Defining a logical file using DDS

A logical file determines how data records are selected and defined when read by an application program. A logical file can be a simple, multiple format, or join logical file.

A simple logical file contains one record format and has one file specified on the PFILE keyword. A multiple format logical file either contains more than one record format or has more than one file specified on the PFILE keyword. A join logical file contains one record format and has up to 256 files specified on the JFILE keyword.