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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (In progress)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>开始</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>概述</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>概念</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/Master/Concept/Data Model and Terminology.html" class="sidebar-link">数据模型与技术</a></li><li><a href="/zh/UserGuide/Master/Concept/Data Type.html" class="sidebar-link">数据类型</a></li><li><a href="/zh/UserGuide/Master/Concept/Encoding.html" class="sidebar-link">编码方式</a></li><li><a href="/zh/UserGuide/Master/Concept/Compression.html" aria-current="page" class="active sidebar-link">压缩方式</a></li><li><a href="/zh/UserGuide/Master/Concept/SDT.html" class="sidebar-link">旋转门压缩</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>服务器端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>客户端</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>操作指南</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>生态集成</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>系统设计</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="压缩方式"><a href="#压缩方式" class="header-anchor">#</a> 压缩方式</h1> <p>当时间序列写入并按照指定的类型编码为二进制数据后，IoTDB会使用压缩技术对该数据进行压缩，进一步提升空间存储效率。虽然编码和压缩都旨在提升存储效率，但编码技术通常只适合特定的数据类型（如二阶差分编码只适合与INT32或者INT64编码，存储浮点数需要先将他们乘以10m以转换为整数），然后将它们转换为二进制流。压缩方式（SNAPPY）针对二进制流进行压缩，因此压缩方式的使用不再受数据类型的限制。</p> <p>IoTDB允许在创建一个时间序列的时候指定该列的压缩方式。现阶段IoTDB现在支持的压缩方式有三种：</p> <ul><li>UNCOMPRESSED（不压缩）</li> <li>SNAPPY压缩</li> <li>LZ4压缩</li></ul> <p>压缩方式的指定语法详见本文<a href="/zh/UserGuide/Master/Operation Manual/SQL Reference.html">5.4节</a>。</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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