General Restrictions on RDL Use

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General Restrictions on RDL Use

The RDL is employed to construct the File Descriptor Table (FDT). The FDT has a maximum size, and there is a corresponding upper limit on the number of RDL specifications allowed for any one file. In the unlikely event that this maximum is reached, a user abend 4 occurs and the RDL specifications must be reduced by combining adjacent field definitions to form group fields. The space in the FDT required to contain the RDL specifications can be calculated using the following table.

RDL Specification	Space Required (In Bytes)
GA, PD, ZL, ZR	6
C1, C2, C3, CS	18
MA, MB	92 for first occurrence. 54 for each subsequent occurrence
UN	14
N	20
v	48
VP, VZ	40
S, X	26
First ( in a condition group series	72
Each remaining ( in a condition group series	54
Fn, where n < 128	4
Fn, where n > 128	38
FVS	46
VER, Dc	88
P	12
P + n	18
P + VS	8
Fixed repetition group	16
Variable repetition group	30

The space required must be summed according to RDL specifications as coded, and the total cannot exceed 2800. Consider the following example:

V2-4,GAF2,C1FVS.

Using the following table, the space required for these RDL specifications is as follows and well within the 2800 limit:

V2-4		GA		F2		C1		FVS		total
48	+	6	+	4	+	18	+	46	=	122