<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title> </title>
    <meta name="generator" content="VuePress 1.8.2">
    <link rel="icon" href="/favicon.ico">
    <meta name="description" content=" ">
    <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">
    
    <link rel="preload" href="/assets/css/0.styles.ccadf850.css" as="style"><link rel="preload" href="/assets/js/app.fe44b663.js" as="script"><link rel="preload" href="/assets/js/3.5626571b.js" as="script"><link rel="preload" href="/assets/js/152.7fbfa55b.js" as="script"><link rel="prefetch" href="/assets/js/10.77e7d27b.js"><link rel="prefetch" href="/assets/js/100.5392026f.js"><link rel="prefetch" href="/assets/js/101.4d24dbb3.js"><link rel="prefetch" href="/assets/js/102.4db55384.js"><link rel="prefetch" href="/assets/js/103.28a00d56.js"><link rel="prefetch" href="/assets/js/104.c1cad722.js"><link rel="prefetch" href="/assets/js/105.2dbc18e7.js"><link rel="prefetch" href="/assets/js/106.03cb3598.js"><link rel="prefetch" href="/assets/js/107.1aa2e9d5.js"><link rel="prefetch" href="/assets/js/108.c8e15789.js"><link rel="prefetch" href="/assets/js/109.4e029678.js"><link rel="prefetch" href="/assets/js/11.242ea813.js"><link rel="prefetch" href="/assets/js/110.2673e754.js"><link rel="prefetch" href="/assets/js/111.99869946.js"><link rel="prefetch" href="/assets/js/112.6931e30d.js"><link rel="prefetch" href="/assets/js/113.30edd688.js"><link rel="prefetch" href="/assets/js/114.cba21417.js"><link rel="prefetch" href="/assets/js/115.36ed9d85.js"><link rel="prefetch" href="/assets/js/116.b6f26e1b.js"><link rel="prefetch" href="/assets/js/117.b7ead194.js"><link rel="prefetch" href="/assets/js/118.0489f137.js"><link rel="prefetch" href="/assets/js/119.f4531020.js"><link rel="prefetch" href="/assets/js/12.4c48405a.js"><link rel="prefetch" href="/assets/js/120.d1bc4a0d.js"><link rel="prefetch" href="/assets/js/121.c4dac7da.js"><link rel="prefetch" href="/assets/js/122.37b6650b.js"><link rel="prefetch" href="/assets/js/123.6802c679.js"><link rel="prefetch" href="/assets/js/124.3a1dcf58.js"><link rel="prefetch" href="/assets/js/125.0c3e885a.js"><link rel="prefetch" href="/assets/js/126.fbfa46eb.js"><link rel="prefetch" href="/assets/js/127.110bc389.js"><link rel="prefetch" href="/assets/js/128.fd2a9b78.js"><link rel="prefetch" href="/assets/js/129.b0669c7b.js"><link rel="prefetch" href="/assets/js/13.16ded47d.js"><link rel="prefetch" href="/assets/js/130.830f695a.js"><link rel="prefetch" href="/assets/js/131.f74784eb.js"><link rel="prefetch" href="/assets/js/132.5bd44b31.js"><link rel="prefetch" href="/assets/js/133.4871f071.js"><link rel="prefetch" href="/assets/js/134.c1ebfd44.js"><link rel="prefetch" href="/assets/js/135.06b43884.js"><link rel="prefetch" href="/assets/js/136.4125fe2d.js"><link rel="prefetch" href="/assets/js/137.f79fb732.js"><link rel="prefetch" href="/assets/js/138.925cc589.js"><link rel="prefetch" href="/assets/js/139.269b4122.js"><link rel="prefetch" href="/assets/js/14.66eebc6d.js"><link rel="prefetch" href="/assets/js/140.8acac491.js"><link rel="prefetch" href="/assets/js/141.5739ba5c.js"><link rel="prefetch" href="/assets/js/142.0a0bb60d.js"><link rel="prefetch" href="/assets/js/143.a85602a6.js"><link rel="prefetch" href="/assets/js/144.af08976e.js"><link rel="prefetch" href="/assets/js/145.54dd8613.js"><link rel="prefetch" href="/assets/js/146.d6942192.js"><link rel="prefetch" href="/assets/js/147.58b089c2.js"><link rel="prefetch" href="/assets/js/148.f3061126.js"><link rel="prefetch" href="/assets/js/149.bed18caa.js"><link rel="prefetch" href="/assets/js/15.843fe861.js"><link rel="prefetch" href="/assets/js/150.857bbcb9.js"><link rel="prefetch" href="/assets/js/151.8df8eaff.js"><link rel="prefetch" href="/assets/js/153.88e78e8e.js"><link rel="prefetch" href="/assets/js/154.4c0105cf.js"><link rel="prefetch" href="/assets/js/155.56c02f22.js"><link rel="prefetch" href="/assets/js/156.3610ca5b.js"><link rel="prefetch" href="/assets/js/157.a82e8d14.js"><link rel="prefetch" href="/assets/js/158.cd306550.js"><link rel="prefetch" href="/assets/js/159.7c3f6836.js"><link rel="prefetch" href="/assets/js/16.17c1f643.js"><link rel="prefetch" href="/assets/js/160.d9e7ebc3.js"><link rel="prefetch" href="/assets/js/161.f69489a3.js"><link rel="prefetch" href="/assets/js/162.260f8f8c.js"><link rel="prefetch" href="/assets/js/163.6f4c436f.js"><link rel="prefetch" href="/assets/js/164.48a2358e.js"><link rel="prefetch" href="/assets/js/165.beba59fe.js"><link rel="prefetch" href="/assets/js/166.2534a588.js"><link rel="prefetch" href="/assets/js/167.daba1492.js"><link rel="prefetch" href="/assets/js/168.66d50e2f.js"><link rel="prefetch" href="/assets/js/169.4a288ab4.js"><link rel="prefetch" href="/assets/js/17.9b8df773.js"><link rel="prefetch" href="/assets/js/170.f0555c86.js"><link rel="prefetch" href="/assets/js/171.bbe4ba1a.js"><link rel="prefetch" href="/assets/js/172.712c6bac.js"><link rel="prefetch" href="/assets/js/173.c3917d0d.js"><link rel="prefetch" href="/assets/js/174.9d843f6f.js"><link rel="prefetch" href="/assets/js/175.ca25b135.js"><link rel="prefetch" href="/assets/js/176.35f2d232.js"><link rel="prefetch" href="/assets/js/177.e8e6286d.js"><link rel="prefetch" href="/assets/js/178.c37c5efd.js"><link rel="prefetch" href="/assets/js/179.84f3bdd6.js"><link rel="prefetch" href="/assets/js/18.122d5826.js"><link rel="prefetch" href="/assets/js/180.32503609.js"><link rel="prefetch" href="/assets/js/181.219cb189.js"><link rel="prefetch" href="/assets/js/182.e90074d5.js"><link rel="prefetch" href="/assets/js/183.87f069d1.js"><link rel="prefetch" href="/assets/js/184.6b62bd9f.js"><link rel="prefetch" href="/assets/js/185.4e6b021e.js"><link rel="prefetch" href="/assets/js/186.3679d30d.js"><link rel="prefetch" href="/assets/js/187.aeba6c58.js"><link rel="prefetch" href="/assets/js/188.cc1022eb.js"><link rel="prefetch" href="/assets/js/189.5ac3b4a4.js"><link rel="prefetch" href="/assets/js/19.9187dec1.js"><link rel="prefetch" href="/assets/js/190.ff15e49f.js"><link rel="prefetch" href="/assets/js/191.369829d5.js"><link rel="prefetch" href="/assets/js/192.1d1eb36e.js"><link rel="prefetch" href="/assets/js/193.fc0fb393.js"><link rel="prefetch" href="/assets/js/194.b47fbc4c.js"><link rel="prefetch" href="/assets/js/195.9e36d668.js"><link rel="prefetch" href="/assets/js/196.2d1223f7.js"><link rel="prefetch" href="/assets/js/197.55863e11.js"><link rel="prefetch" href="/assets/js/198.a48cc095.js"><link rel="prefetch" href="/assets/js/199.3a9c2528.js"><link rel="prefetch" href="/assets/js/20.cf088c3b.js"><link rel="prefetch" href="/assets/js/200.195ff96b.js"><link rel="prefetch" href="/assets/js/201.4d6c6e24.js"><link rel="prefetch" href="/assets/js/202.c32388f7.js"><link rel="prefetch" href="/assets/js/203.080586a5.js"><link rel="prefetch" href="/assets/js/204.a3b3ce92.js"><link rel="prefetch" href="/assets/js/205.9af51d77.js"><link rel="prefetch" href="/assets/js/206.ea246089.js"><link rel="prefetch" href="/assets/js/207.1c222b6c.js"><link rel="prefetch" href="/assets/js/208.fa41b6db.js"><link rel="prefetch" href="/assets/js/209.206e9cfe.js"><link rel="prefetch" href="/assets/js/21.fd51f269.js"><link rel="prefetch" href="/assets/js/210.e4599d5b.js"><link rel="prefetch" href="/assets/js/211.b4f21019.js"><link rel="prefetch" href="/assets/js/212.552b3f7c.js"><link rel="prefetch" href="/assets/js/213.e7924e39.js"><link rel="prefetch" href="/assets/js/214.4889616d.js"><link rel="prefetch" href="/assets/js/215.8bc1d1bf.js"><link rel="prefetch" href="/assets/js/216.aeaaff79.js"><link rel="prefetch" href="/assets/js/217.51dbbd91.js"><link rel="prefetch" href="/assets/js/218.477c1e20.js"><link rel="prefetch" href="/assets/js/219.fd6ed6fa.js"><link rel="prefetch" href="/assets/js/22.f9d73f8a.js"><link rel="prefetch" href="/assets/js/220.84349773.js"><link rel="prefetch" href="/assets/js/221.4b98b09e.js"><link rel="prefetch" href="/assets/js/222.57476182.js"><link rel="prefetch" href="/assets/js/223.1c0323f8.js"><link rel="prefetch" href="/assets/js/224.61e78712.js"><link rel="prefetch" href="/assets/js/225.9b6f0752.js"><link rel="prefetch" href="/assets/js/226.4868d0a5.js"><link rel="prefetch" href="/assets/js/227.6ba50795.js"><link rel="prefetch" href="/assets/js/228.1d3cd90f.js"><link rel="prefetch" href="/assets/js/229.6ca83068.js"><link rel="prefetch" href="/assets/js/23.6c7d7eea.js"><link rel="prefetch" href="/assets/js/230.5e6f7ed2.js"><link rel="prefetch" href="/assets/js/231.a8ecd36e.js"><link rel="prefetch" href="/assets/js/232.a18567c5.js"><link rel="prefetch" href="/assets/js/233.f79fadcf.js"><link rel="prefetch" href="/assets/js/234.d9207163.js"><link rel="prefetch" href="/assets/js/235.e81b51ae.js"><link rel="prefetch" href="/assets/js/236.b9c32f41.js"><link rel="prefetch" href="/assets/js/237.d795e1ce.js"><link rel="prefetch" href="/assets/js/238.49757612.js"><link rel="prefetch" href="/assets/js/239.aeda84ea.js"><link rel="prefetch" href="/assets/js/24.a553bb19.js"><link rel="prefetch" href="/assets/js/240.07479801.js"><link rel="prefetch" href="/assets/js/241.ba1379fe.js"><link rel="prefetch" href="/assets/js/242.ce1b153f.js"><link rel="prefetch" href="/assets/js/243.18fd3c66.js"><link rel="prefetch" href="/assets/js/244.2b98e85b.js"><link rel="prefetch" href="/assets/js/245.bf64d7c9.js"><link rel="prefetch" href="/assets/js/246.d0a5b73c.js"><link rel="prefetch" href="/assets/js/247.b9bc9104.js"><link rel="prefetch" href="/assets/js/248.714df448.js"><link rel="prefetch" href="/assets/js/249.e0039e9d.js"><link rel="prefetch" href="/assets/js/25.1e42b275.js"><link rel="prefetch" href="/assets/js/250.ca664993.js"><link rel="prefetch" href="/assets/js/251.b47f298a.js"><link rel="prefetch" href="/assets/js/252.71392152.js"><link rel="prefetch" href="/assets/js/253.e0f23ec8.js"><link rel="prefetch" href="/assets/js/254.6d43bbe7.js"><link rel="prefetch" href="/assets/js/255.c1779bd2.js"><link rel="prefetch" href="/assets/js/256.6a8a06f3.js"><link rel="prefetch" href="/assets/js/257.4e74c883.js"><link rel="prefetch" href="/assets/js/258.f4b72fd8.js"><link rel="prefetch" href="/assets/js/259.f9b80571.js"><link rel="prefetch" href="/assets/js/26.0057d37b.js"><link rel="prefetch" href="/assets/js/260.10e21bfc.js"><link rel="prefetch" href="/assets/js/261.402db160.js"><link rel="prefetch" href="/assets/js/262.02c5372b.js"><link rel="prefetch" href="/assets/js/263.3454f741.js"><link rel="prefetch" href="/assets/js/264.dfc588bd.js"><link rel="prefetch" href="/assets/js/265.f1fee64b.js"><link rel="prefetch" href="/assets/js/266.baac44a1.js"><link rel="prefetch" href="/assets/js/267.b6f584a5.js"><link rel="prefetch" href="/assets/js/268.013f92f7.js"><link rel="prefetch" href="/assets/js/269.706a27e5.js"><link rel="prefetch" href="/assets/js/27.9e25f953.js"><link rel="prefetch" href="/assets/js/270.397dc6f7.js"><link rel="prefetch" href="/assets/js/271.5f063e14.js"><link rel="prefetch" href="/assets/js/272.b88b9e6e.js"><link rel="prefetch" href="/assets/js/273.f7eeeb80.js"><link rel="prefetch" href="/assets/js/274.8d7d8c2a.js"><link rel="prefetch" href="/assets/js/275.167633d2.js"><link rel="prefetch" href="/assets/js/276.bf42d85f.js"><link rel="prefetch" href="/assets/js/277.195beb55.js"><link rel="prefetch" href="/assets/js/278.852d1996.js"><link rel="prefetch" href="/assets/js/279.a3fb5857.js"><link rel="prefetch" href="/assets/js/28.0a801078.js"><link rel="prefetch" href="/assets/js/280.de229c1d.js"><link rel="prefetch" href="/assets/js/281.47d676fa.js"><link rel="prefetch" href="/assets/js/282.1db3920a.js"><link rel="prefetch" href="/assets/js/283.0ed31a9c.js"><link rel="prefetch" href="/assets/js/284.d2f802aa.js"><link rel="prefetch" href="/assets/js/285.0a18923e.js"><link rel="prefetch" href="/assets/js/286.60438a30.js"><link rel="prefetch" href="/assets/js/287.6fa63573.js"><link rel="prefetch" href="/assets/js/288.4432c980.js"><link rel="prefetch" href="/assets/js/289.789f44e7.js"><link rel="prefetch" href="/assets/js/29.a31435b1.js"><link rel="prefetch" href="/assets/js/290.3c1f2e4c.js"><link rel="prefetch" href="/assets/js/291.a340398b.js"><link rel="prefetch" href="/assets/js/292.8568adc1.js"><link rel="prefetch" href="/assets/js/293.42107ac0.js"><link rel="prefetch" href="/assets/js/294.5fae363a.js"><link rel="prefetch" href="/assets/js/295.eb955643.js"><link rel="prefetch" href="/assets/js/296.77ae03d2.js"><link rel="prefetch" href="/assets/js/297.e548ba7e.js"><link rel="prefetch" href="/assets/js/298.d08bd092.js"><link rel="prefetch" href="/assets/js/299.a9495179.js"><link rel="prefetch" href="/assets/js/30.60649b66.js"><link rel="prefetch" href="/assets/js/300.1f1c6539.js"><link rel="prefetch" href="/assets/js/301.45e54d01.js"><link rel="prefetch" href="/assets/js/302.41fa5b16.js"><link rel="prefetch" href="/assets/js/303.50302303.js"><link rel="prefetch" href="/assets/js/304.45ec5f49.js"><link rel="prefetch" href="/assets/js/305.4667a075.js"><link rel="prefetch" href="/assets/js/306.9adbbd88.js"><link rel="prefetch" href="/assets/js/307.01fbd282.js"><link rel="prefetch" href="/assets/js/308.ee661372.js"><link rel="prefetch" href="/assets/js/309.71fd6514.js"><link rel="prefetch" href="/assets/js/31.b5e715ce.js"><link rel="prefetch" href="/assets/js/310.2c1b5f58.js"><link rel="prefetch" href="/assets/js/311.bf369b6f.js"><link rel="prefetch" href="/assets/js/312.ee6deb53.js"><link rel="prefetch" href="/assets/js/313.b173305e.js"><link rel="prefetch" href="/assets/js/314.9bf7681c.js"><link rel="prefetch" href="/assets/js/315.9dced4c4.js"><link rel="prefetch" href="/assets/js/316.d1625f8e.js"><link rel="prefetch" href="/assets/js/317.ff874148.js"><link rel="prefetch" href="/assets/js/318.bc83f98a.js"><link rel="prefetch" href="/assets/js/319.eb7b75c1.js"><link rel="prefetch" href="/assets/js/32.e5e702b0.js"><link rel="prefetch" href="/assets/js/320.017cca1c.js"><link rel="prefetch" href="/assets/js/321.e34387cb.js"><link rel="prefetch" href="/assets/js/322.5aae6989.js"><link rel="prefetch" href="/assets/js/323.e4fd51b3.js"><link rel="prefetch" href="/assets/js/324.1ba3ee32.js"><link rel="prefetch" href="/assets/js/325.21254638.js"><link rel="prefetch" href="/assets/js/326.377d3f46.js"><link rel="prefetch" href="/assets/js/327.7734ba1d.js"><link rel="prefetch" href="/assets/js/328.e9791163.js"><link rel="prefetch" href="/assets/js/329.8acd00bc.js"><link rel="prefetch" href="/assets/js/33.b678d537.js"><link rel="prefetch" href="/assets/js/330.6cff02ec.js"><link rel="prefetch" href="/assets/js/331.98ebbe7d.js"><link rel="prefetch" href="/assets/js/332.1d9d1a04.js"><link rel="prefetch" href="/assets/js/333.e8be9a85.js"><link rel="prefetch" href="/assets/js/334.677f7d89.js"><link rel="prefetch" href="/assets/js/335.9bca2b37.js"><link rel="prefetch" href="/assets/js/336.b2a7394a.js"><link rel="prefetch" href="/assets/js/337.0231a5b2.js"><link rel="prefetch" href="/assets/js/338.1979cb4d.js"><link rel="prefetch" href="/assets/js/339.4bb8f0a9.js"><link rel="prefetch" href="/assets/js/34.f1aa3803.js"><link rel="prefetch" href="/assets/js/340.f0fa3c52.js"><link rel="prefetch" href="/assets/js/341.f8178251.js"><link rel="prefetch" href="/assets/js/342.7dd47706.js"><link rel="prefetch" href="/assets/js/343.363f2cae.js"><link rel="prefetch" href="/assets/js/344.2b4d1572.js"><link rel="prefetch" href="/assets/js/345.54e08f16.js"><link rel="prefetch" href="/assets/js/346.541ef94e.js"><link rel="prefetch" href="/assets/js/347.1f8a56e7.js"><link rel="prefetch" href="/assets/js/348.ff08d1b4.js"><link rel="prefetch" href="/assets/js/349.97e1160f.js"><link rel="prefetch" href="/assets/js/35.5612ab6a.js"><link rel="prefetch" href="/assets/js/350.1fa64f48.js"><link rel="prefetch" href="/assets/js/351.0cdcbb68.js"><link rel="prefetch" href="/assets/js/352.04f35660.js"><link rel="prefetch" href="/assets/js/353.c63abb11.js"><link rel="prefetch" href="/assets/js/354.f07fe232.js"><link rel="prefetch" href="/assets/js/355.9db8e984.js"><link rel="prefetch" href="/assets/js/356.7e54a7f7.js"><link rel="prefetch" href="/assets/js/357.b8b2c19a.js"><link rel="prefetch" href="/assets/js/358.ec88593c.js"><link rel="prefetch" href="/assets/js/359.57a348e6.js"><link rel="prefetch" href="/assets/js/36.4e36f97e.js"><link rel="prefetch" href="/assets/js/360.f91d4985.js"><link rel="prefetch" href="/assets/js/361.fd0b896b.js"><link rel="prefetch" href="/assets/js/362.3078bc4c.js"><link rel="prefetch" href="/assets/js/363.970af9b1.js"><link rel="prefetch" href="/assets/js/364.ce305e49.js"><link rel="prefetch" href="/assets/js/365.228a2005.js"><link rel="prefetch" href="/assets/js/366.3e0ce2e8.js"><link rel="prefetch" href="/assets/js/367.dfba61c0.js"><link rel="prefetch" href="/assets/js/368.d4307f98.js"><link rel="prefetch" href="/assets/js/369.730e7097.js"><link rel="prefetch" href="/assets/js/37.13b65e5d.js"><link rel="prefetch" href="/assets/js/370.e7a52728.js"><link rel="prefetch" href="/assets/js/371.99346247.js"><link rel="prefetch" href="/assets/js/372.09676253.js"><link rel="prefetch" href="/assets/js/373.2a7b274a.js"><link rel="prefetch" href="/assets/js/374.e347ead4.js"><link rel="prefetch" href="/assets/js/375.f70bcedd.js"><link rel="prefetch" href="/assets/js/376.c776b0ed.js"><link rel="prefetch" href="/assets/js/377.3d81f722.js"><link rel="prefetch" href="/assets/js/378.a7f10c5f.js"><link rel="prefetch" href="/assets/js/379.b18f1c51.js"><link rel="prefetch" href="/assets/js/38.c6f83038.js"><link rel="prefetch" href="/assets/js/380.a84e788a.js"><link rel="prefetch" href="/assets/js/381.521f1a2b.js"><link rel="prefetch" href="/assets/js/382.10ebffdc.js"><link rel="prefetch" href="/assets/js/383.fa0c4858.js"><link rel="prefetch" href="/assets/js/384.4d3a1d3e.js"><link rel="prefetch" href="/assets/js/385.edbe545d.js"><link rel="prefetch" href="/assets/js/386.aa0e0479.js"><link rel="prefetch" href="/assets/js/387.d08b9da1.js"><link rel="prefetch" href="/assets/js/388.3cafa76f.js"><link rel="prefetch" href="/assets/js/389.1c150739.js"><link rel="prefetch" href="/assets/js/39.41707d32.js"><link rel="prefetch" href="/assets/js/390.e3c6dc5b.js"><link rel="prefetch" href="/assets/js/391.097ce5d5.js"><link rel="prefetch" href="/assets/js/392.b1450deb.js"><link rel="prefetch" href="/assets/js/393.a9be5042.js"><link rel="prefetch" href="/assets/js/394.0f496e89.js"><link rel="prefetch" href="/assets/js/395.d66b20d2.js"><link rel="prefetch" href="/assets/js/396.a238eb17.js"><link rel="prefetch" href="/assets/js/397.c76a0b8d.js"><link rel="prefetch" href="/assets/js/398.3812b640.js"><link rel="prefetch" href="/assets/js/399.e6940f90.js"><link rel="prefetch" href="/assets/js/4.9c4b1c6d.js"><link rel="prefetch" href="/assets/js/40.f82f0187.js"><link rel="prefetch" href="/assets/js/400.5e0cfb93.js"><link rel="prefetch" href="/assets/js/401.f613f2ba.js"><link rel="prefetch" href="/assets/js/402.be1f5783.js"><link rel="prefetch" href="/assets/js/403.33c1396d.js"><link rel="prefetch" href="/assets/js/404.562089b0.js"><link rel="prefetch" href="/assets/js/405.93f42baf.js"><link rel="prefetch" href="/assets/js/406.ba8d00d1.js"><link rel="prefetch" href="/assets/js/407.0150b19f.js"><link rel="prefetch" href="/assets/js/408.728a1d15.js"><link rel="prefetch" href="/assets/js/409.ef560ed7.js"><link rel="prefetch" href="/assets/js/41.b6799c44.js"><link rel="prefetch" href="/assets/js/410.d3f65621.js"><link rel="prefetch" href="/assets/js/411.07ef2c9f.js"><link rel="prefetch" href="/assets/js/412.4a1d8057.js"><link rel="prefetch" href="/assets/js/413.ebf9aafc.js"><link rel="prefetch" href="/assets/js/414.a5433120.js"><link rel="prefetch" href="/assets/js/415.4dcc07c7.js"><link rel="prefetch" href="/assets/js/416.11747f6b.js"><link rel="prefetch" href="/assets/js/417.5270e086.js"><link rel="prefetch" href="/assets/js/418.d5fc9d05.js"><link rel="prefetch" href="/assets/js/419.540dcd2a.js"><link rel="prefetch" href="/assets/js/42.e6b0aae2.js"><link rel="prefetch" href="/assets/js/420.28641617.js"><link rel="prefetch" href="/assets/js/421.a6c3c8af.js"><link rel="prefetch" href="/assets/js/422.52ab97a6.js"><link rel="prefetch" href="/assets/js/423.7c5da32e.js"><link rel="prefetch" href="/assets/js/424.d39b15e0.js"><link rel="prefetch" href="/assets/js/425.2c8fbc5a.js"><link rel="prefetch" href="/assets/js/426.b6957825.js"><link rel="prefetch" href="/assets/js/427.b96cf924.js"><link rel="prefetch" href="/assets/js/428.6440b235.js"><link rel="prefetch" href="/assets/js/429.57902fe0.js"><link rel="prefetch" href="/assets/js/43.3fff5a4c.js"><link rel="prefetch" href="/assets/js/430.04255b2f.js"><link rel="prefetch" href="/assets/js/431.321286eb.js"><link rel="prefetch" href="/assets/js/432.72fdf31f.js"><link rel="prefetch" href="/assets/js/433.52676bc7.js"><link rel="prefetch" href="/assets/js/434.7bc3fee7.js"><link rel="prefetch" href="/assets/js/435.deac35a6.js"><link rel="prefetch" href="/assets/js/436.46f753f4.js"><link rel="prefetch" href="/assets/js/437.6a675a68.js"><link rel="prefetch" href="/assets/js/438.e8c8ae5b.js"><link rel="prefetch" href="/assets/js/439.ba3f2700.js"><link rel="prefetch" href="/assets/js/44.fee39d6b.js"><link rel="prefetch" href="/assets/js/440.98a7bff0.js"><link rel="prefetch" href="/assets/js/441.e12292fb.js"><link rel="prefetch" href="/assets/js/442.08f60114.js"><link rel="prefetch" href="/assets/js/443.d5d255b9.js"><link rel="prefetch" href="/assets/js/444.01c13452.js"><link rel="prefetch" href="/assets/js/445.954c3b0b.js"><link rel="prefetch" href="/assets/js/446.81521199.js"><link rel="prefetch" href="/assets/js/447.0cf2269e.js"><link rel="prefetch" href="/assets/js/448.fb62b763.js"><link rel="prefetch" href="/assets/js/449.2fd7ec4e.js"><link rel="prefetch" href="/assets/js/45.244b7680.js"><link rel="prefetch" href="/assets/js/450.3ff3ce7b.js"><link rel="prefetch" href="/assets/js/451.4b455f4a.js"><link rel="prefetch" href="/assets/js/452.51fbf6e4.js"><link rel="prefetch" href="/assets/js/453.4d5d4319.js"><link rel="prefetch" href="/assets/js/454.99948bc3.js"><link rel="prefetch" href="/assets/js/455.d1380266.js"><link rel="prefetch" href="/assets/js/456.22423caf.js"><link rel="prefetch" href="/assets/js/457.05a6e43b.js"><link rel="prefetch" href="/assets/js/458.2a93e9bc.js"><link rel="prefetch" href="/assets/js/459.dfc3d492.js"><link rel="prefetch" href="/assets/js/46.539f062d.js"><link rel="prefetch" href="/assets/js/460.2a50d5c4.js"><link rel="prefetch" href="/assets/js/461.07548ac3.js"><link rel="prefetch" href="/assets/js/462.214e91ce.js"><link rel="prefetch" href="/assets/js/463.414bc138.js"><link rel="prefetch" href="/assets/js/464.779a26ec.js"><link rel="prefetch" href="/assets/js/465.c61d57fa.js"><link rel="prefetch" href="/assets/js/466.ab4c1900.js"><link rel="prefetch" href="/assets/js/467.6398c8fc.js"><link rel="prefetch" href="/assets/js/468.f013763e.js"><link rel="prefetch" href="/assets/js/469.40bcf372.js"><link rel="prefetch" href="/assets/js/47.a8742825.js"><link rel="prefetch" href="/assets/js/470.ba1d5a08.js"><link rel="prefetch" href="/assets/js/471.9842c3d9.js"><link rel="prefetch" href="/assets/js/472.887667b1.js"><link rel="prefetch" href="/assets/js/473.ac9f4dc8.js"><link rel="prefetch" href="/assets/js/474.c950558a.js"><link rel="prefetch" href="/assets/js/475.ec6929d7.js"><link rel="prefetch" href="/assets/js/476.d351ffef.js"><link rel="prefetch" href="/assets/js/477.cbb436f4.js"><link rel="prefetch" href="/assets/js/478.10a8af05.js"><link rel="prefetch" href="/assets/js/479.3e21eec2.js"><link rel="prefetch" href="/assets/js/48.656f2900.js"><link rel="prefetch" href="/assets/js/480.2889f790.js"><link rel="prefetch" href="/assets/js/481.6504abc3.js"><link rel="prefetch" href="/assets/js/482.25c23f5a.js"><link rel="prefetch" href="/assets/js/483.11c430e0.js"><link rel="prefetch" href="/assets/js/484.4fb1d507.js"><link rel="prefetch" href="/assets/js/485.1ecbb4e0.js"><link rel="prefetch" href="/assets/js/486.a15cc699.js"><link rel="prefetch" href="/assets/js/487.b4a9526d.js"><link rel="prefetch" href="/assets/js/488.85d13879.js"><link rel="prefetch" href="/assets/js/489.3a566e3d.js"><link rel="prefetch" href="/assets/js/49.f271ac34.js"><link rel="prefetch" href="/assets/js/490.347d23af.js"><link rel="prefetch" href="/assets/js/491.558b7aa9.js"><link rel="prefetch" href="/assets/js/492.af9c4c53.js"><link rel="prefetch" href="/assets/js/493.f89bdb3c.js"><link rel="prefetch" href="/assets/js/494.a0142c98.js"><link rel="prefetch" href="/assets/js/495.d3de8850.js"><link rel="prefetch" href="/assets/js/496.d48c6630.js"><link rel="prefetch" href="/assets/js/497.3b9635e2.js"><link rel="prefetch" href="/assets/js/498.f587a80e.js"><link rel="prefetch" href="/assets/js/499.22f6be18.js"><link rel="prefetch" href="/assets/js/5.2a4451ec.js"><link rel="prefetch" href="/assets/js/50.7d8944cd.js"><link rel="prefetch" href="/assets/js/500.d054de5c.js"><link rel="prefetch" href="/assets/js/501.954e1b5c.js"><link rel="prefetch" href="/assets/js/502.4b184e51.js"><link rel="prefetch" href="/assets/js/503.10334ca5.js"><link rel="prefetch" href="/assets/js/504.0e074cd3.js"><link rel="prefetch" href="/assets/js/505.4993e90d.js"><link rel="prefetch" href="/assets/js/506.6f94a2f8.js"><link rel="prefetch" href="/assets/js/507.b255fcfd.js"><link rel="prefetch" href="/assets/js/508.95c9551e.js"><link rel="prefetch" href="/assets/js/509.1d2ab0fb.js"><link rel="prefetch" href="/assets/js/51.fd01b1a1.js"><link rel="prefetch" href="/assets/js/510.36c66e50.js"><link rel="prefetch" href="/assets/js/511.caf2e589.js"><link rel="prefetch" href="/assets/js/512.133bca04.js"><link rel="prefetch" href="/assets/js/513.e3f62ca2.js"><link rel="prefetch" href="/assets/js/514.f17c4a44.js"><link rel="prefetch" href="/assets/js/515.f637b155.js"><link rel="prefetch" href="/assets/js/516.3cccca96.js"><link rel="prefetch" href="/assets/js/517.80c43b59.js"><link rel="prefetch" href="/assets/js/518.f3438412.js"><link rel="prefetch" href="/assets/js/519.5a0ef98b.js"><link rel="prefetch" href="/assets/js/52.10d8a15b.js"><link rel="prefetch" href="/assets/js/520.d83038f1.js"><link rel="prefetch" href="/assets/js/521.4726d233.js"><link rel="prefetch" href="/assets/js/522.045aff30.js"><link rel="prefetch" href="/assets/js/523.9d9b45b5.js"><link rel="prefetch" href="/assets/js/524.86a7c6cf.js"><link rel="prefetch" href="/assets/js/525.1d6e7b79.js"><link rel="prefetch" href="/assets/js/526.c365bd67.js"><link rel="prefetch" href="/assets/js/527.555f8b61.js"><link rel="prefetch" href="/assets/js/528.690272cc.js"><link rel="prefetch" href="/assets/js/529.7f05b847.js"><link rel="prefetch" href="/assets/js/53.79f66cea.js"><link rel="prefetch" href="/assets/js/530.3fb31398.js"><link rel="prefetch" href="/assets/js/531.54b0ee66.js"><link rel="prefetch" href="/assets/js/532.42a967ca.js"><link rel="prefetch" href="/assets/js/54.1ec48dc5.js"><link rel="prefetch" href="/assets/js/55.9d4b8667.js"><link rel="prefetch" href="/assets/js/56.aa94202c.js"><link rel="prefetch" href="/assets/js/57.dd80489d.js"><link rel="prefetch" href="/assets/js/58.9af3c40d.js"><link rel="prefetch" href="/assets/js/59.70e0291b.js"><link rel="prefetch" href="/assets/js/6.3450075a.js"><link rel="prefetch" href="/assets/js/60.53b7d88b.js"><link rel="prefetch" href="/assets/js/61.b70ccd57.js"><link rel="prefetch" href="/assets/js/62.eef65e9b.js"><link rel="prefetch" href="/assets/js/63.3a66528e.js"><link rel="prefetch" href="/assets/js/64.ed6b77b6.js"><link rel="prefetch" href="/assets/js/65.5573ce3d.js"><link rel="prefetch" href="/assets/js/66.aa4ead2c.js"><link rel="prefetch" href="/assets/js/67.29edf638.js"><link rel="prefetch" href="/assets/js/68.38ac76fc.js"><link rel="prefetch" href="/assets/js/69.7f8c7118.js"><link rel="prefetch" href="/assets/js/7.c5c54fb4.js"><link rel="prefetch" href="/assets/js/70.368e2128.js"><link rel="prefetch" href="/assets/js/71.cf483d39.js"><link rel="prefetch" href="/assets/js/72.b095c9c5.js"><link rel="prefetch" href="/assets/js/73.7f2ffe57.js"><link rel="prefetch" href="/assets/js/74.d67c3927.js"><link rel="prefetch" href="/assets/js/75.d4945299.js"><link rel="prefetch" href="/assets/js/76.f01b8b07.js"><link rel="prefetch" href="/assets/js/77.3c1e294c.js"><link rel="prefetch" href="/assets/js/78.cfcd53d4.js"><link rel="prefetch" href="/assets/js/79.a50c96bd.js"><link rel="prefetch" href="/assets/js/8.68d2fe5c.js"><link rel="prefetch" href="/assets/js/80.8358bd99.js"><link rel="prefetch" href="/assets/js/81.754e7cd2.js"><link rel="prefetch" href="/assets/js/82.e42aff88.js"><link rel="prefetch" href="/assets/js/83.152a1582.js"><link rel="prefetch" href="/assets/js/84.4867883c.js"><link rel="prefetch" href="/assets/js/85.6b2afa69.js"><link rel="prefetch" href="/assets/js/86.3e058a7a.js"><link rel="prefetch" href="/assets/js/87.cf9a4fcf.js"><link rel="prefetch" href="/assets/js/88.dc32204f.js"><link rel="prefetch" href="/assets/js/89.fb10ca17.js"><link rel="prefetch" href="/assets/js/9.e4a451d3.js"><link rel="prefetch" href="/assets/js/90.7f184d9a.js"><link rel="prefetch" href="/assets/js/91.35f464f6.js"><link rel="prefetch" href="/assets/js/92.e45a3d68.js"><link rel="prefetch" href="/assets/js/93.0d192890.js"><link rel="prefetch" href="/assets/js/94.13f91cee.js"><link rel="prefetch" href="/assets/js/95.732898b6.js"><link rel="prefetch" href="/assets/js/96.10bfabc4.js"><link rel="prefetch" href="/assets/js/97.20f5d113.js"><link rel="prefetch" href="/assets/js/98.49efa8b4.js"><link rel="prefetch" href="/assets/js/99.9abce7a4.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.eff714eb.js">
    <link rel="stylesheet" href="/assets/css/0.styles.ccadf850.css">
  </head>
  <body>
    <div id="app" data-server-rendered="true"><div class="theme-container"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><img src="/img/logo.png" alt=" " class="logo"></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external">
  Wiki
  <!----></a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external">
  Foundation
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external">
  License
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external">
  Security
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external">
  Sponsorship
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external">
  Thanks
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external">
  Current Events
  <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/System Tools/Watermark Tool.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/System Tools/Watermark Tool.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link">
    gitHub
    <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></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><nav class="nav-links"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external">
  Wiki
  <!----></a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external">
  Foundation
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external">
  License
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external">
  Security
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external">
  Sponsorship
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external">
  Thanks
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external">
  Current Events
  <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/System Tools/Watermark Tool.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/System Tools/Watermark Tool.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link">
    gitHub
    <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 (V0.10.x)</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"><span>Concept</span> <span class="arrow right"></span></p> <!----></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 open"><span>System Tools</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.10.x/System Tools/Sync Tool.html" class="sidebar-link">Sync Tool</a></li><li><a href="/UserGuide/V0.10.x/System Tools/Memory Estimation Tool.html" class="sidebar-link">Memory Estimation Tool</a></li><li><a href="/UserGuide/V0.10.x/System Tools/JMX Tool.html" class="sidebar-link">JMX Tool</a></li><li><a href="/UserGuide/V0.10.x/System Tools/Watermark Tool.html" class="active sidebar-link">Watermark Tool</a></li><li><a href="/UserGuide/V0.10.x/System Tools/Query History Visualization Tool.html" class="sidebar-link">Query History Visualization Tool</a></li><li><a href="/UserGuide/V0.10.x/System Tools/Monitor and Log Tools.html" class="sidebar-link">Monitor and Log Tools</a></li><li><a href="/UserGuide/V0.10.x/System Tools/Load External Tsfile.html" class="sidebar-link">Load External Tsfile</a></li></ul></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></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="watermark-tool"><a href="#watermark-tool" class="header-anchor">#</a> Watermark Tool</h1> <p>This tool has two functions: 1) watermark embedding of the IoTDB query result and 2) watermark detection of the suspected data.</p> <h2 id="_1-watermark-embedding"><a href="#_1-watermark-embedding" class="header-anchor">#</a> 1. Watermark Embedding</h2> <h3 id="_1-1-configuration"><a href="#_1-1-configuration" class="header-anchor">#</a> 1.1 Configuration</h3> <p>Watermark is disabled by default in IoTDB. To enable watermark embedding, the first thing is to modify the following fields in the configuration file <code>iotdb-engine.properties</code>:</p> <table><thead><tr><th>Name</th> <th>Example</th> <th>Explanation</th></tr></thead> <tbody><tr><td>watermark_module_opened</td> <td>false</td> <td><code>true</code> to enable watermark embedding of the IoTDB server; <code>false</code> to disable</td></tr> <tr><td>watermark_secret_key</td> <td>IoTDB*2019@Beijing</td> <td>self-defined secret key</td></tr> <tr><td>watermark_bit_string</td> <td>100101110100</td> <td>0-1 bit string to be embedded</td></tr> <tr><td>watermark_method</td> <td>GroupBasedLSBMethod(embed_row_cycle=2,embed_lsb_num=5)</td> <td>specifies the watermark algorithm and its paramters</td></tr></tbody></table> <p>Notes:</p> <ul><li><code>watermark_module_opened</code>: Set it to be true if you want to enable watermark embedding</li> <li><code>watermark_secret_key</code>: Character '&amp;' is not allowed. There is no constraint on the length of the secret key. Generally, the longer the key is, the higher the bar to intruders.</li> <li><code>watermark_bit_string</code>: There is no constraint on the length of the bit string (except that it should not be empty). But note that it is difficult to reach the required significance level at the watermark detection phase if the bit string is way too short.</li> <li><code>watermark_method</code>: Now only GroupBasedLSBMethod is supported, so actually you can only tune the two parameters of this method, which are <code>embed_row_cycle</code> and <code>embed_lsb_num</code>.
<ul><li>Both of them should be positive integers.</li> <li><code>embed_row_cycle</code> controls the ratio of rows watermarked. The smaller the <code>embed_row_cycle</code>, the larger the ratio of rows watermarked. When <code>embed_row_cycle</code> equals 1, every row is watermarked.</li> <li>GroupBasedLSBMethod uses LSB embedding. <code>embed_lsb_num</code> controls the number of least significant bits available for watermark embedding. The biggger the <code>embed_lsb_num</code>, the larger the varying range of a data point.</li></ul></li> <li><code>watermark_secret_key</code>, <code>watermark_bit_string</code>  and <code>watermark_method</code> should be kept secret from possible attackers. That is, it is your responsiblity to take care of <code>iotdb-engine.properties</code>.</li></ul> <h3 id="_1-2-usage-example"><a href="#_1-2-usage-example" class="header-anchor">#</a> 1.2 Usage Example</h3> <h4 id="step-1-create-a-new-user-alice-grant-read-privilege-and-query"><a href="#step-1-create-a-new-user-alice-grant-read-privilege-and-query" class="header-anchor">#</a> step 1. Create a new user Alice, grant read privilege and query</h4> <p>A newly created user doesn't use watermark by default. So the query result is the original data.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>.\start-client.bat -u root -pw root
create user Alice 1234
grant user Alice privileges 'READ_TIMESERIES' on root.vehicle
exit

.\start-client.bat -u Alice -pw 1234
select * from root
+-----------------------------------+------------------+
|                               Time|root.vehicle.d0.s0|
+-----------------------------------+------------------+
|      1970-01-01T08:00:00.001+08:00|              21.5|
|      1970-01-01T08:00:00.002+08:00|              22.5|
|      1970-01-01T08:00:00.003+08:00|              23.5|
|      1970-01-01T08:00:00.004+08:00|              24.5|
|      1970-01-01T08:00:00.005+08:00|              25.5|
|      1970-01-01T08:00:00.006+08:00|              26.5|
|      1970-01-01T08:00:00.007+08:00|              27.5|
|      1970-01-01T08:00:00.008+08:00|              28.5|
|      1970-01-01T08:00:00.009+08:00|              29.5|
|      1970-01-01T08:00:00.010+08:00|              30.5|
|      1970-01-01T08:00:00.011+08:00|              31.5|
|      1970-01-01T08:00:00.012+08:00|              32.5|
|      1970-01-01T08:00:00.013+08:00|              33.5|
|      1970-01-01T08:00:00.014+08:00|              34.5|
|      1970-01-01T08:00:00.015+08:00|              35.5|
|      1970-01-01T08:00:00.016+08:00|              36.5|
|      1970-01-01T08:00:00.017+08:00|              37.5|
|      1970-01-01T08:00:00.018+08:00|              38.5|
|      1970-01-01T08:00:00.019+08:00|              39.5|
|      1970-01-01T08:00:00.020+08:00|              40.5|
|      1970-01-01T08:00:00.021+08:00|              41.5|
|      1970-01-01T08:00:00.022+08:00|              42.5|
|      1970-01-01T08:00:00.023+08:00|              43.5|
|      1970-01-01T08:00:00.024+08:00|              44.5|
|      1970-01-01T08:00:00.025+08:00|              45.5|
|      1970-01-01T08:00:00.026+08:00|              46.5|
|      1970-01-01T08:00:00.027+08:00|              47.5|
|      1970-01-01T08:00:00.028+08:00|              48.5|
|      1970-01-01T08:00:00.029+08:00|              49.5|
|      1970-01-01T08:00:00.030+08:00|              50.5|
|      1970-01-01T08:00:00.031+08:00|              51.5|
|      1970-01-01T08:00:00.032+08:00|              52.5|
|      1970-01-01T08:00:00.033+08:00|              53.5|
+-----------------------------------+------------------+
</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><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br></div></div><h4 id="step-2-grant-watermark-embedding-to-alice"><a href="#step-2-grant-watermark-embedding-to-alice" class="header-anchor">#</a> step 2. grant watermark_embedding to Alice</h4> <p>Usage: <code>grant watermark_embedding to Alice</code></p> <p>Note that you can use <code>grant watermark_embedding to user1,user2,...</code> to grant watermark_embedding to multiple users.</p> <p>Only root can run this command. After root grants watermark_embedding to Alice, all query results of Alice are watermarked.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>.\start-client.bat -u root -pw root
grant watermark_embedding to Alice
exit

.\start-client.bat -u Alice -pw 1234
select * from root
+-----------------------------------+------------------+
|                               Time|root.vehicle.d0.s0|
+-----------------------------------+------------------+
|      1970-01-01T08:00:00.001+08:00|              21.5|
|      1970-01-01T08:00:00.002+08:00|              22.5|
|      1970-01-01T08:00:00.003+08:00|         23.500008|
|      1970-01-01T08:00:00.004+08:00|         24.500015|
|      1970-01-01T08:00:00.005+08:00|              25.5|
|      1970-01-01T08:00:00.006+08:00|         26.500015|
|      1970-01-01T08:00:00.007+08:00|              27.5|
|      1970-01-01T08:00:00.008+08:00|         28.500004|
|      1970-01-01T08:00:00.009+08:00|              29.5|
|      1970-01-01T08:00:00.010+08:00|              30.5|
|      1970-01-01T08:00:00.011+08:00|              31.5|
|      1970-01-01T08:00:00.012+08:00|              32.5|
|      1970-01-01T08:00:00.013+08:00|              33.5|
|      1970-01-01T08:00:00.014+08:00|              34.5|
|      1970-01-01T08:00:00.015+08:00|         35.500004|
|      1970-01-01T08:00:00.016+08:00|              36.5|
|      1970-01-01T08:00:00.017+08:00|              37.5|
|      1970-01-01T08:00:00.018+08:00|              38.5|
|      1970-01-01T08:00:00.019+08:00|              39.5|
|      1970-01-01T08:00:00.020+08:00|              40.5|
|      1970-01-01T08:00:00.021+08:00|              41.5|
|      1970-01-01T08:00:00.022+08:00|         42.500015|
|      1970-01-01T08:00:00.023+08:00|              43.5|
|      1970-01-01T08:00:00.024+08:00|         44.500008|
|      1970-01-01T08:00:00.025+08:00|          45.50003|
|      1970-01-01T08:00:00.026+08:00|         46.500008|
|      1970-01-01T08:00:00.027+08:00|         47.500008|
|      1970-01-01T08:00:00.028+08:00|              48.5|
|      1970-01-01T08:00:00.029+08:00|              49.5|
|      1970-01-01T08:00:00.030+08:00|              50.5|
|      1970-01-01T08:00:00.031+08:00|         51.500008|
|      1970-01-01T08:00:00.032+08:00|              52.5|
|      1970-01-01T08:00:00.033+08:00|              53.5|
+-----------------------------------+------------------+
</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><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br></div></div><h4 id="step-3-revoke-watermark-embedding-from-alice"><a href="#step-3-revoke-watermark-embedding-from-alice" class="header-anchor">#</a> step 3. revoke watermark_embedding from Alice</h4> <p>Usage: <code>revoke watermark_embedding from Alice</code></p> <p>Note that you can use <code>revoke watermark_embedding from user1,user2,...</code> to revoke watermark_embedding from multiple users.</p> <p>Only root can run this command. After root revokes watermark_embedding from Alice, all query results of Alice are original again.</p> <h2 id="_2-watermark-detection"><a href="#_2-watermark-detection" class="header-anchor">#</a> 2. Watermark Detection</h2> <p><code>detect-watermark.sh</code> and <code>detect-watermark.bat</code> are provided for different platforms.</p> <p>Usage: ./detect-watermark.sh [filePath] [secretKey] [watermarkBitString] [embed_row_cycle] [embed_lsb_num] [alpha] [columnIndex] [dataType: int/float/double]</p> <p>Example: ./detect-watermark.sh /home/data/dump1.csv IoTDB*2019@Beijing 100101110100 2 5 0.05 1 float</p> <table><thead><tr><th>Args</th> <th>Example</th> <th>Explanation</th></tr></thead> <tbody><tr><td>filePath</td> <td>/home/data/dump1.csv</td> <td>suspected data file path</td></tr> <tr><td>secretKey</td> <td>IoTDB*2019@Beijing</td> <td>see watermark embedding section</td></tr> <tr><td>watermarkBitString</td> <td>100101110100</td> <td>see watermark embedding section</td></tr> <tr><td>embed_row_cycle</td> <td>2</td> <td>see watermark embedding section</td></tr> <tr><td>embed_lsb_num</td> <td>5</td> <td>see watermark embedding section</td></tr> <tr><td>alpha</td> <td>0.05</td> <td>significance level</td></tr> <tr><td>columnIndex</td> <td>1</td> <td>specifies one column of the data to detect</td></tr> <tr><td>dataType</td> <td>float</td> <td>specifies the data type of the detected column; int/float/double</td></tr></tbody></table> <p>Notes:</p> <ul><li><p><code>filePath</code>: You can use export-csv tool to generate such data file. The first row is header and the first column is time. Data in the file looks like this:</p> <table><thead><tr><th>Time</th> <th>root.vehicle.d0.s1</th> <th>root.vehicle.d0.s1</th></tr></thead> <tbody><tr><td>1970-01-01T08:00:00.001+08:00</td> <td>100</td> <td>null</td></tr> <tr><td>...</td> <td>...</td> <td>...</td></tr></tbody></table></li> <li><p><code>watermark_secret_key</code>, <code>watermark_bit_string</code>, <code>embed_row_cycle</code> and <code>embed_lsb_num</code> should be consistent with those used in the embedding phase.</p></li> <li><p><code>alpha</code>: It should be in the range of [0,1]. The watermark detection is based on the significance test. The smaller the <code>alpha</code> is, the lower the probability that the data without the watermark is detected to be watermark embedded, and thus the higher the credibility of the result of detecting the existence of the watermark in data.</p></li> <li><p><code>columnIndex</code>: It should be a postive integer.</p></li></ul></div> <div class="page-nav"><p class="inner"><span class="prev">
        ←
        <a href="/UserGuide/V0.10.x/System Tools/JMX Tool.html" class="prev">
          JMX Tool
        </a></span> <span class="next"><a href="/UserGuide/V0.10.x/System Tools/Query History Visualization Tool.html">
          Query History Visualization Tool
        </a>
        →
      </span></p></div> <p style="text-align: center;">Copyright © 2021 The Apache Software Foundation.<br>
     Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p> <p style="text-align: center; margin-top: 10px; color: #444">
    Contact us: Join QQ Group 659990460 | Add friend <i>tietouqiao</i> and be invited to Wechat Group<br>
    see <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> for more</p></main></div><div class="global-ui"></div></div>
    <script src="/assets/js/app.fe44b663.js" defer></script><script src="/assets/js/3.5626571b.js" defer></script><script src="/assets/js/152.7fbfa55b.js" defer></script>
  </body>
</html>