https://my-blog.j8465383071.workers.dev/categories/learning/Recent content in Learning on Kernel NotesHugo -- 0.147.7zh-cnFri, 11 Sep 2026 12:09:29 +0800https://my-blog.j8465383071.workers.dev/posts/database/g100%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/Fri, 11 Sep 2026 12:09:29 +0800https://my-blog.j8465383071.workers.dev/posts/database/g100%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B0/<h1 id="g100学习笔记">G100学习笔记</h1> <h2 id="1-page相关">1. page相关</h2> <h3 id="11-page的关键数据结构">1.1 page的关键数据结构</h3> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-c" data-lang="c"><span class="line"><span class="cl"><span class="k">typedef</span> <span class="k">struct</span> <span class="p">{</span> </span></span><span class="line"><span class="cl"> <span class="n">PageXLogRecPtr</span> <span class="n">pd_lsn</span><span class="p">;</span> <span class="cm">/* 当前页的最后一次修改对应的WAL记录的LSN */</span> </span></span><span class="line"><span class="cl"> <span class="n">uint16</span> <span class="n">pd_checksum</span><span class="p">;</span> <span class="cm">/* 当前页的checksum校验和，用来维护页面的完整性，使用特定的算法生成固定大小的值，在写入时计算，读取时校验，读取时计算checksum，与本记录比对 */</span> </span></span><span class="line"><span class="cl"> <span class="n">uint16</span> <span class="n">pd_flags</span><span class="p">;</span> <span class="cm">/* 页状态标志位 */</span> </span></span><span class="line"><span class="cl"> <span class="n">uint16</span> <span class="n">pd_lower</span><span class="p">;</span> <span class="cm">/* </span></span></span><span class="line"><span class="cl"><span class="cm">} </span></span></span></code></pre></div>