The Create Logical File (CRTLF) command creates a logical file from the information specified on this command and from the data description specifications (DDS) contained in a source file.
A logical file is a database file that describes how data records contained in one or more physical files are presented to a program. The logical file does not contain data records. The data records are contained in the physical files associated with the logical file.
The data records contained in the physical files are grouped into physical file members. The logical file accesses the data records through one or more logical file members. Each logical file member describes the data contained in one or more physical file members, and each logical file member has its own access path to the data.
Normally, database files have only one member which, by default, is added to the file when the file is created.
This notebook allows you to specify the logical file's name, library, and description, including access to notebook pages which contain settings for generation severity levels, input/output, and member specific compiler options.
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