You can write a little perl script to write over the block. Just open the
datafile, sysseek to (block_number)*(block_size), then
syswrite(chr(0),block_size). Strangely though, the naive approach of
overwriting a block entirely with nulls results in a block which is not
detectable with dbms_repair (though you will definitely get a corrupt block
error).
If you want to be more clever (for example, altering the itl lists in the
block, which is detectable by dbms_repair), then I would recommend do a
formatted dump with alter system dump datafile .... the doing a raw dump of
the block with dd if=... ibs=block_size skip=block_number count=1, viewing
that with a hex editor and then comparing the two. The location and
structure of the header components is pretty obvious. You can then use the
method above to change what you want to change.
Of course, doing any of this can damage your database beyond repair and you
won't be supported by oracle support, etc.
George
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: Thursday, May 31, 2001 4:01 PM
>
> It apparently is only on NT, and unless you have the password,
> which is known only to Oracle Support Personnel, you can't
> use it.
>
> http://www.ixora.com.au/q+a/0101/23224038.htm
>
> Jared
>
>
> On Thursday 31 May 2001 12:10, K Gopalakrishnan wrote:
> > Hi !
> >
> >
> > The simple thing is you can edit the datablocks using
> > BBED editor. It is shipped with Oracle and You need a
> > password to use that utility. You can browse and edit
> > the data blocks.
> >
> >
> > $BBED will give the required details. BUT IT IS
> > DANGEROUS>>>>>>>>>>>>
> >
> > --- novicedba <[EMAIL PROTECTED]> wrote:
> > > hi,
> > > This may sound funny. I want to know how to
> > > corrupt a block. I want to test the different
> > > methods of identifying block corruption, but I don't
> > > have sample data blocks.
> > > Please help me
> > >
> > > novice
> >
> > =====
> > Have a nice day !!
> > ------------------------------------------------------------
> > Best Regards,
> > K Gopalakrishnan,
> > Bangalore, INDIA.
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Get personalized email addresses from Yahoo! Mail - only $35
> > a year! http://personal.mail.yahoo.com/
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Jared Still
> INET: [EMAIL PROTECTED]
>
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: George Schlossnagle
INET: [EMAIL PROTECTED]
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