(window.webpackJsonp=window.webpackJsonp||[]).push([[469],{867:function(t,e,s){"use strict";s.r(e);var a=s(29),r=Object(a.a)({},(function(){var t=this,e=t._self._c;return e("ContentSlotsDistributor",{attrs:{"slot-key":t.$parent.slotKey}},[e("h1",{attrs:{id:"权限管理"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#权限管理"}},[t._v("#")]),t._v(" 权限管理")]),t._v(" "),e("p",[t._v("IoTDB 为用户提供了权限管理操作，从而为用户提供对于数据的权限管理功能，保障数据的安全。")]),t._v(" "),e("p",[t._v("我们将通过以下几个具体的例子为您示范基本的用户权限操作，详细的 SQL 语句及使用方式详情请参见本文 "),e("RouterLink",{attrs:{to:"/zh/UserGuide/Master/Data-Concept/Data-Model-and-Terminology.html"}},[t._v("数据模式与概念章节")]),t._v("。同时，在 JAVA 编程环境中，您可以使用 "),e("RouterLink",{attrs:{to:"/zh/UserGuide/Master/API/Programming-JDBC.html"}},[t._v("JDBC API")]),t._v(" 单条或批量执行权限管理类语句。")],1),t._v(" "),e("h2",{attrs:{id:"基本概念"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#基本概念"}},[t._v("#")]),t._v(" 基本概念")]),t._v(" "),e("h3",{attrs:{id:"用户"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#用户"}},[t._v("#")]),t._v(" 用户")]),t._v(" "),e("p",[t._v("用户即数据库的合法使用者。一个用户与一个唯一的用户名相对应，并且拥有密码作为身份验证的手段。一个人在使用数据库之前，必须先提供合法的（即存于数据库中的）用户名与密码，使得自己成为用户。")]),t._v(" "),e("h3",{attrs:{id:"权限"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#权限"}},[t._v("#")]),t._v(" 权限")]),t._v(" "),e("p",[t._v("数据库提供多种操作，并不是所有的用户都能执行所有操作。如果一个用户可以执行某项操作，则称该用户有执行该操作的权限。权限可分为数据管理权限（如对数据进行增删改查）以及权限管理权限（用户、角色的创建与删除，权限的赋予与撤销等）。数据管理权限往往需要一个路径来限定其生效范围，可使用"),e("RouterLink",{attrs:{to:"/zh/UserGuide/Master/Data-Concept/Data-Model-and-Terminology.html"}},[t._v("路径模式")]),t._v("灵活管理权限。")],1),t._v(" "),e("h3",{attrs:{id:"角色"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#角色"}},[t._v("#")]),t._v(" 角色")]),t._v(" "),e("p",[t._v("角色是若干权限的集合，并且有一个唯一的角色名作为标识符。用户通常和一个现实身份相对应（例如交通调度员），而一个现实身份可能对应着多个用户。这些具有相同现实身份的用户往往具有相同的一些权限。角色就是为了能对这样的权限进行统一的管理的抽象。")]),t._v(" "),e("h3",{attrs:{id:"默认用户及其具有的角色"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#默认用户及其具有的角色"}},[t._v("#")]),t._v(" 默认用户及其具有的角色")]),t._v(" "),e("p",[t._v("初始安装后的 IoTDB 中有一个默认用户：root，默认密码为 root。该用户为管理员用户，固定拥有所有权限，无法被赋予、撤销权限，也无法被删除。")]),t._v(" "),e("h2",{attrs:{id:"权限操作示例"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#权限操作示例"}},[t._v("#")]),t._v(" 权限操作示例")]),t._v(" "),e("p",[t._v("根据本文中描述的 "),e("a",{attrs:{href:"https://github.com/thulab/iotdb/files/4438687/OtherMaterial-Sample.Data.txt",target:"_blank",rel:"noopener noreferrer"}},[t._v("样例数据"),e("OutboundLink")],1),t._v(" 内容，IoTDB 的样例数据可能同时属于 ln, sgcc 等不同发电集团，不同的发电集团不希望其他发电集团获取自己的数据库数据，因此我们需要将不同的数据在集团层进行权限隔离。")]),t._v(" "),e("h3",{attrs:{id:"创建用户"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#创建用户"}},[t._v("#")]),t._v(" 创建用户")]),t._v(" "),e("p",[t._v("使用 "),e("code",[t._v("CREATE USER <userName> <password>")]),t._v(" 创建用户。例如，我们可以使用具有所有权限的root用户为 ln 和 sgcc 集团创建两个用户角色，名为 ln_write_user, sgcc_write_user，密码均为 write_pwd。建议使用反引号(`)包裹用户名。SQL 语句为：")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("CREATE USER `ln_write_user` 'write_pwd'\nCREATE USER `sgcc_write_user` 'write_pwd'\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("p",[t._v("此时使用展示用户的 SQL 语句：")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("LIST USER\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br")])]),e("p",[t._v("我们可以看到这两个已经被创建的用户，结果如下：")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("IoTDB> CREATE USER `ln_write_user` 'write_pwd'\nMsg: The statement is executed successfully.\nIoTDB> CREATE USER `sgcc_write_user` 'write_pwd'\nMsg: The statement is executed successfully.\nIoTDB> LIST USER\n+---------------+\n|           user|\n+---------------+\n|  ln_write_user|\n|           root|\n|sgcc_write_user|\n+---------------+\nTotal line number = 3\nIt costs 0.157s\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br"),e("span",{staticClass:"line-number"},[t._v("3")]),e("br"),e("span",{staticClass:"line-number"},[t._v("4")]),e("br"),e("span",{staticClass:"line-number"},[t._v("5")]),e("br"),e("span",{staticClass:"line-number"},[t._v("6")]),e("br"),e("span",{staticClass:"line-number"},[t._v("7")]),e("br"),e("span",{staticClass:"line-number"},[t._v("8")]),e("br"),e("span",{staticClass:"line-number"},[t._v("9")]),e("br"),e("span",{staticClass:"line-number"},[t._v("10")]),e("br"),e("span",{staticClass:"line-number"},[t._v("11")]),e("br"),e("span",{staticClass:"line-number"},[t._v("12")]),e("br"),e("span",{staticClass:"line-number"},[t._v("13")]),e("br"),e("span",{staticClass:"line-number"},[t._v("14")]),e("br")])]),e("h3",{attrs:{id:"赋予用户权限"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#赋予用户权限"}},[t._v("#")]),t._v(" 赋予用户权限")]),t._v(" "),e("p",[t._v("此时，虽然两个用户已经创建，但是他们不具有任何权限，因此他们并不能对数据库进行操作，例如我们使用 ln_write_user 用户对数据库中的数据进行写入，SQL 语句为：")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("INSERT INTO root.ln.wf01.wt01(timestamp,status) values(1509465600000,true)\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br")])]),e("p",[t._v("此时，系统不允许用户进行此操作，会提示错误：")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("IoTDB> INSERT INTO root.ln.wf01.wt01(timestamp,status) values(1509465600000,true)\nMsg: 602: No permissions for this operation INSERT\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("p",[t._v("现在，我们用root用户分别赋予他们向对应存储组数据的写入权限.")]),t._v(" "),e("p",[t._v("我们使用 "),e("code",[t._v("GRANT USER <userName> PRIVILEGES <privileges> ON <nodeName>")]),t._v(" 语句赋予用户权限(注：其中，创建用户权限无需指定路径)，例如：")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("GRANT USER `ln_write_user` PRIVILEGES INSERT_TIMESERIES on root.ln.**\nGRANT USER `sgcc_write_user` PRIVILEGES INSERT_TIMESERIES on root.sgcc1.**, root.sgcc2.**\nGRANT USER `ln_write_user` PRIVILEGES CREATE_USER\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br"),e("span",{staticClass:"line-number"},[t._v("3")]),e("br")])]),e("p",[t._v("执行状态如下所示：")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("IoTDB> GRANT USER `ln_write_user` PRIVILEGES INSERT_TIMESERIES on root.ln.**\nMsg: The statement is executed successfully.\nIoTDB> GRANT USER `sgcc_write_user` PRIVILEGES INSERT_TIMESERIES on root.sgcc1.**, root.sgcc2.**\nMsg: The statement is executed successfully.\nIoTDB> GRANT USER `ln_write_user` PRIVILEGES CREATE_USER\nMsg: The statement is executed successfully.\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br"),e("span",{staticClass:"line-number"},[t._v("3")]),e("br"),e("span",{staticClass:"line-number"},[t._v("4")]),e("br"),e("span",{staticClass:"line-number"},[t._v("5")]),e("br"),e("span",{staticClass:"line-number"},[t._v("6")]),e("br")])]),e("p",[t._v("接着使用ln_write_user再尝试写入数据")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("IoTDB> INSERT INTO root.ln.wf01.wt01(timestamp, status) values(1509465600000, true)\nMsg: The statement is executed successfully.\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("h3",{attrs:{id:"撤销用户权限"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#撤销用户权限"}},[t._v("#")]),t._v(" 撤销用户权限")]),t._v(" "),e("p",[t._v("授予用户权限后，我们可以使用 "),e("code",[t._v("REVOKE USER <userName> PRIVILEGES <privileges> ON <nodeName>")]),t._v(" 来撤销已授予的用户权限(注：其中，撤销创建用户权限无需指定路径)。例如，用root用户撤销ln_write_user和sgcc_write_user的权限：")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("REVOKE USER `ln_write_user` PRIVILEGES INSERT_TIMESERIES on root.ln.**\nREVOKE USER `sgcc_write_user` PRIVILEGES INSERT_TIMESERIES on root.sgcc1.**, root.sgcc2.**\nREVOKE USER `ln_write_user` PRIVILEGES CREATE_USER\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br"),e("span",{staticClass:"line-number"},[t._v("3")]),e("br")])]),e("p",[t._v("执行状态如下所示：")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("REVOKE USER `ln_write_user` PRIVILEGES INSERT_TIMESERIES on root.ln.**\nMsg: The statement is executed successfully.\nREVOKE USER `sgcc_write_user` PRIVILEGES INSERT_TIMESERIES on root.sgcc1.**, root.sgcc2.**\nMsg: The statement is executed successfully.\nREVOKE USER `ln_write_user` PRIVILEGES CREATE_USER\nMsg: The statement is executed successfully.\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br"),e("span",{staticClass:"line-number"},[t._v("3")]),e("br"),e("span",{staticClass:"line-number"},[t._v("4")]),e("br"),e("span",{staticClass:"line-number"},[t._v("5")]),e("br"),e("span",{staticClass:"line-number"},[t._v("6")]),e("br")])]),e("p",[t._v("撤销权限后，ln_write_user就没有向root.ln.**写入数据的权限了。")]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("INSERT INTO root.ln.wf01.wt01(timestamp, status) values(1509465600000, true)\nMsg: 602: No permissions for this operation INSERT\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("h3",{attrs:{id:"sql-语句"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#sql-语句"}},[t._v("#")]),t._v(" SQL 语句")]),t._v(" "),e("p",[t._v("与权限相关的语句包括：")]),t._v(" "),e("ul",[e("li",[t._v("创建用户")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("CREATE USER <userName> <password>;  \nEg: IoTDB > CREATE USER `thulab` 'passwd';\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("删除用户")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("DROP USER <userName>;  \nEg: IoTDB > DROP USER `xiaoming`;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("创建角色")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("CREATE ROLE <roleName>;  \nEg: IoTDB > CREATE ROLE `admin`;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("删除角色")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("DROP ROLE <roleName>;  \nEg: IoTDB > DROP ROLE `admin`;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("赋予用户权限")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("GRANT USER <userName> PRIVILEGES <privileges> ON <nodeNames>;  \nEg: IoTDB > GRANT USER `tempuser` PRIVILEGES INSERT_TIMESERIES, DELETE_TIMESERIES on root.ln.**, root.sgcc.**;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("赋予用户全部的权限")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("GRANT USER <userName> PRIVILEGES ALL ON <nodeNames>; \nEg: IoTDB > grant user renyuhua privileges all on root.sgcc.**, root.**;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("赋予角色权限")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("GRANT ROLE <roleName> PRIVILEGES <privileges> ON <nodeNames>;  \nEg: IoTDB > GRANT ROLE `temprole` PRIVILEGES INSERT_TIMESERIES, DELETE_TIMESERIES ON root.sgcc.**, root.ln.**;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("赋予角色全部的权限")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("GRANT ROLE <roleName> PRIVILEGES ALL ON <nodeNames>;  \nEg: IoTDB > GRANT ROLE `temprole` PRIVILEGES ALL ON root.ln.**;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("赋予用户角色")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("GRANT <roleName> TO <userName>;  \nEg: IoTDB > GRANT `temprole` TO tempuser;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("撤销用户权限")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("REVOKE USER <userName> PRIVILEGES <privileges> ON <nodeNames>;   \nEg: IoTDB > REVOKE USER `tempuser` PRIVILEGES DELETE_TIMESERIES on root.ln.**;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("移除用户所有权限")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("REVOKE USER <userName> PRIVILEGES ALL ON <nodeNames>; \nEg: IoTDB > REVOKE USER `tempuser` PRIVILEGES ALL on root.ln.**;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("撤销角色权限")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("REVOKE ROLE <roleName> PRIVILEGES <privileges> ON <nodeNames>;  \nEg: IoTDB > REVOKE ROLE `temprole` PRIVILEGES DELETE_TIMESERIES ON root.ln.**;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("撤销角色全部的权限")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("REVOKE ROLE <roleName> PRIVILEGES ALL ON <nodeNames>;  \nEg: IoTDB > REVOKE ROLE `temprole` PRIVILEGES ALL ON root.ln.**;\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br"),e("span",{staticClass:"line-number"},[t._v("2")]),e("br")])]),e("ul",[e("li",[t._v("撤销用户角色")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("REVOKE <roleName> FROM <userName>;\nEg: IoTDB > REVOKE `temprole` FROM tempuser;\n")])]),t._v(" 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root.ln.wf01.wt01.**;\n+-----------------------------------+\n|                          privilege|\n+-----------------------------------+\n|root.ln.wf01.** : CREATE_TIMESERIES|\n+-----------------------------------+\nTotal line number = 1\nIt costs 0.005s\n")])]),t._v(" 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"),e("h3",{attrs:{id:"密码限制"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#密码限制"}},[t._v("#")]),t._v(" 密码限制")]),t._v(" "),e("p",[t._v("IoTDB 规定密码的字符长度不小于 4，其中密码不能包含空格，密码默认采用 MD5 进行加密。")]),t._v(" "),e("h3",{attrs:{id:"角色名限制"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#角色名限制"}},[t._v("#")]),t._v(" 角色名限制")]),t._v(" "),e("p",[t._v("IoTDB 规定角色名的字符长度不小于 4，其中角色名不能包含空格。")]),t._v(" "),e("h3",{attrs:{id:"权限管理中的路径模式"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#权限管理中的路径模式"}},[t._v("#")]),t._v(" 权限管理中的路径模式")]),t._v(" "),e("p",[t._v("一个路径模式的结果集包含了它的子模式的结果集的所有元素。例如，"),e("code",[t._v("root.sg.d.*")]),t._v("是"),e("code",[t._v("root.sg.*.*")]),t._v("的子模式，而"),e("code",[t._v("root.sg.**")]),t._v("不是"),e("code",[t._v("root.sg.*.*")]),t._v("的子模式。当用户被授予对某个路径模式的权限时，在他的DDL或DML中使用的模式必须是该路径模式的子模式，这保证了用户访问时间序列时不会超出他的权限范围。")]),t._v(" "),e("h3",{attrs:{id:"权限缓存"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#权限缓存"}},[t._v("#")]),t._v(" 权限缓存")]),t._v(" "),e("p",[t._v("在分布式相关的权限操作中，在进行除了创建用户和角色之外的其他权限更改操作时，都会先清除与该用户（角色）相关的所有的"),e("code",[t._v("dataNode")]),t._v("的缓存信息，如果任何一台"),e("code",[t._v("dataNode")]),t._v("缓存信息清楚失败，这个权限更改的任务就会失败。")]),t._v(" "),e("h3",{attrs:{id:"非root用户限制进行的操作"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#非root用户限制进行的操作"}},[t._v("#")]),t._v(" 非root用户限制进行的操作")]),t._v(" "),e("p",[t._v("目前以下IoTDB支持的sql语句只有"),e("code",[t._v("root")]),t._v("用户可以进行操作，且没有对应的权限可以赋予新用户。")]),t._v(" "),e("h6",{attrs:{id:"ttl"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#ttl"}},[t._v("#")]),t._v(" TTL")]),t._v(" "),e("ul",[e("li",[t._v("设置ttl")])]),t._v(" "),e("div",{staticClass:"language- line-numbers-mode"},[e("pre",{pre:!0,attrs:{class:"language-text"}},[e("code",[t._v("Eg: IoTDB > set ttl to root.ln 3600\n")])]),t._v(" "),e("div",{staticClass:"line-numbers-wrapper"},[e("span",{staticClass:"line-number"},[t._v("1")]),e("br")])]),e("ul",[e("li",[t._v("取消ttl")])]),t._v(" "),e("div",{staticClass:"language- 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