| <!DOCTYPE html> |
| <html lang="zh-CN"> |
| <head> |
| <meta charset="utf-8"> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <title> </title> |
| <meta name="generator" content="VuePress 1.7.1"> |
| <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.679f71b6.css" as="style"><link rel="preload" href="/assets/js/app.2ee94be6.js" as="script"><link rel="preload" href="/assets/js/3.49f0f20a.js" as="script"><link rel="preload" href="/assets/js/293.33a99011.js" as="script"><link rel="prefetch" href="/assets/js/10.a9e4399a.js"><link rel="prefetch" href="/assets/js/100.c0880a20.js"><link rel="prefetch" href="/assets/js/101.fe0e7944.js"><link rel="prefetch" href="/assets/js/102.bfeec1ea.js"><link rel="prefetch" href="/assets/js/103.df833354.js"><link rel="prefetch" href="/assets/js/104.52b56e9b.js"><link rel="prefetch" href="/assets/js/105.c452fad7.js"><link rel="prefetch" href="/assets/js/106.c7f8e134.js"><link rel="prefetch" href="/assets/js/107.73f1e6e7.js"><link rel="prefetch" href="/assets/js/108.73b9cb44.js"><link rel="prefetch" href="/assets/js/109.936fa5e2.js"><link rel="prefetch" href="/assets/js/11.1a825151.js"><link rel="prefetch" href="/assets/js/110.08b56333.js"><link rel="prefetch" href="/assets/js/111.16b3b8ce.js"><link rel="prefetch" href="/assets/js/112.7d64e61d.js"><link rel="prefetch" href="/assets/js/113.9e1dfbca.js"><link rel="prefetch" href="/assets/js/114.7fa3a420.js"><link rel="prefetch" href="/assets/js/115.7be20f31.js"><link rel="prefetch" href="/assets/js/116.2115555c.js"><link rel="prefetch" href="/assets/js/117.8de5b313.js"><link rel="prefetch" href="/assets/js/118.bc60a8b6.js"><link rel="prefetch" href="/assets/js/119.b09e6d45.js"><link rel="prefetch" href="/assets/js/12.4679de68.js"><link rel="prefetch" href="/assets/js/120.4eb5d98a.js"><link rel="prefetch" href="/assets/js/121.b655fb3e.js"><link rel="prefetch" href="/assets/js/122.6ec9e5df.js"><link rel="prefetch" href="/assets/js/123.b055439b.js"><link rel="prefetch" href="/assets/js/124.c39ed99b.js"><link rel="prefetch" href="/assets/js/125.50fb4f34.js"><link rel="prefetch" href="/assets/js/126.61e7cd95.js"><link rel="prefetch" href="/assets/js/127.36cf01e9.js"><link rel="prefetch" href="/assets/js/128.2ef18be0.js"><link rel="prefetch" href="/assets/js/129.e26e1c8b.js"><link rel="prefetch" href="/assets/js/13.a5c792cb.js"><link rel="prefetch" href="/assets/js/130.583ee181.js"><link rel="prefetch" href="/assets/js/131.618128f2.js"><link rel="prefetch" href="/assets/js/132.d2e87605.js"><link rel="prefetch" href="/assets/js/133.158d692a.js"><link rel="prefetch" href="/assets/js/134.747fe32f.js"><link rel="prefetch" href="/assets/js/135.9f003888.js"><link rel="prefetch" href="/assets/js/136.125a0a29.js"><link rel="prefetch" href="/assets/js/137.2a764086.js"><link rel="prefetch" href="/assets/js/138.e2387d2d.js"><link rel="prefetch" href="/assets/js/139.108f4bef.js"><link rel="prefetch" href="/assets/js/14.f2409887.js"><link rel="prefetch" href="/assets/js/140.e3c96566.js"><link rel="prefetch" href="/assets/js/141.dd46375d.js"><link rel="prefetch" href="/assets/js/142.0cc9637a.js"><link rel="prefetch" href="/assets/js/143.1214a32c.js"><link rel="prefetch" href="/assets/js/144.e9e9a183.js"><link rel="prefetch" href="/assets/js/145.c0e74f7f.js"><link rel="prefetch" href="/assets/js/146.4495534d.js"><link rel="prefetch" href="/assets/js/147.78f93758.js"><link rel="prefetch" href="/assets/js/148.40e92d63.js"><link rel="prefetch" href="/assets/js/149.83fed0f9.js"><link rel="prefetch" href="/assets/js/15.e2df8f28.js"><link rel="prefetch" href="/assets/js/150.e5bf8dc4.js"><link rel="prefetch" href="/assets/js/151.682152d6.js"><link rel="prefetch" href="/assets/js/152.d1ca9877.js"><link rel="prefetch" href="/assets/js/153.38d334e6.js"><link rel="prefetch" href="/assets/js/154.a573c85a.js"><link rel="prefetch" href="/assets/js/155.60f39805.js"><link rel="prefetch" href="/assets/js/156.163049df.js"><link rel="prefetch" href="/assets/js/157.a156ff6d.js"><link rel="prefetch" href="/assets/js/158.10f79629.js"><link rel="prefetch" href="/assets/js/159.5e4dfdd7.js"><link rel="prefetch" href="/assets/js/16.590590ab.js"><link rel="prefetch" href="/assets/js/160.fb6b6bc7.js"><link rel="prefetch" href="/assets/js/161.ff5105cc.js"><link rel="prefetch" href="/assets/js/162.6be64e21.js"><link rel="prefetch" href="/assets/js/163.56ca83d7.js"><link rel="prefetch" href="/assets/js/164.113484ca.js"><link rel="prefetch" href="/assets/js/165.b4eea724.js"><link rel="prefetch" href="/assets/js/166.ec59b713.js"><link rel="prefetch" href="/assets/js/167.ac1b5d5d.js"><link rel="prefetch" href="/assets/js/168.f9d31ebb.js"><link rel="prefetch" href="/assets/js/169.d6bbfab8.js"><link rel="prefetch" href="/assets/js/17.9ba04d92.js"><link rel="prefetch" href="/assets/js/170.a7293e43.js"><link rel="prefetch" href="/assets/js/171.73ee2733.js"><link rel="prefetch" href="/assets/js/172.bc4bfdba.js"><link rel="prefetch" href="/assets/js/173.4482496d.js"><link rel="prefetch" href="/assets/js/174.3888c8be.js"><link rel="prefetch" href="/assets/js/175.f5758eb3.js"><link rel="prefetch" href="/assets/js/176.1017ac43.js"><link rel="prefetch" href="/assets/js/177.9432ade8.js"><link rel="prefetch" href="/assets/js/178.2930c946.js"><link rel="prefetch" href="/assets/js/179.3612085b.js"><link rel="prefetch" href="/assets/js/18.10f1cf84.js"><link rel="prefetch" href="/assets/js/180.62bca70a.js"><link rel="prefetch" href="/assets/js/181.075dafa2.js"><link rel="prefetch" href="/assets/js/182.d412e464.js"><link rel="prefetch" href="/assets/js/183.00096674.js"><link rel="prefetch" href="/assets/js/184.8bb48176.js"><link rel="prefetch" href="/assets/js/185.858bcd43.js"><link rel="prefetch" href="/assets/js/186.08a697d5.js"><link rel="prefetch" href="/assets/js/187.e0da8267.js"><link rel="prefetch" href="/assets/js/188.1bc563de.js"><link rel="prefetch" href="/assets/js/189.419477f9.js"><link rel="prefetch" href="/assets/js/19.cfa08450.js"><link rel="prefetch" href="/assets/js/190.9ce4e1d7.js"><link rel="prefetch" href="/assets/js/191.faef024e.js"><link rel="prefetch" href="/assets/js/192.8be13d9c.js"><link rel="prefetch" href="/assets/js/193.8df4f2fa.js"><link rel="prefetch" href="/assets/js/194.ca9e00b8.js"><link rel="prefetch" href="/assets/js/195.49b338e7.js"><link rel="prefetch" href="/assets/js/196.8f944c9f.js"><link rel="prefetch" href="/assets/js/197.57267595.js"><link rel="prefetch" href="/assets/js/198.46856cf8.js"><link rel="prefetch" href="/assets/js/199.76a1d61f.js"><link rel="prefetch" href="/assets/js/20.63dff530.js"><link rel="prefetch" href="/assets/js/200.fbd3d814.js"><link rel="prefetch" href="/assets/js/201.d6d33e3d.js"><link rel="prefetch" href="/assets/js/202.dc85e449.js"><link rel="prefetch" href="/assets/js/203.7ba3eec1.js"><link rel="prefetch" href="/assets/js/204.c3e5700e.js"><link rel="prefetch" href="/assets/js/205.a15dd906.js"><link rel="prefetch" href="/assets/js/206.933745a9.js"><link rel="prefetch" href="/assets/js/207.1a957ff7.js"><link rel="prefetch" href="/assets/js/208.3c20a813.js"><link rel="prefetch" href="/assets/js/209.bb193ab8.js"><link rel="prefetch" href="/assets/js/21.851eb8b7.js"><link rel="prefetch" href="/assets/js/210.531c6c9d.js"><link rel="prefetch" href="/assets/js/211.fd00753d.js"><link rel="prefetch" href="/assets/js/212.d8b42270.js"><link rel="prefetch" href="/assets/js/213.de168e28.js"><link rel="prefetch" href="/assets/js/214.b5091de7.js"><link rel="prefetch" href="/assets/js/215.befd3201.js"><link rel="prefetch" href="/assets/js/216.f227eae9.js"><link rel="prefetch" href="/assets/js/217.84e91829.js"><link rel="prefetch" href="/assets/js/218.1c6744f8.js"><link rel="prefetch" href="/assets/js/219.aef65258.js"><link rel="prefetch" href="/assets/js/22.ab7a2af8.js"><link rel="prefetch" href="/assets/js/220.1fb41856.js"><link rel="prefetch" href="/assets/js/221.cec4c756.js"><link rel="prefetch" href="/assets/js/222.a346f7f6.js"><link rel="prefetch" href="/assets/js/223.9a85fe4d.js"><link rel="prefetch" href="/assets/js/224.33b19919.js"><link rel="prefetch" href="/assets/js/225.3549d2e4.js"><link rel="prefetch" href="/assets/js/226.8d440b93.js"><link rel="prefetch" href="/assets/js/227.d1787387.js"><link rel="prefetch" href="/assets/js/228.9246beea.js"><link rel="prefetch" href="/assets/js/229.35fd7280.js"><link rel="prefetch" href="/assets/js/23.88a22028.js"><link rel="prefetch" href="/assets/js/230.343945f0.js"><link rel="prefetch" href="/assets/js/231.0f61fc67.js"><link rel="prefetch" href="/assets/js/232.09d3dfc2.js"><link rel="prefetch" href="/assets/js/233.89ddea46.js"><link rel="prefetch" href="/assets/js/234.f208ac73.js"><link rel="prefetch" href="/assets/js/235.29e93b26.js"><link rel="prefetch" href="/assets/js/236.7e237f16.js"><link rel="prefetch" href="/assets/js/237.6a73933f.js"><link rel="prefetch" href="/assets/js/238.d49e7876.js"><link rel="prefetch" href="/assets/js/239.b2742cff.js"><link rel="prefetch" href="/assets/js/24.2a2c516a.js"><link rel="prefetch" href="/assets/js/240.3d4ffc19.js"><link rel="prefetch" href="/assets/js/241.6d6149e4.js"><link rel="prefetch" href="/assets/js/242.48d58be9.js"><link rel="prefetch" href="/assets/js/243.99da6819.js"><link rel="prefetch" href="/assets/js/244.cf002d52.js"><link rel="prefetch" href="/assets/js/245.c255dd47.js"><link rel="prefetch" href="/assets/js/246.172ad322.js"><link rel="prefetch" href="/assets/js/247.c57a9fd5.js"><link rel="prefetch" href="/assets/js/248.3b80d22f.js"><link rel="prefetch" href="/assets/js/249.faae6988.js"><link rel="prefetch" href="/assets/js/25.f4708e51.js"><link rel="prefetch" href="/assets/js/250.af34839c.js"><link rel="prefetch" href="/assets/js/251.e3303cb3.js"><link rel="prefetch" href="/assets/js/252.ab2df332.js"><link rel="prefetch" href="/assets/js/253.97b8feff.js"><link rel="prefetch" href="/assets/js/254.a7e144f0.js"><link rel="prefetch" href="/assets/js/255.47b22290.js"><link rel="prefetch" href="/assets/js/256.f3fc3c5c.js"><link rel="prefetch" href="/assets/js/257.7fe6f524.js"><link rel="prefetch" href="/assets/js/258.4828e319.js"><link rel="prefetch" href="/assets/js/259.99325651.js"><link rel="prefetch" href="/assets/js/26.81ae73cb.js"><link rel="prefetch" href="/assets/js/260.f6e7777c.js"><link rel="prefetch" href="/assets/js/261.849bf2c2.js"><link rel="prefetch" href="/assets/js/262.b3894c8b.js"><link rel="prefetch" href="/assets/js/263.2ebeca81.js"><link rel="prefetch" href="/assets/js/264.b553e943.js"><link rel="prefetch" href="/assets/js/265.dae42b1d.js"><link rel="prefetch" href="/assets/js/266.714de63a.js"><link rel="prefetch" href="/assets/js/267.3656f797.js"><link rel="prefetch" href="/assets/js/268.e8f93cb7.js"><link rel="prefetch" href="/assets/js/269.bc95a278.js"><link rel="prefetch" href="/assets/js/27.0b57c820.js"><link rel="prefetch" href="/assets/js/270.f5b334a4.js"><link rel="prefetch" href="/assets/js/271.4bd2e795.js"><link rel="prefetch" href="/assets/js/272.2f2d3b8e.js"><link rel="prefetch" href="/assets/js/273.03dca16b.js"><link rel="prefetch" href="/assets/js/274.b89d6288.js"><link rel="prefetch" href="/assets/js/275.e1865bc1.js"><link rel="prefetch" href="/assets/js/276.cef75513.js"><link rel="prefetch" href="/assets/js/277.241bd20a.js"><link rel="prefetch" href="/assets/js/278.9a35b7c2.js"><link rel="prefetch" href="/assets/js/279.50ac2212.js"><link rel="prefetch" href="/assets/js/28.902cf242.js"><link rel="prefetch" href="/assets/js/280.d10cfd5b.js"><link rel="prefetch" href="/assets/js/281.c2c5ef73.js"><link rel="prefetch" href="/assets/js/282.0a8294a5.js"><link rel="prefetch" href="/assets/js/283.61b4efac.js"><link rel="prefetch" href="/assets/js/284.92cf6f87.js"><link rel="prefetch" href="/assets/js/285.774c8bff.js"><link rel="prefetch" href="/assets/js/286.b512efc4.js"><link rel="prefetch" href="/assets/js/287.0ef6b466.js"><link rel="prefetch" href="/assets/js/288.ea566e9e.js"><link rel="prefetch" href="/assets/js/289.24932bb7.js"><link rel="prefetch" href="/assets/js/29.8878a84b.js"><link rel="prefetch" href="/assets/js/290.d9e5f373.js"><link rel="prefetch" href="/assets/js/291.c3aa7523.js"><link rel="prefetch" href="/assets/js/292.ccda2693.js"><link rel="prefetch" href="/assets/js/294.7e185d14.js"><link rel="prefetch" href="/assets/js/295.995c3829.js"><link rel="prefetch" href="/assets/js/296.43120e6c.js"><link rel="prefetch" href="/assets/js/297.03e327e1.js"><link rel="prefetch" href="/assets/js/298.5fbd4ba9.js"><link rel="prefetch" href="/assets/js/299.c55bd458.js"><link rel="prefetch" href="/assets/js/30.144a5c6c.js"><link rel="prefetch" href="/assets/js/300.eaba348a.js"><link rel="prefetch" href="/assets/js/301.40634cc4.js"><link rel="prefetch" href="/assets/js/302.b9b5e0de.js"><link rel="prefetch" href="/assets/js/303.3975d83a.js"><link rel="prefetch" href="/assets/js/304.02b24cfb.js"><link rel="prefetch" href="/assets/js/305.2fcdd0bd.js"><link rel="prefetch" href="/assets/js/306.9c517963.js"><link rel="prefetch" href="/assets/js/307.2a77c8a9.js"><link rel="prefetch" href="/assets/js/308.9d7acc5b.js"><link rel="prefetch" href="/assets/js/309.f0e46861.js"><link rel="prefetch" href="/assets/js/31.03034f21.js"><link rel="prefetch" href="/assets/js/310.8be7df64.js"><link rel="prefetch" href="/assets/js/311.d0203c5f.js"><link rel="prefetch" href="/assets/js/312.77223620.js"><link rel="prefetch" href="/assets/js/313.361474e1.js"><link rel="prefetch" href="/assets/js/314.dca1de82.js"><link rel="prefetch" href="/assets/js/315.7c0d34c3.js"><link rel="prefetch" href="/assets/js/316.0c950fac.js"><link rel="prefetch" href="/assets/js/317.c11ca215.js"><link rel="prefetch" href="/assets/js/318.125eeb05.js"><link rel="prefetch" href="/assets/js/319.fa772c20.js"><link rel="prefetch" href="/assets/js/32.8f05a31d.js"><link rel="prefetch" href="/assets/js/320.b9f91468.js"><link rel="prefetch" href="/assets/js/321.b30a0ff7.js"><link rel="prefetch" href="/assets/js/322.a2450e56.js"><link rel="prefetch" href="/assets/js/323.1c768a77.js"><link rel="prefetch" href="/assets/js/324.b90da6d6.js"><link rel="prefetch" href="/assets/js/325.3be8d1aa.js"><link rel="prefetch" href="/assets/js/326.0ceba341.js"><link rel="prefetch" href="/assets/js/327.f49f9dd3.js"><link rel="prefetch" href="/assets/js/328.a76af63e.js"><link rel="prefetch" href="/assets/js/329.2cf81867.js"><link rel="prefetch" href="/assets/js/33.8ab920f1.js"><link rel="prefetch" href="/assets/js/330.e58bfbdf.js"><link rel="prefetch" href="/assets/js/331.831bac21.js"><link rel="prefetch" href="/assets/js/332.0bf75b93.js"><link rel="prefetch" href="/assets/js/333.f745b4ff.js"><link rel="prefetch" href="/assets/js/334.ac913ef5.js"><link rel="prefetch" href="/assets/js/335.b74badca.js"><link rel="prefetch" href="/assets/js/336.6106538b.js"><link rel="prefetch" href="/assets/js/337.ea8aa400.js"><link rel="prefetch" href="/assets/js/338.4089f17d.js"><link rel="prefetch" href="/assets/js/339.0e1ef72b.js"><link rel="prefetch" href="/assets/js/34.44ac5494.js"><link rel="prefetch" href="/assets/js/340.1e4b4949.js"><link rel="prefetch" href="/assets/js/341.626acd05.js"><link rel="prefetch" href="/assets/js/342.f964d055.js"><link rel="prefetch" href="/assets/js/343.fd274150.js"><link rel="prefetch" href="/assets/js/344.fe5cd97c.js"><link rel="prefetch" href="/assets/js/345.388e2377.js"><link rel="prefetch" href="/assets/js/346.33f827d5.js"><link rel="prefetch" href="/assets/js/347.ac0f7d1f.js"><link rel="prefetch" href="/assets/js/348.55a24b1f.js"><link rel="prefetch" href="/assets/js/349.24d96653.js"><link rel="prefetch" href="/assets/js/35.7f32ce73.js"><link rel="prefetch" href="/assets/js/350.bdc7aeb4.js"><link rel="prefetch" href="/assets/js/351.73f0ec56.js"><link rel="prefetch" href="/assets/js/352.b2a7ef72.js"><link rel="prefetch" href="/assets/js/353.0a675356.js"><link rel="prefetch" href="/assets/js/354.09076830.js"><link rel="prefetch" href="/assets/js/355.b7825939.js"><link rel="prefetch" href="/assets/js/356.0f8c88cc.js"><link rel="prefetch" href="/assets/js/357.1650fb7b.js"><link rel="prefetch" href="/assets/js/358.553f1895.js"><link rel="prefetch" href="/assets/js/359.4a142a9f.js"><link rel="prefetch" href="/assets/js/36.be67eb6c.js"><link rel="prefetch" href="/assets/js/360.8c0b9057.js"><link rel="prefetch" href="/assets/js/361.9422cf00.js"><link rel="prefetch" href="/assets/js/362.d25931e0.js"><link rel="prefetch" href="/assets/js/363.3bbb2f09.js"><link rel="prefetch" href="/assets/js/364.54c7d139.js"><link rel="prefetch" href="/assets/js/365.543f0cd8.js"><link rel="prefetch" href="/assets/js/366.4367f640.js"><link rel="prefetch" href="/assets/js/367.ab903303.js"><link rel="prefetch" href="/assets/js/368.df3952bb.js"><link rel="prefetch" href="/assets/js/369.25b6b663.js"><link rel="prefetch" href="/assets/js/37.c72b6907.js"><link rel="prefetch" href="/assets/js/370.348a43fd.js"><link rel="prefetch" href="/assets/js/371.c10d905a.js"><link rel="prefetch" href="/assets/js/372.967bc3e0.js"><link rel="prefetch" href="/assets/js/373.20a2bde1.js"><link rel="prefetch" href="/assets/js/374.1f6ed201.js"><link rel="prefetch" href="/assets/js/375.d74ded97.js"><link rel="prefetch" href="/assets/js/376.b5a39d89.js"><link rel="prefetch" href="/assets/js/377.aaa95bcd.js"><link rel="prefetch" href="/assets/js/378.276d09c8.js"><link rel="prefetch" href="/assets/js/379.98587ca7.js"><link rel="prefetch" href="/assets/js/38.2334aea2.js"><link rel="prefetch" href="/assets/js/380.072826ba.js"><link rel="prefetch" href="/assets/js/381.6367c284.js"><link rel="prefetch" href="/assets/js/382.ba67daf9.js"><link rel="prefetch" href="/assets/js/383.7e98022d.js"><link rel="prefetch" href="/assets/js/384.1358fbd0.js"><link rel="prefetch" href="/assets/js/385.9a3bdf8f.js"><link rel="prefetch" href="/assets/js/386.e8c15d4a.js"><link rel="prefetch" href="/assets/js/387.3f7781da.js"><link rel="prefetch" href="/assets/js/388.a28d59e8.js"><link rel="prefetch" href="/assets/js/389.d70d34ac.js"><link rel="prefetch" href="/assets/js/39.683bc07a.js"><link rel="prefetch" href="/assets/js/390.d0e96c54.js"><link rel="prefetch" href="/assets/js/391.a19d5823.js"><link rel="prefetch" href="/assets/js/392.28382439.js"><link rel="prefetch" href="/assets/js/393.186c2c77.js"><link rel="prefetch" href="/assets/js/394.f1a21aeb.js"><link rel="prefetch" href="/assets/js/395.8f23b199.js"><link rel="prefetch" href="/assets/js/396.bbc57301.js"><link rel="prefetch" href="/assets/js/397.030982be.js"><link rel="prefetch" href="/assets/js/398.7504ee54.js"><link rel="prefetch" href="/assets/js/399.26af53a1.js"><link rel="prefetch" href="/assets/js/4.06d2a3f5.js"><link rel="prefetch" href="/assets/js/40.829e9e65.js"><link rel="prefetch" href="/assets/js/400.6dbc2192.js"><link rel="prefetch" href="/assets/js/401.3aae5fae.js"><link rel="prefetch" href="/assets/js/402.f3a42f28.js"><link rel="prefetch" href="/assets/js/403.55bc079e.js"><link rel="prefetch" href="/assets/js/404.a39c3fee.js"><link rel="prefetch" href="/assets/js/405.83f6961a.js"><link rel="prefetch" href="/assets/js/406.11f70cce.js"><link rel="prefetch" href="/assets/js/407.69a823e2.js"><link rel="prefetch" href="/assets/js/408.64168e39.js"><link rel="prefetch" href="/assets/js/409.39986fe2.js"><link rel="prefetch" href="/assets/js/41.ae8c3e94.js"><link rel="prefetch" href="/assets/js/410.d3d7fce4.js"><link rel="prefetch" href="/assets/js/411.1f6402d1.js"><link rel="prefetch" href="/assets/js/412.896aee78.js"><link rel="prefetch" href="/assets/js/413.5957daba.js"><link rel="prefetch" href="/assets/js/414.5e05b986.js"><link rel="prefetch" href="/assets/js/415.38e08c2a.js"><link rel="prefetch" href="/assets/js/416.6d6973ed.js"><link rel="prefetch" href="/assets/js/417.30fd8e24.js"><link rel="prefetch" href="/assets/js/418.c297ee7a.js"><link rel="prefetch" href="/assets/js/419.d621bb5d.js"><link rel="prefetch" href="/assets/js/42.45821720.js"><link rel="prefetch" href="/assets/js/420.9bbeac2a.js"><link rel="prefetch" href="/assets/js/421.8c919d48.js"><link rel="prefetch" href="/assets/js/422.c5f8a551.js"><link rel="prefetch" href="/assets/js/423.1fb6b2d5.js"><link rel="prefetch" href="/assets/js/424.ab610f02.js"><link rel="prefetch" href="/assets/js/425.c86176fc.js"><link rel="prefetch" href="/assets/js/426.3775cf11.js"><link rel="prefetch" href="/assets/js/427.06cbe3f9.js"><link rel="prefetch" href="/assets/js/428.1fcd3b3b.js"><link rel="prefetch" href="/assets/js/429.5cea0f19.js"><link rel="prefetch" href="/assets/js/43.bd27e7b5.js"><link rel="prefetch" href="/assets/js/430.0fa95fd2.js"><link rel="prefetch" href="/assets/js/431.6802bf93.js"><link rel="prefetch" href="/assets/js/432.c91272f8.js"><link rel="prefetch" href="/assets/js/433.89a55e39.js"><link rel="prefetch" href="/assets/js/434.8dbdd489.js"><link rel="prefetch" href="/assets/js/435.6e3bd07f.js"><link rel="prefetch" href="/assets/js/436.eec57805.js"><link rel="prefetch" href="/assets/js/437.d772b594.js"><link rel="prefetch" href="/assets/js/438.e51e3319.js"><link rel="prefetch" href="/assets/js/439.fce2edab.js"><link rel="prefetch" href="/assets/js/44.e0cd7e7b.js"><link rel="prefetch" href="/assets/js/440.333a51d4.js"><link rel="prefetch" href="/assets/js/441.3bce664b.js"><link rel="prefetch" href="/assets/js/442.c34a59ce.js"><link rel="prefetch" href="/assets/js/443.7e468d0b.js"><link rel="prefetch" href="/assets/js/444.dd4b1814.js"><link rel="prefetch" href="/assets/js/445.c630e832.js"><link rel="prefetch" href="/assets/js/446.08015418.js"><link rel="prefetch" href="/assets/js/447.6f6b9988.js"><link rel="prefetch" href="/assets/js/448.a0fb6385.js"><link rel="prefetch" href="/assets/js/449.002c690b.js"><link rel="prefetch" href="/assets/js/45.fa02a8c0.js"><link rel="prefetch" href="/assets/js/450.16eaed86.js"><link rel="prefetch" href="/assets/js/451.7f5cb30f.js"><link rel="prefetch" href="/assets/js/452.487546cd.js"><link rel="prefetch" href="/assets/js/453.0267cdbf.js"><link rel="prefetch" href="/assets/js/454.7e89eb47.js"><link rel="prefetch" href="/assets/js/455.d21c5410.js"><link rel="prefetch" href="/assets/js/456.dc71ee50.js"><link rel="prefetch" href="/assets/js/457.47d1842a.js"><link rel="prefetch" href="/assets/js/458.7fa36be1.js"><link rel="prefetch" href="/assets/js/459.0aac2ce5.js"><link rel="prefetch" href="/assets/js/46.cfcdcea2.js"><link rel="prefetch" href="/assets/js/460.beb14272.js"><link rel="prefetch" href="/assets/js/461.afb1c4cb.js"><link rel="prefetch" href="/assets/js/462.d5664c9b.js"><link rel="prefetch" href="/assets/js/463.8bf7d1d8.js"><link rel="prefetch" href="/assets/js/464.dcaaabc9.js"><link rel="prefetch" href="/assets/js/465.9865dd17.js"><link rel="prefetch" href="/assets/js/466.98ffd234.js"><link rel="prefetch" href="/assets/js/467.3596c452.js"><link rel="prefetch" href="/assets/js/468.31cb0821.js"><link rel="prefetch" href="/assets/js/469.3c226943.js"><link rel="prefetch" href="/assets/js/47.2c60b5b2.js"><link rel="prefetch" href="/assets/js/470.bfbc6391.js"><link rel="prefetch" href="/assets/js/471.fbafb68b.js"><link rel="prefetch" href="/assets/js/472.1ebbe04c.js"><link rel="prefetch" href="/assets/js/473.ad568006.js"><link rel="prefetch" href="/assets/js/474.e0398f59.js"><link rel="prefetch" href="/assets/js/475.c3eb4bf4.js"><link rel="prefetch" href="/assets/js/476.635aba22.js"><link rel="prefetch" href="/assets/js/477.c548a4c4.js"><link rel="prefetch" href="/assets/js/478.396635e5.js"><link rel="prefetch" href="/assets/js/479.280dedcb.js"><link rel="prefetch" href="/assets/js/48.d24599f6.js"><link rel="prefetch" href="/assets/js/480.90c2b1ca.js"><link rel="prefetch" href="/assets/js/481.60d45032.js"><link rel="prefetch" href="/assets/js/482.1f68aca9.js"><link rel="prefetch" href="/assets/js/483.55e47bf4.js"><link rel="prefetch" href="/assets/js/484.e46c8967.js"><link rel="prefetch" href="/assets/js/485.ab051357.js"><link rel="prefetch" href="/assets/js/486.28b4de3f.js"><link rel="prefetch" href="/assets/js/487.fb1dfe76.js"><link rel="prefetch" href="/assets/js/488.3ac44db2.js"><link rel="prefetch" href="/assets/js/489.d89fd855.js"><link rel="prefetch" href="/assets/js/49.3de3d3a7.js"><link rel="prefetch" href="/assets/js/490.adee2681.js"><link rel="prefetch" href="/assets/js/491.f398cc80.js"><link rel="prefetch" href="/assets/js/492.72c00577.js"><link rel="prefetch" href="/assets/js/493.cb94276f.js"><link rel="prefetch" href="/assets/js/494.b8246841.js"><link rel="prefetch" href="/assets/js/495.16c14c26.js"><link rel="prefetch" href="/assets/js/496.9467835e.js"><link rel="prefetch" href="/assets/js/497.60af40d7.js"><link rel="prefetch" href="/assets/js/498.61b545f9.js"><link rel="prefetch" href="/assets/js/499.6d488fd4.js"><link rel="prefetch" href="/assets/js/5.33db7f08.js"><link rel="prefetch" href="/assets/js/50.27055b53.js"><link rel="prefetch" href="/assets/js/500.1b71f590.js"><link rel="prefetch" href="/assets/js/501.e940222f.js"><link rel="prefetch" href="/assets/js/502.addeafa0.js"><link rel="prefetch" href="/assets/js/503.b87275e9.js"><link rel="prefetch" href="/assets/js/504.55e82de2.js"><link rel="prefetch" href="/assets/js/505.166dab85.js"><link rel="prefetch" href="/assets/js/506.00e96d9c.js"><link rel="prefetch" href="/assets/js/507.239a1650.js"><link rel="prefetch" href="/assets/js/508.f360fdee.js"><link rel="prefetch" href="/assets/js/509.0e831bf6.js"><link rel="prefetch" href="/assets/js/51.08fc9992.js"><link rel="prefetch" href="/assets/js/510.3181ee34.js"><link rel="prefetch" href="/assets/js/511.8b29392c.js"><link rel="prefetch" href="/assets/js/512.65dc78dd.js"><link rel="prefetch" href="/assets/js/513.bdfc09f4.js"><link rel="prefetch" href="/assets/js/514.b8545b0a.js"><link rel="prefetch" href="/assets/js/515.06b62785.js"><link rel="prefetch" href="/assets/js/516.18555b03.js"><link rel="prefetch" href="/assets/js/517.9f3641fe.js"><link rel="prefetch" href="/assets/js/518.fb028a47.js"><link rel="prefetch" href="/assets/js/519.81cf792a.js"><link rel="prefetch" href="/assets/js/52.018b3127.js"><link rel="prefetch" href="/assets/js/520.64cf0e4f.js"><link rel="prefetch" href="/assets/js/521.f0b50c7c.js"><link rel="prefetch" href="/assets/js/522.0ee533fc.js"><link rel="prefetch" href="/assets/js/523.06d138f1.js"><link rel="prefetch" href="/assets/js/524.1d051ca5.js"><link rel="prefetch" href="/assets/js/525.6b2c9928.js"><link rel="prefetch" href="/assets/js/53.926cbc9b.js"><link rel="prefetch" href="/assets/js/54.282e9e35.js"><link rel="prefetch" href="/assets/js/55.8aa2cf33.js"><link rel="prefetch" href="/assets/js/56.9a4735e6.js"><link rel="prefetch" href="/assets/js/57.3ffbf205.js"><link rel="prefetch" href="/assets/js/58.f93f9595.js"><link rel="prefetch" href="/assets/js/59.2121c943.js"><link rel="prefetch" href="/assets/js/6.d37d398a.js"><link rel="prefetch" href="/assets/js/60.2d67bc6c.js"><link rel="prefetch" href="/assets/js/61.c44ac685.js"><link rel="prefetch" href="/assets/js/62.12596064.js"><link rel="prefetch" href="/assets/js/63.72f9f061.js"><link rel="prefetch" href="/assets/js/64.78c508ed.js"><link rel="prefetch" href="/assets/js/65.25acd8ac.js"><link rel="prefetch" href="/assets/js/66.cc56a955.js"><link rel="prefetch" href="/assets/js/67.3d95afce.js"><link rel="prefetch" href="/assets/js/68.05fa411c.js"><link rel="prefetch" href="/assets/js/69.69962e06.js"><link rel="prefetch" href="/assets/js/7.8c733af6.js"><link rel="prefetch" href="/assets/js/70.059cdd51.js"><link rel="prefetch" href="/assets/js/71.0c9d3b74.js"><link rel="prefetch" href="/assets/js/72.3ffd02d2.js"><link rel="prefetch" href="/assets/js/73.25916778.js"><link rel="prefetch" href="/assets/js/74.41363885.js"><link rel="prefetch" href="/assets/js/75.70de16ad.js"><link rel="prefetch" href="/assets/js/76.06e76fe6.js"><link rel="prefetch" href="/assets/js/77.2416667e.js"><link rel="prefetch" href="/assets/js/78.2f07e42d.js"><link rel="prefetch" href="/assets/js/79.994c527d.js"><link rel="prefetch" href="/assets/js/8.ab03c33c.js"><link rel="prefetch" href="/assets/js/80.95389c9b.js"><link rel="prefetch" href="/assets/js/81.1858fc7e.js"><link rel="prefetch" href="/assets/js/82.ff5479e3.js"><link rel="prefetch" href="/assets/js/83.0d8232c4.js"><link rel="prefetch" href="/assets/js/84.13db35cf.js"><link rel="prefetch" href="/assets/js/85.37568ceb.js"><link rel="prefetch" href="/assets/js/86.48d44393.js"><link rel="prefetch" href="/assets/js/87.448dc2e9.js"><link rel="prefetch" href="/assets/js/88.325c42b1.js"><link rel="prefetch" href="/assets/js/89.0532fdad.js"><link rel="prefetch" href="/assets/js/9.fda181fa.js"><link rel="prefetch" href="/assets/js/90.b79baf47.js"><link rel="prefetch" href="/assets/js/91.bc5b8eb2.js"><link rel="prefetch" href="/assets/js/92.e0783e23.js"><link rel="prefetch" href="/assets/js/93.938bb469.js"><link rel="prefetch" href="/assets/js/94.a025f6e1.js"><link rel="prefetch" href="/assets/js/95.afc145ea.js"><link rel="prefetch" href="/assets/js/96.b99544b9.js"><link rel="prefetch" href="/assets/js/97.50f0803b.js"><link rel="prefetch" href="/assets/js/98.2284725e.js"><link rel="prefetch" href="/assets/js/99.e4d92dc9.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.262891fb.js"> |
| <link rel="stylesheet" href="/assets/css/0.styles.679f71b6.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="/zh/" 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">文档</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/zh/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="/zh/SystemDesign/Architecture/Architecture.html" class="nav-link">系统设计</a></div><div class="nav-item"><a href="/zh/Download/" class="nav-link">下载</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">社区</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="/zh/Community/Community-Project Committers.html" class="nav-link">开发人员</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Community-Powered By.html" class="nav-link">技术支持</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Materials.html" class="nav-link">活动与报告</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Feedback.html" class="nav-link">交流与反馈</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">开发</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/Development/VoteRelease.html" class="nav-link">如何投票</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/HowToCommit.html" class="nav-link">如何提交代码</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/Committer.html" class="nav-link">成为Committer</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/ContributeGuide.html" class="nav-link">项目开发指南</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/format-changelist.html" class="nav-link">TsFile的更改列表</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/rpc-changelist.html" class="nav-link">RPC变更清单</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"> |
| 基金会 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| 许可证 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| 安全 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| 赞助 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| 致谢 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| 活动 |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">语言</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/SystemDesign/DataQuery/OrderByTimeQuery.html" aria-current="page" class="nav-link router-link-exact-active router-link-active">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">文档</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/zh/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="/zh/SystemDesign/Architecture/Architecture.html" class="nav-link">系统设计</a></div><div class="nav-item"><a href="/zh/Download/" class="nav-link">下载</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">社区</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="/zh/Community/Community-Project Committers.html" class="nav-link">开发人员</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Community-Powered By.html" class="nav-link">技术支持</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Materials.html" class="nav-link">活动与报告</a></li><li class="dropdown-item"><!----> <a href="/zh/Community/Feedback.html" class="nav-link">交流与反馈</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">开发</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/zh/Development/VoteRelease.html" class="nav-link">如何投票</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/HowToCommit.html" class="nav-link">如何提交代码</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/Committer.html" class="nav-link">成为Committer</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/ContributeGuide.html" class="nav-link">项目开发指南</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/format-changelist.html" class="nav-link">TsFile的更改列表</a></li><li class="dropdown-item"><!----> <a href="/zh/Development/rpc-changelist.html" class="nav-link">RPC变更清单</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"> |
| 基金会 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external"> |
| 许可证 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external"> |
| 安全 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external"> |
| 赞助 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external"> |
| 致谢 |
| <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external"> |
| 活动 |
| <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">语言</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/SystemDesign/DataQuery/OrderByTimeQuery.html" aria-current="page" class="nav-link router-link-exact-active router-link-active">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>系统设计</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>应用概览</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TsFile</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>查询引擎</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>元数据管理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>存储引擎</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>数据查询</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/SystemDesign/DataQuery/DataQuery.html" class="sidebar-link">数据查询</a></li><li><a href="/zh/SystemDesign/DataQuery/QueryFundamentals.html" class="sidebar-link">查询基础介绍</a></li><li><a href="/zh/SystemDesign/DataQuery/SeriesReader.html" class="sidebar-link">查询基础组件</a></li><li><a href="/zh/SystemDesign/DataQuery/RawDataQuery.html" class="sidebar-link">原始数据查询</a></li><li><a href="/zh/SystemDesign/DataQuery/AggregationQuery.html" class="sidebar-link">聚合查询</a></li><li><a href="/zh/SystemDesign/DataQuery/GroupByQuery.html" class="sidebar-link">降采样查询</a></li><li><a href="/zh/SystemDesign/DataQuery/LastQuery.html" class="sidebar-link">最近时间戳 Last 查询</a></li><li><a href="/zh/SystemDesign/DataQuery/AlignByDeviceQuery.html" class="sidebar-link">按设备对齐查询</a></li><li><a href="/zh/SystemDesign/DataQuery/FillFunction.html" class="sidebar-link">空值填充</a></li><li><a href="/zh/SystemDesign/DataQuery/GroupByFillQuery.html" class="sidebar-link">降采样补空值查询</a></li><li><a href="/zh/SystemDesign/DataQuery/OrderByTimeQuery.html" aria-current="page" class="active sidebar-link">按时间倒序查询</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>连接器</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></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="按时间倒序查询"><a href="#按时间倒序查询" class="header-anchor">#</a> 按时间倒序查询</h1> <h2 id="实现原理"><a href="#实现原理" class="header-anchor">#</a> 实现原理</h2> <p>倒序分为 3 个维度来实现，由内核层到用户层分别为: <code>TsFile</code>、<code>BatchData</code>、<code>数据集</code>.</p> <ol><li><code>TsFile</code> 是用来存储所有原始数据的文件格式，在存储时分为 <code>顺序文件</code> 和 <code>乱序文件</code>. |
| <code>ChunkData</code> 是 <code>TsFile</code> 中的基本数据块，保存了具体某一个测点的数据，且<strong>数据是按照时间升序存储的</strong>.</li> <li><code>BatchData</code> 是基础数据交换结构，无论是从文件系统还是缓存读出的数据都会被转换成 <code>BatchData</code> 结构.</li> <li><code>数据集</code> 是封装根据用户输入的 <code>SQL</code> 语句的结果集格式，转换和封装 <code>BatchData</code> 中的数据。</li></ol> <p>实际系统需要考虑的方面会更多，但主要为以上 3 点。 |
| 下面分别介绍各个层面如何实现基于时间的倒序查询:</p> <h2 id="tsfile"><a href="#tsfile" class="header-anchor">#</a> TsFile</h2> <p>1.<code>TsFile</code> 在文件末尾存储了各个测点在文件中的最小时间(开始时间)和最大时间(结束时间)， |
| 所以当我们按照开始时间升序排列文件并读取数据时,是升序读取;当使用结束时间倒序排列文件 |
| (<strong>顺序文件也可以使用开始时间倒序排列</strong>)并读取数据时,是<strong>伪倒序读取</strong>(因为文件内依然是升序存储的),数据示例:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> 按照开始时间升序排列 (1,6) |
| +---TsFile1---+ +---TsFile2---+ |
| | 1,2,3,4,5 | | 6,7,8,9,10 | |
| +-------------+ +-------------+ |
| |
| 按照结束降序排列 (10,5) |
| +---TsFile2---+ +---TsFile1---+ |
| | 6,7,8,9,10 | | 1,2,3,4,5 | |
| +-------------+ +-------------+ |
| </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></div></div><p>2.上面的示例只描述了顺序文件，乱序文件的特点是: 文件中存储的数据与其他文件的数据存在相交， |
| 不仅仅和顺序文件相交，乱序和乱序文件之间也可能相交。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code> +---TsFile1---+ +---TsFile2---+ |
| | 1,2,3,4,5 | | 6,7,8,9,10 | |
| +-------------+ +-------------+ |
| +--------------unseq1-----------+ |
| | 2,11 | |
| +-------------------------------+ |
| +-unseq2-+ |
| | 3,4,5 | |
| +--------+ |
| |
| </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></div></div><p>3.对于<strong>相交</strong>的部分，需要使用<code>多路归并</code>查询出最终结果。具体处理细节可以参见<a href="/zh/SystemDesign/DataQuery/SeriesReader.html">SeriesReader</a>.</p> <p>4.对于文件层而言，我们抽象出了<code>TimeOrderUtils</code>，用来完成对升序、降序不同实现的方法提取。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code> <span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">TimeOrderUtils</span> <span class="token punctuation">{</span> |
| <span class="token comment">//排序使用的字段，升序使用开始时间，降序使用结束时间。</span> |
| <span class="token comment">//TsFileResource面对文件相关，Statistics面向Chunk和Page相关</span> |
| <span class="token keyword">long</span> <span class="token function">getOrderTime</span><span class="token punctuation">(</span><span class="token class-name">Statistics</span> statistics<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">long</span> <span class="token function">getOrderTime</span><span class="token punctuation">(</span><span class="token class-name">TsFileResource</span> fileResource<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//判断是否相交使用的时间依据，升序使用结束时间，降序使用开始时间</span> |
| <span class="token keyword">long</span> <span class="token function">getOverlapCheckTime</span><span class="token punctuation">(</span><span class="token class-name">Statistics</span> range<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//根据提供的时间判断是否相交，left为依据时间，right为要判断的文件</span> |
| <span class="token keyword">boolean</span> <span class="token function">isOverlapped</span><span class="token punctuation">(</span><span class="token class-name">Statistics</span> left<span class="token punctuation">,</span> <span class="token class-name">Statistics</span> right<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">boolean</span> <span class="token function">isOverlapped</span><span class="token punctuation">(</span><span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">Statistics</span> right<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">boolean</span> <span class="token function">isOverlapped</span><span class="token punctuation">(</span><span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">TsFileResource</span> right<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//对于有序文件的遍历规则，升序时正序遍历，降序时倒序遍历</span> |
| <span class="token class-name">TsFileResource</span> <span class="token function">getNextSeqFileResource</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">TsFileResource</span><span class="token punctuation">></span></span> seqResources<span class="token punctuation">,</span> <span class="token keyword">boolean</span> isDelete<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//对于所有文件层的临时缓存排序规则的实现</span> |
| <span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token class-name">Comparator</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">T</span><span class="token punctuation">></span></span> <span class="token function">comparingLong</span><span class="token punctuation">(</span><span class="token class-name">ToLongFunction</span><span class="token generics"><span class="token punctuation"><</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">T</span><span class="token punctuation">></span></span> keyExtractor<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//循环读取数据时判断是否到达了当前设置的停止点</span> |
| <span class="token keyword">boolean</span> <span class="token function">isExcessEndpoint</span><span class="token punctuation">(</span><span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token keyword">long</span> endpointTime<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">//或许当前使用的排序方式</span> |
| <span class="token keyword">boolean</span> <span class="token function">getAscending</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| </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></div></div><p>5.完成了上述步骤，倒序取出来的数据如下：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>6,7,8,9,10,1,2,3,4,5 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这是因为数据在Chunk、Page、缓存中都是升序存储，所以转移到 <code>BatchData</code> 中查看就是示例中的样子。</p> <h2 id="batchdata"><a href="#batchdata" class="header-anchor">#</a> BatchData</h2> <p>1.为了兼容原有的文件读取数据方式，所以在数据放到 <code>BatchData</code> 之后倒序读取集合里的数据就可以得到最终结果。</p> <p>BatchData类似一个二维数组的格式，封装了写入和读取的方法，对于倒序，抽象了下面的子类：</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code> |
| <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">DescBatchData</span> <span class="token keyword">extends</span> <span class="token class-name">BatchData</span> <span class="token punctuation">{</span> |
| <span class="token comment">//判断是否还有值，正序时候判断是否读到写入的size位置，倒序就是判断是否读到了0的位置</span> |
| <span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">hasCurrent</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">//指针移动到下一个数据，正序为 index+1 操作， 倒序为 index-1 操作</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">//重制指针位置，正序为重制到0，倒序重制到数据写入位置</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">resetBatchData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">//就像是Nio中的Buffer类的flip操作，在数据写入完成时做的操作，为读取做好准备</span> |
| <span class="token keyword">public</span> <span class="token class-name">BatchData</span> <span class="token function">flip</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token comment">//使用具体时间获取值，正序时index从0到size遍历，倒序时从size到0遍历</span> |
| <span class="token keyword">public</span> <span class="token class-name">Object</span> <span class="token function">getValueInTimestamp</span><span class="token punctuation">(</span><span class="token keyword">long</span> time<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| </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>2.在需要倒序处理数据的位置构建<code>DescBatchData</code>类，为此，特意设计了一个<code>BatchDataFactory</code>类， |
| 根据ascending参数判断生产哪个类型的BatchData。</p> <p>3.因为<code>MergeReader</code>使用了<code>PageReader</code>，所以在降序模式的时候数据会被倒序读出来(如下):</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>5 4 3 2 1 |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这种情况会使得<code>BatchData</code>使用<code>getValueInTimestamp</code>方法变得困难(因为在正序模式的时候默认为越往后的数据时间越大， |
| 倒序模式的时候越后时间越小)，但是按照如上数据示例无论在哪种模式下，都是违反了期望的数据时间比较，所以，新增了一个 |
| <code>getValueInTimestamp(long time, BiFunction<Long, Long, Boolean> compare)</code>方法， |
| 让不同的使用场景抉择基于时间的数据查找方式。</p> <p>4.至此数据从磁盘和缓存中取出的数据都是严格按照时间排序的了。</p> <h2 id="数据集"><a href="#数据集" class="header-anchor">#</a> 数据集</h2> <p>1.原始数据查询</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> root <span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token keyword">time</span> <span class="token keyword">desc</span> |
| <span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> root <span class="token keyword">where</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>d1<span class="token punctuation">.</span>s1<span class="token operator">></span><span class="token number">100</span> <span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token keyword">time</span> <span class="token keyword">desc</span> |
| <span class="token keyword">select</span> <span class="token operator">*</span> <span class="token keyword">from</span> root <span class="token keyword">where</span> <span class="token keyword">time</span> <span class="token operator">></span><span class="token number">100</span> <span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token keyword">time</span> <span class="token keyword">desc</span> |
| </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></div></div><p>原始数据查询中，只要向<code>SeriesReader</code>传递了正确的ascending参数就能得到正确的结果。</p> <p>2.GroupBy</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> max_time<span class="token punctuation">(</span><span class="token operator">*</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root <span class="token keyword">group</span> <span class="token keyword">by</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">10</span><span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token number">2</span>ms<span class="token punctuation">)</span> <span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token keyword">time</span> <span class="token keyword">desc</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>如上所示的Sql中,groupBy查询的区间分别为:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>[0-2),[2-4),[4-6),[6-8),[8-10) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>倒序查询只需要将时间计算的过程修改为:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>[8-10),[6-8),[4-6),[2-4),[0-2) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><blockquote><p>计算方法为:</p> <p>((结束时间-开始时间)/步长值） 结果向上取整，得到的值为GroupBy中会发生的遍历次数(记为i)。</p> <p>(步长 * (i-1) + 开始时间) 结果为第i次遍历的开始时间值。</p></blockquote> <p>对于BatchData中的数据大于每次遍历的结束时间时，进行skip，然后对 <code>AggregateResult</code> 新增 |
| minBound计算限制,限制为第i次遍历的开始时间值， |
| <strong>数据无论是正序还是倒序遍历对于<code>AggregateResult</code>的结果是等价的</strong>.</p> <p>3.GroupByFill</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> last_value<span class="token punctuation">(</span>s0<span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>ln<span class="token punctuation">.</span>d1 <span class="token keyword">group</span> <span class="token keyword">by</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">5</span><span class="token punctuation">]</span><span class="token punctuation">,</span><span class="token number">1</span>ms<span class="token punctuation">)</span> fill <span class="token punctuation">(</span>int32<span class="token punctuation">[</span>Previous<span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token keyword">order</span> <span class="token keyword">by</span> <span class="token keyword">time</span> <span class="token keyword">desc</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>对于升序的插值计算, 在 <code>GroupByFillDataSet</code> 中做了前值缓存，当本次查询的值不为空时，更新缓存; |
| 为空时使用缓存中的数据。</p> <p>对于降序查询，因为数据在倒序遍历，并不知道它的前值是多少，所以为 <code>GroupByEngineDataSet</code> |
| 抽象了 <code>peekNextNotNullValue</code> 方法，继续往前执行，一直查找到一个不为空的值返回。并将该值缓存到 |
| <code>GroupByFillDataSet</code> 中并遵从升序的补值方法，到当前的循环开始时间小于缓存的时间时缓存失效。</p> <p>4.Last |
| 在<code>LastQueryExecutor</code>中，一次性将所有的结果集封装在了一个List中， |
| 当倒序时将List中的数据根据时间进行一次排序,就得到了结果,详情见<code>ListDataSet</code>.</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
| ← |
| <a href="/zh/SystemDesign/DataQuery/GroupByFillQuery.html" class="prev"> |
| 降采样补空值查询 |
| </a></span> <span class="next"><a href="/zh/SystemDesign/Tools/Sync.html"> |
| 同步工具 |
| </a> |
| → |
| </span></p></div> <p style="text-align: center;">Copyright © 2020 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.2ee94be6.js" defer></script><script src="/assets/js/3.49f0f20a.js" defer></script><script src="/assets/js/293.33a99011.js" defer></script> |
| </body> |
| </html> |
