本文介绍了Oracle数据库中的存储管理概念，从最高级别的表空间开始，向下分解到段、扩展区及数据块。每个部分都详细解释了其在数据库空间管理中的作用。
Starting with the highest level of Oracle disk-space management are tablespaces. Drilling down,you find segments that can reside in only one tablespace. Each segment is constructed from one or more
extents. Each of these extents can reside in only one datafile. Thus, for a segment to straddle multiple datafiles, it must be constructed from multiple extents, which are located in separate datafiles. An extent is composed of a contiguous set of data blocks
, which is at the lowest level of space management. A data block is a fixed number of bytes of disk space.
extents. Each of these extents can reside in only one datafile. Thus, for a segment to straddle multiple datafiles, it must be constructed from multiple extents, which are located in separate datafiles. An extent is composed of a contiguous set of data blocks
, which is at the lowest level of space management. A data block is a fixed number of bytes of disk space.
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