Create another data set with the same structure, but with many observations. Sort the data set.

data phull;
    length var1 8.;
    do var1=1 to 100000;
    output;
end;
run;

proc sort data=phull;
    by DESCENDING var1;
run;

proc append base=mtea data=phull getsort;
run;

ods select sortedby;

proc contents data=mtea;
run;