段是表空间内由包涵所有数据的区的集合，是一种指定的逻辑存储结构。
A segment is a set of extents that contains all the data for a specific logical storage structure within a tablespace.
这个计划十分重要，数据库的逻辑存储结构将影响数据库的性能和数据库的管理操作。
It is important to plan how the logical storage structure of the database will affect system performance and various database management operations.
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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