Hi Naresh,
Rather than taking date period for 10 years, I suggest you to check for less period.
Try below query
SELECT T0.DocEntry,T0.DocNum,T0.DocTotal,T0.DocDate from OPCH T0 WHERE T0.DocDate >= '20160101' and T0.DocDate <= '20160429'
Run above query and let me know are you getting result or not.
Thanks,
Harshal