This file stores user data, such as tables and indexes, as well as the SQL catalogue (schema info). The data contained in one user table is evenly distributed across all DATADEVSPACEs. The combined size of all DATADEVSPACEs corresponds to the size of the database.
此文件用于存储用户数据（例如表格和索引）和 SQL 目录（类型信息）。一个用户表格中含有的数据将均匀地分布到所有的 DATADEVSPACE 中。所有 DATADEVSPACE 的总大小与数据库的大小相对应。