Report on Shared / Java Pool within SGA.

-- |----------------------------------------------------------------------------|
-- | DATABASE : Oracle                                                          |
-- | FILE     : perf_sga_free_pool.sql                                          |
-- | CLASS    : Tuning                                                          |
-- | PURPOSE  : Report on Shared / Java Pool within SGA.                        |
-- | NOTE     : As with any code, ensure to test this script in a development   |
-- |            environment before attempting to run it in production.          |
-- +----------------------------------------------------------------------------+


COLUMN pool    HEADING "Pool"
COLUMN name    HEADING "Name"
COLUMN sgasize HEADING "Allocated" FORMAT 999,999,999
COLUMN bytes   HEADING "Free" FORMAT 999,999,999


SELECT
    f.pool
  , f.name
  , s.sgasize
  , f.bytes
  , ROUND(f.bytes/s.sgasize*100, 2) "% Free"
FROM
    (SELECT SUM(bytes) sgasize, pool FROM v$sgastat GROUP BY pool) s
  , v$sgastat f
WHERE
    f.name = 'free memory'
  AND f.pool = s.pool
/