Figure 1. L7 Format
L7 indicates the segment length that MFX should use for maximum sorting efficiency. The decimal value n of the optional L7 parameter is provided by the HISTOGRM utility program. (A segment is a fixed-length area used to contain all or part of a variable-length record.) The L7 value overrides (if present) the l7 parameter of the RECORD control statement. If neither L7 nor l7 is provided, MFX will estimate this value.
L7 is only used for sorting variable-length records. It is ignored by merge, and copy applications.