RE: Will dump block make dirty block written to disk?
- To: <Christian.Antognini@xxxxxxxxxxxx>, "Leyi Zhang (Kamus)" <kamusis@xxxxxxxxx>
- Date: Mon, 13 Mar 2006 12:52:13 -0500
Hmm....
Correct me if I'm wrong, Chris, but unless I misunderstand something,
"dirty" only really means something in the context of the block in
current mode, of which there can be only one in the buffer cache at any
time. So, the consistent read copies should just be ignored.
So, something like:
select file#, block# from v$bh where status = 'xcur' and dirty='Y';
should show you the list of dirty blocks in the cache....right?
-Mark
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Mark J. Bobak
Senior Oracle Architect
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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Christian Antognini
Sent: Monday, March 13, 2006 9:59 AM
To: Leyi Zhang (Kamus)
Cc: oracle-l@xxxxxxxxxxxxx
Subject: RE: Will dump block make dirty block written to disk?
Leyi
>I've been told another most simple method to get the answer.
>Check the v$bh.dirty, if Y means still dirty, if N means written to
>disk already.
This is possible. The problem I see is that in the buffer cache you may
have multiple versions of the same block. Some of them with the flag
DIRTY set to N, some other with Y. Therefore, to be sure, I prefer to
directly get this information from the datafile.
Regards,
Chris
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