show parameter block_size;

create table t1 ( c )
pctfree 0
as
select 'a' from dual connect by level <= 100000;

select min(count(*)), max(count(*)), avg(count(*))
from   t1
group by dbms_rowid.rowid_block_number(rowid);

create table t2 ( c )
pctfree 0
as
select lpad('a', 5) from dual connect by level <= 100000;

select min(count(*)), max(count(*)), avg(count(*))
from   t2
group by dbms_rowid.rowid_block_number(rowid);

