zoukankan      html  css  js  c++  java
  • uuid 去中心化的唯一性

    A Universally Unique IDentifier (UUID) URN Namespace

    https://tools.ietf.org/html/rfc4122.html

    A UUID is 128 bits long, and requires no central

    registration process.


    One of the main reasons for using UUIDs is that no centralized
    authority is required to administer them (although one format uses
    IEEE 802 node identifiers, others do not). 

    10 million per second per machine 

    A UUID is an identifier that is unique across both space and time,
    with respect to the space of all UUIDs. 


    Generating a UUID does not require that a registration authority
    be contacted. One algorithm requires a unique value over space
    for each generator. This value is typically an IEEE 802 MAC
    address, usually already available on network-connected hosts.
    The address can be assigned from an address block obtained from
    the IEEE registration authority. 

    去中心化检验的的借助mac地址和时间戳实现的唯一性

    mac地址有中心化管理的机制

    唯一性的保证的前提是有协议的限制,依赖于中心化的机制。

  • 相关阅读:
    租房子查询练习
    投票练习题
    多条件查询
    查询
    练习---新闻界面
    mysql增删改处理
    挖宝游戏
    mysql数据访问
    练习···表格
    类的使用
  • 原文地址:https://www.cnblogs.com/rsapaper/p/7791494.html
Copyright © 2011-2022 走看看