Partial Key in IMS

ap_mainframes · Posted: Fri Dec 19, 2008 3:54 am

Hi,

The key to a segment which partially populated. Like, Suppose, A,B,C & D form the key of the segment. Suppose the value of A,B & D are X,Y and Z respectively ( C is not populated ).

Is there any way with which I can diretly read the data where A=X, B=Y & D=Z ?
I know that I can read the data sequentially ( using GN call ) and keep on checking for these values, but the question's is there a way that I can directly go to the point where the three feilds are equal the data which I need ?
Please advise.

Sandy Zimmer · Posted: Fri Dec 19, 2008 7:01 pm

Remember that IMS reads left to right. You can load keys A and B with your known values and C and D with low values. You can then issue your GN with a >. You can also do a boolean SSA with a > in the first set - load keys C and D with high values and do a <.