。</p> <p>在 Fall 2022 中，与 Fall 2021 相比只有哈希索引换成了 B+ 树索引，其余都一样。</p> <p>在 Spring 2023 中，大体内容和 Fall 2022 一样（缓存池，B+ 树索引，算子，并发控制），只不过 <code>Project #0</code> 换成了 <code>Copy-On-Write Trie</code>，同时增加了很好玩的注册大小写函数的 Task，可以直接在编译出的 <code>bustub-shell</code> 中看到自己写的函数的实际效果，非常有成就感。</p> <p>值得注意的是，现在 bustub 在 2020 年以前的 version 都已经停止维护。</p> <p>Fall 2019 的最后一个 <code>Logging &amp; Recovery</code> 的 Project 已经 broken 了（在19年的 <code>git head</code> 上也许还可以跑，但尽管如此 Gradescope 应该也没有提供公共的版本，所以并不推荐大家去做，只看看代码和 Handout 就可以了）。</p> <p>或许在 Fall 2023 的版本 Recovery 相关的功能会被修复，届时也可能有全新的 <code>Recovery Project</code>，让我们试目以待吧🤪</p> <p>如果大家有精力的话可以都去尝试一下，或者在对书中内容理解不是很透彻的时候，尝试做一做对应的 Project 会加深你的理解（个人建议还是要全部做完，相信一定对你有帮助）。</p> <h2 id=_3>资源汇总</h2> <p>非官方的 <a href=https://discord.com/invite/YF7dMCg>Discord</a> 是一个很好的交流平台，过往的聊天记录几乎记载了其他同学踩过的坑，你也可以提出你的问题，或者帮忙解答别人的问题，相信这是一份很好的参考。</p> <p>关于 Spring 2023 的通关指南，可以参考 <a href=https://github.com/xzhseh>@xzhseh</a> 的这篇<a href=https://zhuanlan.zhihu.com/p/637960746>CMU 15-445/645 (Spring 2023) Database Systems 通关指北</a>，里面涵盖了全部你需要的通关道具，和通关方式建议，以及最重要的，我自己在做 Project 的过程中遇到的，看到的，和自己亲自踩过的坑。</p> <p>@ysj1173886760 在学习这门课中用到的所有资源和作业实现都汇总在 <a href=https://github.com/ysj1173886760/Learning/tree/master/db>ysj1173886760/Learning: db - GitHub</a> 中。</p> <p>由于 Andy 的要求，仓库中没有 Project 的实现，只有 Homework 的 Solution。特别的，对于 Homework1，@ysj1173886760 还写了一个 Shell 脚本来帮大家执行自动判分。</p> <p>另外在课程结束后，推荐阅读一篇论文 <a href=https://github.com/ysj1173886760/paper_notes/tree/master/db>Architecture Of a Database System</a>，对应的中文版也在上述仓库中。论文里综述了数据库系统的整体架构，让大家可以对数据库有一个更加全面的视野。</p> <h2 id=_4>后续课程</h2> <p><a href=https://15721.courses.cs.cmu.edu/spring2020/ >CMU15-721</a> 主要讲主存数据库有关的内容，每节课都有对应的 paper 要读，推荐给希望进阶数据库的小伙伴。@ysj1173886760 目前也在跟进这门课，完成后会在这里提 PR 以提供进阶的指导。</p> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title=最后更新> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1-2.1-2M12.5 7v5.2l4 2.4-1 1L11 13V7h1.5M11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2v1.8Z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">July 4, 2023</span> </span> </aside> </article> </div> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12Z"/></svg> 回到页面顶部 </button> </main> <footer class=md-footer> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright &copy; 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