March 2022
Intermediate to advanced
293 pages
5h 31m
Chinese
Content preview from 精通区块链
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其他的区块链 ｜ 235
•
区块链是一种交易机制，交易方可以达成一致吗？
•
各方能否就使用区块链写入什么样的数据达成一致？
•
能否用这种技术解决问题？
所有问题的答案都是肯定的。
9.2
数据库和分布式账本
一个数据库就是一组存储在计算机系统内的结构化信息，数据库是数据存储
的关键，根据数据的使用可以以几种不同的方式进行访问，数据库管理系统
（
DBMS
）为终端用户提供了分类检索数据的接口。这些使用者通常都是机
构的重要组成部分，从事诸如通信、薪酬和人力等领域。目前最流行的数据
库是关系数据库，使用表来整理数据，数据以不重复的横列方式存储。
备份系统与数据库一起使用，以达到分布式的目的。备份需要将数据按照同
一种方式存储在多个地方，以便于更新和同步，这样做可以提高数据可用性。
数据库必须把握好高可用性和效率之间的平衡，复制还可以让用户并行处理
不同数据集，备份系统必须不断更新数据，以确保所有人使用数据是一致的，
备份系统提供多种不同的复制模式保持数据的一致性。
分布式账本是一个用来描述记录系统的术语，无准入分布式账本一词有时用
于描述加密货币区块链，包括比特币、以太坊、各个分叉链和其他山寨币。
这些网络被称为无准入，因为任何人都可以加入和参与，不需要中心机构进
行准入授权。
无准入的区块链就是一个集成了账户和支付体系的分布式计算机系统，然而，
一些组织并没有特别看到其中的优势。无准入系统需要账户、支付和加密货
币三者结合以给用户使用，但对于准入控制分布式账本来说，这并不是必要
元素，在准入控制的世界中，提供账户和支付就够了。 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.