(也叫做NDB)是一种提供了高可用性和数据持久性特征的内存式存储引擎。
NDBCLUSTER (also known as NDB) is an in-memory storage engine offering high-availability and data-persistence features.
由于数据网格的主要特征是可伸缩性和高可用性，专门用于持久性的高速磁盘和数据库在大多数情况下不再需要。
Since the primary characteristics of a data grid are scalability and high availability, high-speed disks and databases used exclusively for persistence are no longer needed in most cases.
类之间的关系，以及程序逻辑都不会去考虑持久性存储的特征或者结构。
Neither the relationships between our classes, nor the application logic took into consideration the characteristics or structure of an underlying persistence storage.
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