返回到我们的用例，SOA环境中的迁移、故障转移和扩展不再是差别非常大的流程，而是成为了现在的相同流程的次要变化形式。
Going back to our use case, migration failover and scaling in an SOA environment are no longer very different processes, but are now minor variations of the same process.
它还有一个很棒的功能，称为自动模式迁移，该功能根据JBoss用新部署的应用程序所发现的差别自动修改数据库表。
It also has a nice feature called automatic schema migration, which automatically modifies a database table based on differences JBoss finds with a newly deployed application.
Rails 迁移使我们能够用代码表示模式的两个版本之间的差别，和它们所包含的数据之间的差别（请参阅文章 “ Rails 迁移”）。
Rails migrations let us express the differences between two versions of our schema, and the data they contain, in code (see the article " Rails migrations").
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