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SET TIMING ON

declare
  num   integer := 0;
  incr  integer := 1;
  limit integer := 100000000;
begin
  while num < limit loop
    num := num + incr;
  end loop;
end;
PL/SQL procedure successfully completed.

Elapsed: 00:00:20.23
ex:2
declare
  num   binary_integer := 0;
  incr  binary_integer := 1;
  limit binary_integer := 100000000;
begin
  while num < limit loop
    num := num + incr;
  end loop;
end;
/ 

PL/SQL procedure successfully completed.

Elapsed: 00:00:05.81
ex:3
declare
  num   pls_integer := 0;
  incr  pls_integer := 1;
  limit pls_integer := 100000000;
begin
  while num < limit loop
    num := num + incr;
  end loop;
end;
/