Parallel Access with ORACLE_LOADER【每日一译】--20121226

The ORACLE_LOADER access driver attempts to divide large datafiles into chunks that
can be processed separately.
The following file, record, and data characteristics make it impossible for a file to be

processed in parallel:

ORACLE_LOADER访问驱动器试图将大的数据文件分成可以单独处理的多个块。

以下文件，记录和数据规格参数是不可能用于并行处理的对于一个文件来讲。

■ Sequential data sources (such as a tape drive or pipe)
■ Data in any multibyte character set whose character boundaries cannot be
determined starting at an arbitrary byte in the middle of a string
This restriction does not apply to any datafile with a fixed number of bytes per
record.

■ Records with the VAR format

Specifying a PARALLEL clause is of value only when large amounts of data are
involved

#顺序数据源（比如磁盘设备或者管道）

#数据在多字节的字符集中，它的字符分界不能确定从一个字符串的随意字节开始

这个限制不能应用于任何数据文件它有一个确定的字节数对于每个记录。

#使用VAR格式的记录

指定一个PARALLEL语句有价值的仅当大量的数据文件被使用时候。