db_cache_advice script in oracle 10g

COLUMN size_for_estimate          FORMAT 999,999,999,999 heading 'Cache Size (MB)'
COLUMN buffers_for_estimate       FORMAT 999,999,999 heading 'Buffers'
COLUMN estd_physical_read_factor  FORMAT 999.90 heading 'Estd Phys|Read Factor'
COLUMN estd_physical_reads        FORMAT 999,999,999 heading 'Estd Phys| Reads'

SELECT size_for_estimate,
       buffers_for_estimate,
       estd_physical_read_factor,
       estd_physical_reads
FROM   v$db_cache_advice
WHERE  name          = 'DEFAULT'
AND    block_size    = (SELECT value
                        FROM   v$parameter
                        WHERE  name = 'db_block_size')
AND    advice_status = 'ON';