This just goes to show how little I know, good grief it never ends.
Thanks for the responses.
: )
Patrice Boivin
Systems Analyst (Oracle Certified DBA)
Systems Admin & Operations | Admin. et Exploit. des systèmes
Technology Services | Services technologiques
Informatics Branch | Direction de l'informatique
Maritimes Region, DFO | Région des Maritimes, MPO
E-Mail: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
-----Original Message-----
From: Dennis Taylor [SMTP:[EMAIL PROTECTED]]
Sent: Friday, March 09, 2001 7:26 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Does NT write to random locations on disk?
At 01:55 PM 3/9/01 -0800, you wrote:
>Oracle datafiles are formatted into blocks. Data is read either
physically
>by block or an indexed block number. If you compress using zip and
then
>uncompress, the blocks have not changed. If you reorg the file the
blocks
>will probably change and the data wont be where Oracle thinks it
is.
>
I'm working from logic rather than specific knowledge of Oracle
here, so I
could be way off base. But if you are set up to use a cooked rather
than
raw file system, then the block number that Oracle uses should be
file-relative rather than disk-relative, i.e. the block labelled
'34' would
be the 34th or 35th block *in the file* rather than *on the disk*.
No
matter how much you defrag, zip, unzip, copy, mash, spit on, or
otherwise
vilify the file, it still ends up with the same data in that block.
Theoretically.
Dennis Taylor
--------------------------------
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Author: Boivin, Patrice J
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