Anyone observed this on their platform ? (Observations
below are from Sun, v8.1.6 and 8.1.7)
Based on various things I've seen on the web,
immediately after startup I would expect about half
the shared pool to "kept aside" by Oracle (in the
'perm' area) and only released as memory comes under
pressure.
So to prove this assertion, I set 'shared_pool = 40m',
and ran the following immediately after startup:
select ksmchcls, sum(p.ksmchsiz) tot
from sys.x$ksmsp p
group by ksmchcls;
KSMCHCLS TOT
-------- ----------
R-free 2000000
R-freea 40
free 16541304
freeabl 2514628
perm 21760488
recr 701904
which is what I would expect (ie about 50% in the
'perm' area)
So far so good... But then, if I bump up 'shared_pool'
to 70m, then I see
KSMCHCLS TOT
-------- ----------
R-free 3500000
R-freea 40
free 60401700
freeabl 2524560
perm 6409504
recr 682552
thus all of a sudden, there is minimal 'perm', and
virtually all of the memory is now deemed 'free'.
The switch over point seems to be somewhere around
68m.
Can anyone shed any light on this ??
Cheers
Connor
=====
Connor McDonald
http://www.oracledba.co.uk (mirrored at
http://www.oradba.freeserve.co.uk)
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