当我们在本文后面讨论中遇到连接管理、数据检索和数据合并等问题时，您就会开始明白这是为什么。
You'll begin to see why when we discuss the connection management, data retrieval, and data consolidation issues we confronted later in this article.
为了维护这种持久性，应用程序组件必须能够处理并发性、连接管理、数据完整性和同步。
To maintain this type of persistence, application components must be capable of handling concurrency, connection management, data integrity, and synchronization.
一个是构建两个能够彼此接管的数据库；另一个是减少潜在停机时间让一切更为合理。
One is to build two database servers that can take over for each other; the other approach is to reduce the potential downtime to something reasonable.
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