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Optimize your undo parameters

This script will help you optimize your UNDO parameters.

When you are working with UNDO (instead of ROLLBACK), there are two important things to consider:

  • The size of the UNDO tablespace
  • The UNDO_RETENTION parameter

There are two ways to proceed to optimize your resources.

  1. You can choose to allocate a specific size for the UNDO tablespace and then set the UNDO_RETENTION parameter to an optimal value according to the UNDO size and the database activity. If your disk space is limited and you do not want to allocate more space than necessary to the UNDO tablespace, this is the way to proceed.
  2. If you are not limited by disk space, then it would be better to choose the UNDO_RETENTION time that is best for you (for FLASHBACK, etc.). Allocate the appropriate size to the UNDO tablespace according to the database activity.
  3. This tip help you get the information you need whatever the method you choose. It was tested on Oracle9i (9.2.0.4, 9.2.0.5).

    set serverout on size 1000000
    set feedback off
    set heading off
    set lines 132
    declare
      cursor get_undo_stat is
             select d.undo_size/(1024*1024) "C1",
                    substr(e.value,1,25)    "C2",
                    (to_number(e.value) * to_number(f.value) *
    g.undo_block_per_sec) / (1024*1024) "C3",
                    round((d.undo_size / (to_number(f.value) *
    g.undo_block_per_sec)))             "C4"
               from (select sum(a.bytes) undo_size
                       from v$datafile      a,
                            v$tablespace    b,
                            dba_tablespaces c
                      where c.contents = 'UNDO' 
                        and c.status = 'ONLINE'
                        and b.name = c.tablespace_name
                        and a.ts# = b.ts#)  d,
                    v$parameter e,
                    v$parameter f,
                    (select max(undoblks/((end_time-begin_time)*3600*24))
    undo_block_per_sec from v$undostat)  g
              where e.name = 'undo_retention'
                and f.name = 'db_block_size';
    begin
    dbms_output.put_line(chr(10)||chr(10)||chr(10)||chr(10) || 'To optimize UNDO you have two choices :'); dbms_output.put_line('==================================================
    ==' || chr(10));
      for rec1 in get_undo_stat loop
          dbms_output.put_line('A) Adjust UNDO tablespace size according to UNDO_RETENTION :' || chr(10));
          dbms_output.put_line(rpad('ACTUAL UNDO SIZE ',65,'.')|| ' : ' ||
    TO_CHAR(rec1.c1,'999999') || ' MEGS');
          dbms_output.put_line(rpad('OPTIMAL UNDO SIZE WITH ACTUAL UNDO_RETENTION (' || ltrim(TO_CHAR(rec1.c2/60,'999999')) || ' MINUTES)
    ',65,'.') || ' : ' || TO_CHAR(rec1.c3,'999999') || ' MEGS');
          dbms_output.put_line(chr(10));
          dbms_output.put_line('B) Adjust UNDO_RETENTION according to UNDO tablespace size :' || chr(10));
          dbms_output.put_line(rpad('ACTUAL UNDO RETENTION ',65,'.') || ' : ' || TO_CHAR(rec1.c2/60,'999999') || ' MINUTES');
          dbms_output.put_line(rpad('OPTIMAL UNDO RETENTION WITH ACTUAL UNDO SIZE (' || ltrim(TO_CHAR(rec1.c1,'999999')) || ' MEGS) ',65,'.') || ' : ' || TO_CHAR(rec1.c4/60,'999999') || ' MINUTES');
      end loop;
    dbms_output.put_line(chr(10)||chr(10));
    end;
    /
    
    select 'Number of "ORA-01555 (Snapshot too old)" encountered since the last startup of the instance : ' || sum(ssolderrcnt)
      from v$undostat;
    

This was last published in May 2004

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