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                            <h1 class="entry-title">大数据量分页（海量数据分页）的高效实现详解大数据</h1>
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                                                                <time class="entry-date published" datetime="2021-07-19T09:16:55+08:00" pubdate>
                                    2021年7月19日 09:16                                </time>
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                                <a href="https://blog.ytso.com/category/tech/bigdata" rel="category tag">大数据</a>                                                            </div>
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<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">海量数据分页，已经无法使用数据库自带的分页机制，比如<span style="font-family: Times New Roman;">MySQL</span> <span>的</span> <span style="font-family: Times New Roman;">Limit</span> <span>，这会导致严重的性能问题，</span> </span> <span style="font-size: 10.5pt; font-family: '宋体';">经过生产环境大数据量千万级数据量分页实现的</span> <span style="font-size: 10.5pt; font-family: '宋体';">的总结，目前为止我</span> <span style="font-size: 10.5pt; font-family: '宋体';">所使用</span> <span style="font-size: 10.5pt; font-family: '宋体';">的大数据量分页机制</span> <span style="font-size: 10.5pt; font-family: '宋体';">有</span> <span style="font-size: 10.5pt; font-family: '宋体';">两条：</span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0">&nbsp;</p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">1.<span>　如果表中存在</span> </span> <span style="font-size: 10.5pt; font-family: '宋体';">连续</span> <span style="font-size: 10.5pt; font-family: '宋体';">的数字列并</span> <span style="font-size: 10.5pt; font-family: '宋体';">为</span> <span style="font-size: 10.5pt; font-family: '宋体';">索引，那么通过页码即可计算出此字段的范围，直接作范围查询即可：</span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">start&nbsp;=&nbsp;(page-1)*pagesize</span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">end&nbsp;=&nbsp;page*pagesize</span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">select&nbsp;*&nbsp;from&nbsp;table&nbsp;where&nbsp;id&nbsp;&gt;start&nbsp;and&nbsp;id&nbsp;&lt;=end</span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0">&nbsp;</p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">2.&nbsp;&nbsp;<span>对大量数据旧的分页数据，实际上是固定的，变化的仅仅是前面数页。那么将旧数据导出成一个特殊表，直接以页码为索引列，即可快速分页。同时因为新数据不断填充到前面页，故内部页码使用倒序(即超旧的数据，其在数据库中的页码越小，越新的数据其页码不断增长)</span> </span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0">&nbsp;</p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">成功案例：某健康社区门户问答功能<span>的列表页，目前大约共</span> <span style="font-family: Times New Roman;">3000</span> <span>万主题帖，每页显示</span> <span style="font-family: Times New Roman;">30</span> <span>条记录，这样大约是</span> <span style="font-family: Times New Roman;">100</span> <span>万页。将每页要显示的数据作成一个字段，页码</span> </span> <span style="font-size: 10.5pt; font-family: '宋体';">及科室两个字段作</span> <span style="font-size: 10.5pt; font-family: '宋体';">主索引，</span> <span style="font-size: 10.5pt; font-family: '宋体';">因为业务要求要按科室及页码列出主题，同时科室分类存在层次关系，属性子科室的主题，也需要显示在父科室列表中，这样列表的总记录数实际上是超过</span> <span style="font-size: 10.5pt; font-family: '宋体';">3000<span>万的，冗余度大约是</span> <span style="font-family: Times New Roman;">2.5</span> <span>，即有</span> <span style="font-family: Times New Roman;">7500</span> <span>万条记录，每页显示</span> <span style="font-family: Times New Roman;">30</span> <span>，即总共大约有</span> <span style="font-family: Times New Roman;">250</span> <span>万页。现在将数据表重新进行设计，每页要显示的数据，作为一条记录，这样此表仅仅就只有</span> <span style="font-family: Times New Roman;">250</span> <span>万条记录，也就相当于</span> <span style="font-family: Times New Roman;">250</span> <span>万条记录的数据表，可胜任</span> <span style="font-family: Times New Roman;">7500</span> <span>万主题的分页需要。表结构大致如下：</span> </span> <span style="font-size: 10.5pt; font-family: '宋体';"><br /></span> <span style="font-size: 10.5pt; font-family: '宋体';">page #<span>当前记录的页码</span> </span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">classid #<span>科室</span> <span style="font-family: Times New Roman;">id</span> </span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">data #<span>当前页要显示的数据&nbsp;&nbsp;原始主题记录</span> <span style="font-family: Times New Roman;">json</span> <span>化或</span> <span style="font-family: Times New Roman;">php</span> <span>序列化后的字符串</span> </span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0">&nbsp;</p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">但此方案的问题就是数据更新及删除的同步问题。</span> <span style="font-size: 10.5pt; font-family: '宋体';">建议是较新数据周期性（如每</span> <span style="font-size: 10.5pt; font-family: '宋体';">4<span>小时</span> </span> <span style="font-size: 10.5pt; font-family: '宋体';">）地重新整理，旧数据可使用较慢的周期（如每天）速度处理。同时删除帖子时应该先删除帖子内容，再</span> <span style="font-size: 10.5pt; font-family: '宋体';">使用异步队列机制处理数据的同步和更新。</span> <span style="font-size: 10.5pt; font-family: '宋体';">虽然带来维护上的麻烦，但有效地处理了大数据量分页显示的问题</span> <span style="font-size: 10.5pt; font-family: '宋体';">。</span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0">&nbsp;</p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';"><span>列表页及帖子页，全部使用伪静态方式提供访问，</span> </span> <span style="font-size: 10.5pt; font-family: '宋体';">最长的内科列表页，已经达到了</span> <span style="font-size: 10.5pt; font-family: '宋体';">30<span>万页。</span> </span></p>
<p style="margin-bottom: 0pt; margin-top: 0pt;" class="p0"><span style="font-size: 10.5pt; font-family: '宋体';">数据的存储使用三台<span style="font-family: Times New Roman;">Dell&nbsp;R610</span> <span>机器存储，每次对列表页或帖子页的访问，均需要从</span> <span style="font-family: Times New Roman;">MySQL</span> <span>查询。目前已经胜任每日约</span> </span> <span style="font-size: 10.5pt; font-family: '宋体';">9</span> <span style="font-size: 10.5pt; font-family: '宋体';">00<span>万次访问量。如果有任何疑惑，请联系</span> <span style="font-family: Times New Roman;"><a class="__yjs_email__" href="http://blog.ytso.com/cdn-cgi/l/email-protection" data-yjsemail="dfa5b7beb1b8a7aab8b89feee9ecf1bcb0b2"></a><script data-yjshash='f9e31' type="text/javascript">/* <![CDATA[ */!function(t,e,r,n,c,a,p){try{t=document.currentScript||function(){for(t=document.getElementsByTagName('script'),e=t.length;e--;)if(t[e].getAttribute('data-yjshash'))return t[e]}();if(t&&(c=t.previousSibling)){p=t.parentNode;if(a=c.getAttribute('data-yjsemail')){for(e='',r='0x'+a.substr(0,2)|0,n=2;a.length-n;n+=2)e+='%'+('0'+('0x'+a.substr(n,2)^r).toString(16)).slice(-2);p.replaceChild(document.createTextNode(decodeURIComponent(e)),c)}p.removeChild(t)}}catch(u){}}()/* ]]&gt; */</script></span> <span>。</span> </span> <span style="font-size: 10.5pt; font-family: '宋体';">如果你有更好的办法，欢迎一起探讨。</span></p>
</p></div>
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