RDL Defaults

Record Definition Language › RDL Defaults

RDL Defaults

If the RECDEF DD statement is not present in the execution JCL for the File Prepass Utility or by the IUI, or if it specifies a null data set (that is, one with no records), default RDL specifications are generated based upon characteristics of the data set defined by the INFILE DD statement. The defaults are also generated if the only RDL specification supplied by the user is a single type L field.

Note: If L. is specified, all dfaults begin with L,....

In the default RDL specification formulas shown below, the following variables are substituted with appropriate values, obtained from the data set label or JCL specifications:

Variable	Description
x	The number of bytes before the key, excluding the RDW (if present)
x'	x-1
y	The number of bytes following the key; if there is no key, then y is the record length (LRECL)
k	The number of bytes in the key (KEYLEN)
k'	k+1
j	k + the relative key position (RKP)

The generated defaults are printed on the PRINT data set by the File Prepass Utility or the IUI.

	Files	Formulas for Default RDL Specifications
Sequential	Fixed-length	C1Fy
	Variable-length	V2-4,GAF2,C1FVS
	Undefined	C1VER
ISAM	Fixed-length, key at beginning of record	Nk,,C1Fy
	Fixed-length, RKP=1a	Nk',,C2Fy
	Fixed-length, RKP>1a	N1,,C1Fx',,Nk,,C2Fy
	Fixed-length, key at end of record	N1,,C1Fx',,Nk
	Variable-length, relative key position = 4	V2-j,,GAF2,,Nk,,C2FVS
	Variable-length, RKP=5a	V2-j,,GAF2,,Nk',,C2FVS
	Variable-length, RKP>5a	V2-j,,GAF2,,N1,,C1Fx', Nk,,C2FVS
VSAM	Fixed-length, key at beginning of record	Nk,,C1Fy
	Fixed-length, key somewhere within the record	N1,,C1Fx',,Nk,,C2Fy
	Fixed-length, key at end of record	N1,,C1Fx',,Nk
	Variable-length, key at beginning of record	Nk,,C2VER
	Variable-length, RKP=1a	Nk',,C2VER
	Variable-length, RKP>1a	N1,,C1Fx',,Nk,,C2VER

a. Default definition permits record deletion when the DCB parameter OPTCD=L is specified.