blocks|key|862535|text|在一般的上下文中，它可以指任何较旧的数据库技术。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|862536|在更具体的上下文中，它可以指团队从以前的项目所有者那里继承的数据库系统。|862537|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

In the general context, it can refer to any of the older database technologies.

In a more specific context, it can refer to a database system that was inherited by a team from previous project owners.

blocks|key|862719|text|遗留数据库通常是您必须继承的东西，并且是您的一些设计决策的基础。大多数公司可能已经有了其他(通常很糟糕)的解决方案，你需要给他们一个更大更好的产品……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|862720|而不是|offset|length|style|BOLD|862721|它必须与所有旧的遗留数据一起工作。该公司不会仅仅为了保留所有旧记录而管理两个不同的应用程序。您需要开发您的解决方案，以便能够将数据从遗留系统迁移到您的系统。这可能会对新数据库的整体设计产生巨大影响，因为它不能与以前的数据库偏离太远，而不会在数据完整性方面引入许多问题。|862722|entityMap^0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

A legacy database is generally something that you will have to inherit and base some of your design decisions around. Most companies that put out work may already have some other (usually horrible) solution and you need to give them a bigger and better product...

BUT

It has to work with all of their old legacy data. The company is not going to want to manage two different applications just so they can keep all their old records. You will need to develop your solution to be able to migrate the data from the legacy system over into your system. This can have a massive impact on the overall design of the new database, because it cannot stray too far from the previous without introducing a lot of problems in terms of data integrity.

blocks|key|4925181|text|在我的经验中，这通常是贬义的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4925182|一些谁也不想碰的东西，以防它无法维护(比方说，SQL6.5的盒子里躺着around)|4925183|Someone别人设计和实现得很糟糕的database|unordered-list-item|4925184|
|4925185|Something，有人正试图通过93岁的wierdo|4925186|
来replace|4925187|Supported+|4925188|4925189|4925190|4925191|如果它正在使用中，但仍然有维护或开发活动，那么它就不能是遗留的……|4925192|编辑:考虑到SQL语言和RDBMS的时代，与列出的软件相比，一切都是遗留的(包括我的新系统，明年到期)。从数据库的角度来看，Ruby在什么时候转向了遗留？|4925193|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|13|8|@]|9|@]|A|$]]|$1|O|3|-4|5|F|7|14|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|17|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|18|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|W|$]]

It's usually derogatory in my experience:

<ul>
<li>Something no-one wants to touch in case it breaks</li>
<li>Databases that can't be maintained (say that SQL 6.5 box lying around)</li>
<li>Someone else's badly designed and implemented database</li>
<li>Something that someone is trying to replace</li>
<li>Supported by the 93 year old wierdo</li>
</ul>

If it's in-use but still has maintenance or development activities, it can't be legacy...

Edit:
Given the age of the SQL language and the RDBMS, everything is legacy (including my new system due next year) compared to the software listed. At what point does Ruby turn legacy from the database perspective..?

blocks|key|4925225|text|我们主要使用术语‘遗留数据库’作为我们不能‘容易’修改的db模式，而不破坏使用该模式的其他软件/系统。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4925226|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

We mostly use the term 'legacy database' as a db schema we can not 'easily' modify without breaking other software/systems using this schema.

blocks|key|4080314|text|this总结得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4080315|编辑断开的链接。以下是FOLDOC的引述：|4080316|遗留系统--由于更换或重新设计成本而继续使用的计算机系统或应用程序，尽管其竞争力和与现代同等产品的兼容性很差。这意味着这个系统很大、很单一，而且很难修改。|4080317|如果遗留软件仅在过时的硬件上运行，则维护成本最终可能超过更换软件和硬件的成本，除非某种形式的仿真或向后兼容性允许软件在新硬件上运行。|4080318|entityMap|0|LINK|mutability|MUTABLE|url|http://www.nightflight.com/foldoc-bin/foldoc.cgi?legacy%2Bsystem^0|0|4|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]]]

<a href="http://www.nightflight.com/foldoc-bin/foldoc.cgi?legacy+system" rel="nofollow noreferrer">this</a> sums it up pretty well.

[edit] Broken link. Here's the quote from FOLDOC: 
Legacy System -- A computer system or application program which continues to be used because of the cost of replacing or redesigning it and often despite its poor competitiveness and compatibility with modern equivalents. The implication is that the system is large, monolithic and difficult to modify.

If legacy software only runs on antiquated hardware the cost of maintaining this may eventually outweigh the cost of replacing both the software and hardware unless some form of emulation or backward compatibility allows the software to run on new hardware.

blocks|key|4080084|text|我打赌他们指的是数据库的模式，而不是数据库系统本身。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4080085|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I bet they are referring to the schema of the database, rather than the database system itself.

blocks|key|4080343|text|平面文件、层次结构和网络数据库通常称为传统数据库。它们代表了大约30年前史前时代人们用来组织信息的方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4080344|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Flat file, hierarchy, and network databases are usually referred as legacy databases. They represent the ways people used to organize information in prehistoric times — about 30 years ago.

blocks|key|1296643|text|遗产是用来表示旧事物的。遗留数据库是由于替换和重新设计它的成本而继续使用的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1296644|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Legacy is used to denote the old thing. legacy database is something which continues to be used because of it cost of replacing and redesigning it.

blocks|key|862590|text|一般来说，上下文是指继承的旧代码。Tipycally+cobol代码。它用于由于历史原因仍在使用的代码。它也适用于DB模式|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|862591|entityMap^0|E|1B|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

In general context refers to old code inherited. Tipycally cobol code.
It is used for code which it is still used for historcal reasons.
It applies also for DB schemas

blocks|key|4925491|text|由于信息技术发展的长期历史(包括不同硬件和操作系统的应用)，许多企业都获得了遗留数据库。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4925492|4925493|+遗留数据库是一组异构数据库，它们组合了不同种类的数据系统，例如关系或面向对象的数据库、分层数据库、网络数据库、电子表格、多媒体数据库或文件系统。|blockquote|offset|length|style|BOLD|4925494|4925495|4925496|遗留数据库中的异构数据库可以通过计算机内或计算机间网络连接。|4925497|这种数据库之间的信息交换很困难，因为考虑到不同的语义，它需要从一种表示到另一种表示的精确转换规则|4925498|entityMap^0|0|0|1|5|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|T|8|@$F|U|G|V|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|Y|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|Z|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|Q|$]]

Many enterprises acquire legacy databases as a result of the long history of information technology development (including the application of different hardware and operating systems).
<blockquote>
A legacy database is a group of heterogeneous databases that combines different kinds of data systems, such as relational or object-oriented databases, hierarchical databases, network databases, spreadsheets, multimedia databases, or filesystems.
</blockquote>
The heterogeneous databases in a legacy database may be connected by intra- or inter- computer networks. 
Information exchange across such databases is difficult because it would require
precise transformation rules from one representation to another, considering diverse
semantics

I read this term a lot. What exactly is a legacy database? I ask because I had thought it meant an old database like dbase or rdb, but I don't think I'm right.

When looking at RoR or Django and "legacy database" integration, what does legacy database really mean? Is it different than a generic term "legacy database"?

What does the term legacy database mean?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这个学期我读了很多。什么是遗留数据库？我问这个问题是因为我以为它指的是像dbase或rdb这样的旧数据库，但我不认为我是对的。当考虑RoR或Django与“遗留数据库”的集成时，遗留数据库的真正含义是什么？它是否与通用术语“遗留数据库”不同？

问术语遗留数据库是什么意思？
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