数据库相关概念
分类专栏: Mysql&
简介 NoSql的阐述
<p class="MsoNormal"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: Calibri;">NoSQL </span><span style="font-family: 宋体;">意义</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000;"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: Calibri;">1.</span><span style="font-family: 宋体;">易扩展、高性能、高可用</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000;"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: Calibri;">2.</span><span style="font-family: 宋体;">较容易映射复杂数据</span><span style="font-family: Calibri;">(key-value)</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000;"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: Calibri;">3.</span><span style="font-family: 宋体;">无事务特性要求</span><span style="font-family: Calibri;">(ACID</span><span style="font-family: 宋体;">特性</span><span style="font-family: Calibri;">)</span></span></p>
<p class="MsoNormal"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">数据库相关概念</span></span></p>
<p class="MsoNormal"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">关系型数据库,</span> <span style="font-family: 宋体;">是指采用了关系模型来组织数据的数据库。</span></span></p>
<p class="MsoNormal"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: Calibri;">NoSQL</span><span style="font-family: 宋体;">是对不同于传统的关系数据库的数据库管理系统的统称。</span></span></p>
<p class="MsoNormal"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: Calibri;">NoSQL </span><span style="font-family: 宋体;">设计</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">1. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">常见场景及设计</span><span style="font-family: Calibri;">(</span><span style="font-family: 宋体;">内嵌、父</span><span style="font-family: Calibri;">/</span><span style="font-family: 宋体;">子引用、反范式</span><span style="font-family: Calibri;">)</span></span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: Calibri; mso-fareast-font-family: 宋体; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"> </span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">什么是内嵌</span><span style="font-family: Calibri;">?</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">内嵌是指存在关联关系的文档,放在同一文档中,以数组的形式存放</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph; mso-list: l1 level1 lfo2;" align="justify"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">1. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">减少了关联查询</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph; mso-list: l1 level1 lfo2;" align="justify"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">2. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">适合于单类需要描述的属性</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph; mso-list: l1 level1 lfo2;" align="justify"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">3. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">不经常变化的属性</span><span style="font-family: Calibri;">(</span><span style="font-family: 宋体;">扩展、嵌套关联</span><span style="font-family: Calibri;">) </span></span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">什么是父引用</span><span style="font-family: Calibri;">?</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">父引用是指存在一对多的情况中,放在同一文档中,以数组的形式存放。</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">子引用是指存在一对非常多的情况中,由于数据库文档存放限制,这个时候进行反向引用。</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph; mso-list: l2 level1 lfo3;" align="justify"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">1. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">引用数据内容是否非常多</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph; mso-list: l2 level1 lfo3;" align="justify"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">2. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">引用数据量是否非常庞大,而且在增加</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph; mso-list: l2 level1 lfo3;" align="justify"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">3. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">数据是否需要单独访问</span></span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">什么是反范式?</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">范式是指按既定的用法,范式就是一种公认的模型或模式。反范式</span><span style="font-family: Calibri;">-></span><span style="font-family: 宋体;">不走寻常路</span><span style="font-family: Calibri;">~~~</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph; mso-list: l3 level1 lfo4;" align="justify"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">1. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">是否又提升性能的区间</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph; mso-list: l3 level1 lfo4;" align="justify"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">2. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">数据量的变化是否非常庞大,庞大到更新会异常低效</span></span></p>
<p class="MsoNormal" style="text-indent: 21.0000pt; mso-char-indent-count: 0.0000; mso-pagination: none; text-align: justify; text-justify: inter-ideograph; mso-list: l3 level1 lfo4;" align="justify"><!-- [if !supportLists]--><span style="font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;">3. </span><!--[endif]--><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">先考虑读写比,才考虑反范式</span></span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"> </span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">总结:</span></span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">优先考虑内嵌,如果单独访问,则不适合</span></span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">数组不应该无限制增长</span></span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"><span style="font-family: 宋体;">考虑读写比,考虑反范式,考虑应用场景</span></span></p>
<p class="MsoNormal" style="mso-pagination: none; text-align: justify; text-justify: inter-ideograph;" align="justify"><span style="mso-spacerun: 'yes'; font-family: Calibri; mso-fareast-font-family: 宋体; mso-bidi-font-family: 'Times New Roman'; font-size: 10.5000pt; mso-font-kerning: 1.0000pt;"> </span></p>
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