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Dictionary Managed Tablespaces (52)

原创 IT综合 作者:tsinglee 时间:2007-09-30 14:44:37 0 删除 编辑

If you created your database with an earlier version of Oracle, then you could be using
dictionary managed tablespaces. For a tablespace that uses the data dictionary to
manage its extents, Oracle updates the appropriate tables in the data dictionary
whenever an extent is allocated or freed for reuse. Oracle also stores rollback
information about each update of the dictionary tables. Because dictionary tables and
rollback segments are part of the database, the space that they occupy is subject to the
same space management operations as all other data.

dmt :使用字典数据管理区间 , 只要有区间被分配或者释放 , Oracle修改字典数据中相关的表 , 并且
产生回滚信息 。
最后一句话是什么意思 ?


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