SAP HANA SQL Update on large table

Hi all,

I'm struggeling with a simple move of one field to another within a single table, consisting of 2 Billion recs.

To following approaches lead into the error message "transaction rolled back by an internal error: TableUpdate failed" due to Memory Overflow.

1. Simple update failed:

Update t1.QTY_2 = t1.QTY_1;

2. Cursor Approach failed eiter:

declare cursor c_cur for select * from t1 for update;    

for r1 as c_cur do
             v_count := :v_count + 1;
             Update t1.QTY_2 = t1.QTY_1

             where t1.ID = r1.ID ;
            
             if MOD(:v_count,100) = 0 then        --commit each 100 recs.
                   commit;
             end if;
    end for;
commit;

Does anybody out there has an idea, how to split the update into digestible slices?

I'm running out of ideas.

Thanks in advance

Cheers

Sven