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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 User Guide (In progress)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Concept</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/Master/Concept/Data Model and Terminology.html" class="sidebar-link">Data Model and Terminology</a></li><li><a href="/UserGuide/Master/Concept/Data Type.html" class="sidebar-link">Data Type</a></li><li><a href="/UserGuide/Master/Concept/Encoding.html" class="sidebar-link">Encoding</a></li><li><a href="/UserGuide/Master/Concept/Compression.html" class="sidebar-link">Compression</a></li><li><a href="/UserGuide/Master/Concept/SDT.html" aria-current="page" class="active sidebar-link">SDT</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Client</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Architecture</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="sdt"><a href="#sdt" class="header-anchor">#</a> SDT</h1> <p>The Swinging Door Trending (SDT) algorithm is a lossy compression algorithm. |
| SDT has low computational complexity and uses a linear trend to represent a quantity of data.</p> <p>IoTDB allows you to specify the properties of SDT when creating a time series, and supports three properties:</p> <ul><li>CompDev (Compression Deviation)</li></ul> <p>CompDev is the most important parameter in SDT that represents the maximum difference between the current sample and the current linear trend.</p> <ul><li>CompMin (Compression Minimum)</li></ul> <p>CompMin is used for noisy reduction. CompMin measures the time distance between two stored data points, |
| if the current point's time to the last stored point's time distance is smaller than or equal to compMin, |
| current point will NOT be stored regardless of compression deviation.</p> <ul><li>CompMax (Compression Maximum)</li></ul> <p>CompMax is used to periodically check the time distance between the last stored point to the current point. |
| It measures the time difference between stored points. If the current point time to the last |
| stored point's time distance is greater than or equal to compMax, current point will be stored regardless of compression deviation.</p> <p>The specified syntax for SDT is detailed in <a href="/UserGuide/Master/Operation Manual/SQL Reference.html">Create Timeseries Statement</a>.</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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