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mysql01.html
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</head><body><div id="web_bg" style="background-image: url(/img/48036836_p0.jpg);"></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img is-center"><img src="/img/SekiBetu.png" onerror="onerror=null;src='/img/Starfetcher.jpg'" alt="avatar"/></div><div class="site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">16</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">25</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">0</div></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div></div></div></div><div class="post" id="body-wrap"><header class="post-bg" id="page-header" style="background-image: url(/img/67861832_p0.jpg);"><nav id="nav"><span id="blog-info"><a class="nav-site-title" href="/"><span class="site-name">惜别的秘密基地</span></a><a class="nav-page-title" href="/"><span class="site-name">MySQL事物隔离级别笔记</span></a></span><div id="menus"><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> 时间轴</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> 标签</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> 友链</span></a></div></div><div id="toggle-menu"><span class="site-page"><i class="fas fa-bars fa-fw"></i></span></div></div></nav><div id="post-info"><h1 class="post-title">MySQL事物隔离级别笔记</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-07-18T06:11:17.000Z" title="发表于 2020-07-18 14:11:17">2020-07-18</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-06-17T13:31:56.000Z" title="更新于 2022-06-17 21:31:56">2022-06-17</time></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">总字数:</span><span class="word-count">274</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>1分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title=""><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">浏览量:</span><span id="busuanzi_value_page_pv"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><table>
<thead>
<tr>
<th style="text-align:center">隔离级别</th>
<th style="text-align:center">脏读（Dirty Read）</th>
<th style="text-align:center">不可重复读（NonRepeatable Read）</th>
<th style="text-align:center">幻读（Phantom Read）</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">未提交读（Read uncommitted）</td>
<td style="text-align:center">yes</td>
<td style="text-align:center">yes</td>
<td style="text-align:center">yes</td>
</tr>
<tr>
<td style="text-align:center">已提交读（Read committed）</td>
<td style="text-align:center">no</td>
<td style="text-align:center">yes</td>
<td style="text-align:center">yes</td>
</tr>
<tr>
<td style="text-align:center">可重复读（Repeatable read）</td>
<td style="text-align:center">no</td>
<td style="text-align:center">no</td>
<td style="text-align:center">yes</td>
</tr>
<tr>
<td style="text-align:center">可串行化（Serializable ）</td>
<td style="text-align:center">no</td>
<td style="text-align:center">no</td>
<td style="text-align:center">no</td>
</tr>
</tbody>
</table>
<ul>
<li>
<p>未提交读(Read uncommitted)：能读取到别的事务未提交的数据</p>
</li>
<li>
<p>已提交读(Read committed)：只能读取到别的事务已经提交的数据</p>
</li>
<li>
<p>可重复读(Repeatable)：在读取数据后直接加锁，其他事务无法修改和删除这些数据，但是防不住 insert 的新数据</p>
</li>
<li>
<p>可串行化(Serializable)：读取用读取锁，写入用写入锁，这两个锁互斥，这样能保证数据绝对安全，但是性能低下</p>
</li>
<li>
<p>脏读(Dirty Read)：可以读取到未提交的数据</p>
</li>
<li>
<p><strong>不可重复读(NonRepeatable Read)</strong>：在读取完数据后数据又修改并 commit 了，导致第二次读取的数据与第一次数据不一致(重点在修改数据)</p>
</li>
<li>
<p>幻读(Phantom Read)：两次读取期间有新数据加入或者旧数据删除，导致不一致(重点在增删数据)</p>
</li>
</ul>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta"><i class="fas fa-circle-user fa-fw"></i>文章作者: </span><span class="post-copyright-info"><a href="https://sekibetu.com">SekiBetu</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta"><i class="fas fa-square-arrow-up-right fa-fw"></i>文章链接: </span><span class="post-copyright-info"><a href="https://sekibetu.com/mysql01.html">https://sekibetu.com/mysql01.html</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta"><i class="fas fa-circle-exclamation fa-fw"></i>版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来源 <a href="https://sekibetu.com" target="_blank">惜别的秘密基地</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" 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