RMAN将备份已经在数据库中使用的所有数据块。
RMAN will backup all data blocks that have ever been in use in database.
一块拼图是数据建模，另一块是数据库更改。
One puzzle piece is data modeling and another is database change.
数据块是构成数据库的最小数据单位。
A data block is the smallest unit of data used by a database.
数据块是构成数据库的最小数据单位。
A data block is the smallest unit of data used by a database.
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