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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>In IoTDB SDT compresses and discards data when flushing into the disk.</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> <p>Supported datatypes:</p> <ul><li>INT32 (Integer)</li> <li>INT64 (Long Integer)</li> <li>FLOAT (Single Precision Floating Point)</li> <li>DOUBLE (Double Precision Floating Point)</li></ul> <p>The following is an example of using SDT compression.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> CREATE TIMESERIES root.sg1.d0.s0 WITH DATATYPE=INT32,ENCODING=PLAIN,LOSS=SDT,COMPDEV=2 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Prior to flushing and SDT compression, the results are shown below:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> SELECT s0 FROM root.sg1.d0 |
| +-----------------------------+--------------+ |
| | Time|root.sg1.d0.s0| |
| +-----------------------------+--------------+ |
| |2017-11-01T00:06:00.001+08:00| 1| |
| |2017-11-01T00:06:00.002+08:00| 1| |
| |2017-11-01T00:06:00.003+08:00| 1| |
| |2017-11-01T00:06:00.004+08:00| 1| |
| |2017-11-01T00:06:00.005+08:00| 1| |
| |2017-11-01T00:06:00.006+08:00| 1| |
| |2017-11-01T00:06:00.007+08:00| 1| |
| |2017-11-01T00:06:00.015+08:00| 10| |
| |2017-11-01T00:06:00.016+08:00| 20| |
| |2017-11-01T00:06:00.017+08:00| 1| |
| |2017-11-01T00:06:00.018+08:00| 30| |
| +-----------------------------+--------------+ |
| Total line number = 11 |
| It costs 0.008s |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br></div></div><p>After flushing and SDT compression, the results are shown below:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>IoTDB> FLUSH |
| IoTDB> SELECT s0 FROM root.sg1.d0 |
| +-----------------------------+--------------+ |
| | Time|root.sg1.d0.s0| |
| +-----------------------------+--------------+ |
| |2017-11-01T00:06:00.001+08:00| 1| |
| |2017-11-01T00:06:00.007+08:00| 1| |
| |2017-11-01T00:06:00.015+08:00| 10| |
| |2017-11-01T00:06:00.016+08:00| 20| |
| |2017-11-01T00:06:00.017+08:00| 1| |
| +-----------------------------+--------------+ |
| Total line number = 5 |
| It costs 0.044s |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><p>SDT takes effect when flushing to the disk. The SDT algorithm always stores the first point and does not store the last point.</p> <p>The data in [2017-11-01T00:06:00.001, 2017-11-01T00:06:00.007] is within the compression deviation thus discarded. |
| The data point at time 2017-11-01T00:06:00.007 is stored because the next data point at time 2017-11-01T00:06:00.015 |
| exceeds compression deviation. When a data point exceeds the compression deviation, SDT stores the last read |
| point and updates the upper and lower boundaries. The last point at time 2017-11-01T00:06:00.018 is not stored.</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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