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<article id="post-《java虚拟机实战》读书笔记" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2019/07/09/《java虚拟机实战》读书笔记/">《java虚拟机实战》读书笔记</a>
</h1>
<a href="/2019/07/09/《java虚拟机实战》读书笔记/" class="archive-article-date">
<time datetime="2019-07-09T08:25:25.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2019-07-09</time>
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<h1 id="《实战Java虚拟机》读书笔记"><a href="#《实战Java虚拟机》读书笔记" class="headerlink" title="《实战Java虚拟机》读书笔记"></a>《实战Java虚拟机》读书笔记</h1><p>本文为对《实战Java虚拟机》的心得总结，欢迎大家批评指正。</p>
<hr>
<h2 id="第二章-虚拟机的基本结构"><a href="#第二章-虚拟机的基本结构" class="headerlink" title="第二章 虚拟机的基本结构"></a>第二章 虚拟机的基本结构</h2><h3 id="Java虚拟机的基本组成"><a href="#Java虚拟机的基本组成" class="headerlink" title="Java虚拟机的基本组成"></a>Java虚拟机的基本组成</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p> <img src="/2019/07/09/《java虚拟机实战》读书笔记/1560401550610.png" alt="AA"></p>
<hr>
<ul>
<li><strong>类加载子系统</strong> </li>
</ul>
<p>类加载子系统负责从文件系统或者网络中加载Class信息，加载的信息存放在<strong><em>方法区</em></strong>的内存空间，方法的实例存放在<strong><em>Java堆</em></strong>当中。</p>
<ul>
<li><strong>方法区</strong> </li>
</ul>
<p>存放类加载子系统加载的方法，和运行时的常量池信息，包括字符串字面量和数字常量。</p>
<ul>
<li><strong>Java堆</strong></li>
</ul>
<p>几乎所有的Java对象的实例都存在放Java堆当中，由所有线程共享。</p>
<ul>
<li><strong>直接内存</strong></li>
</ul>
<p>Java的NIO库允许Java程序直接使用内存，速度比Java堆快。</p>
<ul>
<li><strong>垃圾回收系统</strong></li>
</ul>
<p>垃圾回收系统可以对<strong><em>方法区，Java堆，直接内存</em></strong>进行回收。</p>
<ul>
<li><strong>Java栈</strong></li>
</ul>
<p>每一个Java线程都有一个Java栈，在线程创建时被创建。Java栈当中保存着栈帧信息。Java栈与方法的调用、返回密切相关。</p>
<ul>
<li><strong>本地方法栈</strong></li>
</ul>
<p>本地方法栈与Java栈类似，不过Java栈完成的是Java方法的调用，而本地方法栈负责本地方法的调用、返回（通常由C语言编写）作为Java虚拟机的重要扩展。</p>
<ul>
<li><strong>程序计数器PC</strong></li>
</ul>
<p>每一个Java线程都有一个PC寄存器，每一个Java线程总是在执行一个方法，如果当前的方法是Java方法，那么PC寄存器的内容为方法对应的指令，如果是本地方法，那么是undefined.</p>
<hr>
<h3 id="Java堆初探"><a href="#Java堆初探" class="headerlink" title="Java堆初探"></a>Java堆初探</h3><p>一百来说，不同的垃圾回收机制下，Java堆的结构不尽相同，一种常见的结构是将整个Java堆分成<strong><em>新生代，老年代</em></strong>两种，新生代用于存放新生对象或者年龄不大的对象，分为<strong><em>eden区，s0区，s1区</em></strong> ，s0区s1区有时也被称为from区，to区。</p>
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<article id="post-《数据库系统概念》第六版-读书笔记" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2019/05/30/《数据库系统概念》第六版-读书笔记/">《数据库系统概念》第六版-读书笔记</a>
</h1>
<a href="/2019/05/30/《数据库系统概念》第六版-读书笔记/" class="archive-article-date">
<time datetime="2019-05-30T10:46:29.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2019-05-30</time>
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<p>本文是对该书的一个精炼和总结，如有错误烦请批评指正。</p>
<h1 id="第一章-引言"><a href="#第一章-引言" class="headerlink" title="第一章 引言"></a>第一章 引言</h1><p><strong>1.数据库管理系统（DBMS)</strong> 由一个相互关联的数据的集合和一组用于访问这些数据的程序组成。数据的集合常被称作为<strong>数据库</strong> 。</p>
<p><strong>2.数据抽象的级别</strong></p>
<ul>
<li>物理层： 最低层次的抽象，描述数据是怎样存储的，实现复杂的数据结构</li>
<li>逻辑层： 描述数据库中存储什么数据，以及这些数据之间的关系</li>
<li>视图层： 最高层次的抽象，只描述用户需要的数据库的某个部分</li>
</ul>
<p><strong>3.实例与模式</strong></p>
<ul>
<li>模式： 描述数据库的总体设计</li>
<li>实例： 描述在当前模式下，数据库的一个实体（信息的集合）</li>
</ul>
<p><strong>4.数据模型</strong>： 一个描述数据，数据联系，数据语义以及一致性约束的概念工具的集合。数据模型提供了一种<em>描述物理，逻辑，视图层数据库设计的方式</em>。</p>
<p>几种常见的数据模型</p>
<ul>
<li>关系模型： 用表的集合来表示数据以及数据之间的联系，是一种最常用的数据模型。</li>
<li>实体-联系模型（E-R）模型： 现实世界中由一组实体和之间的联系构成</li>
<li>基于对象的数据模型： 可以看作是一种E-R模型增加了封装、方法和对象标识。</li>
</ul>
<hr>
<h2 id="一、数据库语言"><a href="#一、数据库语言" class="headerlink" title="一、数据库语言"></a>一、数据库语言</h2><p>数据库语言由<strong>数据库定义语言</strong>和<strong>数据库操纵语言</strong>构成。</p>
<h3 id="数据库操纵语言（DML）"><a href="#数据库操纵语言（DML）" class="headerlink" title="数据库操纵语言（DML）"></a>数据库操纵语言（DML）</h3><p><strong>对实例进行操作。</strong>使得用户可以访问满足特定的规则的数据的语言。如对存储在数据库中的信息进行检索，插入、删除、修改数据。</p>
<h3 id="数据库定义语言（DDL）"><a href="#数据库定义语言（DDL）" class="headerlink" title="数据库定义语言（DDL）"></a>数据库定义语言（DDL）</h3><p><strong>对模式进行操作。</strong>定义数据库模式的实现细节。DDL中提供了指定<strong>一致性约束</strong>的工具。</p>
<p>DDL以指令作为输入，输出放在<strong>数据字典</strong>中，数据字典中包含<strong>元数据</strong>（数据的数据）。</p>
<hr>
<a class="article-more-a" href="/2019/05/30/《数据库系统概念》第六版-读书笔记/#more">more >></a>
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缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
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