When using many data document, advocate data file is used at storage system object and watch, secondary data file is used at memory user data and index.

采用多个数据文件时，主数据文件用于存储系统对象和表，次要数据文件用于存储用户数据和索引。

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Control the database of dimensions to 1gb, file of a data is enough, if have secondary data file, advocate the index that there is file of administrative secondary data in data file.

对于1gb左右规模的数据库，一个数据文件就够了，如果有次要数据文件，主数据文件中有管理次要数据文件的指针。

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In this mode, the secondary reads data from the staging file and receives new data from the primary directly.

在这种模式中，次要服务器从暂存文件中读取数据，并从主要服务器直接接收新数据。

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