Nested tables and Arrays

create table delete_me (id number)

declare
  i number;
begin
  for i in 0..50 loop
    insert into delete_me values(i);
  end loop;
  commit;
end;

Using Bulk Load and Fetch Limit
declare
  CURSOR C1 IS
        SELECT id from delete_me;
  mc c1%rowtype;
  i number := 0;
  fetchLimit number := 7;
  TYPE Tt IS TABLE OF number;
  mt Tt;
begin
  open c1;
  loop
    --Load nested table here
    FETCH C1 BULK COLLECT INTO mt LIMIT fetchLimit ;
    --Perform other operations here
    FOR i IN mt.first..mt.last loop
      dbms_output.put_line(mt(i));
    end loop;
    exit when c1%notfound;
    dbms_output.put_line('Chunk done');
  end loop;
  close c1;
end;

Simple manual way
declare
  CURSOR C1 IS
        SELECT id from delete_me;
  mc c1%rowtype;
  i number := 0;
  TYPE Tt IS TABLE OF number index by binary_integer;
  mt Tt;
begin
  open c1;
  loop
    --Load nested table here
    fetch c1 into mc;
    exit when (c1%notfound);
    mt(i) := mc.id;
    i := i+1;
  end loop;
  close c1;
  --Perform other operations here
  FOR i IN mt.first..mt.last loop
    dbms_output.put_line(mt(i));
  end loop;
end;