free buffer waits ? but SGA is full of FREE buffers !!

From: Rahul <rahul_at_ratelindo.co.id>
Date: Fri, 21 Sep 2001 22:39:05 -0700
Message-ID: <F001.00395739.20010921224017@fatcity.com>

list, (AIX, 7.3.2)
i have found another abnomality which my db is suddenly showing.. when doing a count(*) on a million row table.... the session is waiting on "free buffer waits" !! i have 80M db buffers and most of them are empty/free !!
all the free buffer waits are on one of the db file belonging to the table i am reading.
i'm runniing 4 dbwr's, and have async io set to false.

again... most of the buffers are FREE

select decode(state,0,'free',1,'Xclusive',2,'Shared',3,'Consistent

read',4,'disk read','other') STATE,     
        count(*)

from sys.x$bh
group by state
/

regards
=Rahul

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Author: Rahul
  INET: rahul_at_ratelindo.co.id

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