what factor affects the performance.
Here as said on both the cases of LRECL i haven't changed the input. It runs for the current day for the same time interval. If i'm not addressing this as a performance block, what could be the reason for the decrease in number of records written. just curious. Will compiling the rexx would help since i found some performance tips from here. http://publib.boulder.ibm.com/infocenter/zos/v1r12/index.jsp?topic=%2Fcom.ibm.zos.r12.ikja300%2Fikj4a39007.htm. Please advice.Without using the same input, the record length becomes irrelevant as a comparison.
what could be the reason for the decrease in number of records written
I do not think you are receiving the same input records. Show us the first timestamp of the first and last records in each case.