oracle stores data logically in tablespaces and physically in datafiles associated with
the corresponding tablespace.
datafiles objects(physical structures associated with only one tablespace)
objects (stored in tablespaces-may span several datafiles)
databases, tablespaces, and datafiles are closely related, but they have important differences:
1 an oracle database consists of one or more logical storage units called tablespaces,
which collectively store all of the database??s data.
2 each tablespace in an oracle database consists of one or more files called datafiles,
which are physical structures that conform to the operating system in which
oracle is running.
3 a database??s data is collectively stored in the datafiles that constitute each
tablespace of the database.
2. 对象存储在表空间 ，可能跨越多个数据文件
conform to 符合, 遵照
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