Show table high water mark (HWM)

Answer:  Please see these scripts to display the high water mark for a table. The  following code examples will display the high water mark for a table. 

SET SERVEROUTPUT ON
SET VERIFY OFF

DECLARE
CURSOR cu_tables IS
SELECT
   a.owner,
   a.table_name
FROM all_tables a
WHERE a.table_name = Decode(Upper('&&1'),'ALL',a.table_name,Upper('&&1'))
AND a.owner = Upper('&&2');

op1 NUMBER;
op2 NUMBER;
op3 NUMBER;
op4 NUMBER;
op5 NUMBER;
op6 NUMBER;
op7 NUMBER;
BEGIN

Dbms_Output.Disable;
Dbms_Output.Enable(1000000);
Dbms_Output.Put_Line('TABLE UNUSED BLOCKS TOTAL BLOCKS HIGH WATER MARK');
Dbms_Output.Put_Line('------------------------------ --------------- --------------- ---------------');
FOR cur_rec IN cu_tables LOOP
Dbms_Space.Unused_Space(cur_rec.owner,cur_rec.table_name,'TABLE',op1,op2,op3,op4,op5,op6,op7);
Dbms_Output.Put_Line(RPad(cur_rec.table_name,30,' ') ||
LPad(op3,15,' ') ||
LPad(op1,15,' ') ||
LPad(Trunc(op1-op3-1),15,' '));
END LOOP;

END;
/

SET VERIFY ON

In this version of an Oracle table high-water mark script, you pass the table_name as an argument to the code:

set linesize 300
set serveroutput on
set verify off

declare
  cursor cu_tables is
    select a.owner,
           a.table_name
    from   all_tables a
    where  a.table_name = decode(upper('&&table_name'),'all',a.table_name,upper('&&table_name'))
    and    a.owner      = upper('&&table_owner')
    and    a.partitioned='no'
    and    a.logging='yes'
order by table_name;

  op1  number;
  op2  number;
  op3  number;
  op4  number;
  op5  number;
  op6  number;
  op7  number;
begin

  dbms_output.disable;
  dbms_output.enable(1000000);
  dbms_output.put_line('table                             unused blocks     total blocks  high water mark');
  dbms_output.put_line('------------------------------  ---------------  ---------------  ---------------');
  for cur_rec in cu_tables loop
    dbms_space.unused_space(cur_rec.owner,cur_rec.table_name,'table',op1,op2,op3,op4,op5,op6,op7);
    dbms_output.put_line(rpad(cur_rec.table_name,30,' ') ||
                         lpad(op3,15,' ')                ||
                         lpad(op1,15,' ')                ||
                         lpad(trunc(op1-op3-1),15,' '));
  end loop;

end;
/

Here is another script to display the HWM fr an Oracle table.  Note that you must specify the table_name in the script:

set linesize 300
set serveroutput on
set verify off
declare
l_fs1_bytes number;
l_fs2_bytes number;
l_fs3_bytes number;
l_fs4_bytes number;
l_fs1_blocks number;
l_fs2_blocks number;
l_fs3_blocks number;
l_fs4_blocks number;
l_full_bytes number;
l_full_blocks number;
l_unformatted_bytes number;
l_unformatted_blocks number;
begin
dbms_space.space_usage(
segment_owner => user,
segment_name => 'TEST',
segment_type => 'TABLE',
fs1_bytes => l_fs1_bytes,
fs1_blocks => l_fs1_blocks,
fs2_bytes => l_fs2_bytes,
fs2_blocks => l_fs2_blocks,
fs3_bytes => l_fs3_bytes,
fs3_blocks => l_fs3_blocks,
fs4_bytes => l_fs4_bytes,
fs4_blocks => l_fs4_blocks,
full_bytes => l_full_bytes,
full_blocks => l_full_blocks,
unformatted_blocks => l_unformatted_blocks,
unformatted_bytes => l_unformatted_bytes
);
dbms_output.put_line(' FS1 Blocks = '||l_fs1_blocks||' Bytes = '||l_fs1_bytes);
dbms_output.put_line(' FS2 Blocks = '||l_fs2_blocks||' Bytes = '||l_fs2_bytes);
dbms_output.put_line(' FS3 Blocks = '||l_fs3_blocks||' Bytes = '||l_fs3_bytes);
dbms_output.put_line(' FS4 Blocks = '||l_fs4_blocks||' Bytes = '||l_fs4_bytes);
dbms_output.put_line('Full Blocks = '||l_full_blocks||' Bytes = '||l_full_bytes);
end;
/

Also see these related notes to the HWM for a table:

Using dbms_space_usage

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