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    <link rel="alternate" hreflang="en-us" href="https://iotdb.apache.org/UserGuide/V0.13.x/Data-Concept/Compression.html"><meta property="og:url" content="https://iotdb.apache.org/zh/UserGuide/V0.13.x/Data-Concept/Compression.html"><meta property="og:site_name" content="IoTDB Website"><meta property="og:description" content="压缩方式 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（SNAP..."><meta property="og:type" content="article"><meta property="og:locale" content="zh-CN"><meta property="og:locale:alternate" content="en-US"><meta property="og:updated_time" content="2023-07-10T03:11:17.000Z"><meta property="article:modified_time" content="2023-07-10T03:11:17.000Z"><script type="application/ld+json">{"@context":"https://schema.org","@type":"Article","headline":"","image":[""],"dateModified":"2023-07-10T03:11:17.000Z","author":[]}</script><link rel="icon" href="/favicon.ico"><meta name="Description" content="Apache IoTDB: Time Series Database for IoT"><meta name="Keywords" content="TSDB, time series, time series database, IoTDB, IoT database, IoT data management,时序数据库, 时间序列管理, IoTDB, 物联网数据库, 实时数据库, 物联网数据管理, 物联网数据"><meta name="baidu-site-verification" content="wfKETzB3OT"><meta name="google-site-verification" content="mZWAoRY0yj_HAr-s47zHCGHzx5Ju-RVm5wDbPnwQYFo"><script type="text/javascript">
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       </script><title>IoTDB Website</title><meta name="description" content="压缩方式 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（SNAP...">
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href="#基本压缩方式"><span>基本压缩方式</span></a></h3><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 支持以下几种压缩方式：</p><ul><li>UNCOMPRESSED（不压缩）</li><li>SNAPPY 压缩</li><li>LZ4 压缩</li><li>GZIP 压缩</li></ul><p>压缩方式的指定语法详见本文 <a class="route-link" href="/zh/UserGuide/V0.13.x/Reference/SQL-Reference.html">SQL 参考文档</a>。</p><h3 id="压缩比统计信息" tabindex="-1"><a class="header-anchor" href="#压缩比统计信息"><span>压缩比统计信息</span></a></h3><p memtable_flush_time="">压缩比统计信息文件：data/system/storage_groups/compression_ratio/Ratio-{ratio_sum}-</p><ul><li>ratio_sum: memtable压缩比的总和</li><li>memtable_flush_time: memtable刷盘的总次数</li></ul><p>通过 <code>ratio_sum / memtable_flush_time</code> 可以计算出平均压缩比</p></div><!--[--><!----><!--]--><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/zh/UserGuide/V0.13.x/Data-Concept/Compression.md" rel="noopener noreferrer" target="_blank" aria-label="发现错误？在 GitHub 上编辑此页" class="nav-link vp-meta-label"><!--[--><svg 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