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Introduction to Schema Objects (153)

原创 IT综合 作者:tsinglee 时间:2007-11-07 11:23:06 0 删除 编辑

A schema is a collection of logical structures of data, or schema objects. A schema is
owned by a database user and has the same name as that user. Each user owns a single
Schema objects are logical data storage structures. Schema objects do not have a
one-to-one correspondence to physical files on disk that store their information.
However, Oracle stores a schema object logically within a tablespace of the database.
The data of each object is physically contained in one or more of the tablespace’s
datafiles. For some objects, such as tables, indexes, and clusters, you can specify how
much disk space Oracle allocates for the object within the tablespace’s datafiles.
There is no relationship between schemas and tablespaces: a tablespace can contain
objects from different schemas, and the objects for a schema can be contained in
different tablespaces.

1. 方案是一个逻辑数据结构或称为方案对象 , 每个方案都术语一个数据库用户并与之同名 ,
一个用户拥有一个方案 .
2. 方案对象是一种逻辑数据存储结构 .


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