However they are extremely useful if there is an unexpected peak in activity which results in all of the primary extents being filled (due to a long running unit of work for example).
不过，如果活动中出现了非预期的峰值而导致主扩展被用完(例如，由于出现了长时间运行的工作单元)，这就极为有用了。
A segment is a set of extents that contains all the data for a specific logical storage structure within a tablespace.
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, each of which has been allocated for a specific data structure and all of which are stored in the same tablespace.
段是由一组区组成的，这些区每个都被分配了一个特定的数据结构并且都被存储在同一个表空间中。
A segment is a set of extents that contains all the data for a specific logical storage structure within a tablespace.
表或者簇中的存储参数决定了数据段中区的分配原则。
A segment is a set of extents that contains all the data for a specific logical storage structure within a tablespace.
表或者簇中的存储参数决定了数据段中区的分配原则。
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