| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Mailing Lists -> Oracle-L -> Re: dbv - Found block already marked corrupted
Actually, bbed is quite well documented at Rama Velpuri's place.
The utility itself, is, however, password protected. If you want
to read more about that oracle hacking utility, go to:
http://www.fors.com/velpuri2/Oracle%20block%20structure/BBED
I tried obtaining the password, to no avail. It is quite well protected, and with a reason. This utility makes it possible to edit database blocks directly. I would never want to use DUL or BBED if I don't really, really have to.
On 02/02/2004 10:12:42 AM, "Bobak, Mark" wrote:
> Actually, there is a utility that can do what you want. It's called
> bbed. But, since it's possible, even easy, to not only shoot
> yourself
> in the foot, but actually blow an entire leg off, that's all I'll say
> about it. ;-)
>
> -Mark
>
> Mark J. Bobak
> Oracle DBA
> ProQuest Company
> Ann Arbor, MI
> "Imagination was given to man to compensate him for what he is not,
> and
> a sense of humor was provided to console him for what he is."
> --Horace
> Walpole
>
>
> -----Original Message-----
> From: Kaing, Leng [mailto:Leng.Kaing_at_team.telstra.com]=20
> Sent: Sunday, February 01, 2004 8:55 PM
> To: oracle-l_at_freelists.org
> Subject: Re: dbv - Found block already marked corrupted
> Importance: High
>
>
> Mladen,
>
> You're of course right again! I've done all I can - rebuilt the
> index,
> =
> =3D
> dropped the index, created the index, yet the block is still reported
> as
> =3D
> already marked corrupted. And this time when I do a cdba it points to
> an
> =3D
> empty block. Why isn't there a utility to unmark an empty block that
> was
> =3D
> previoiusly "marked corrupted"!
>
> I've almost lost faith in this utility now (or maybe I already have!)
> =
> =3D
> We've just scheduled a weekly job to do a dbv to detect coruption.
> Now
> =
> =3D
> I'm getting tons of blocks marked corrupted even though they're clean
> =
> =3D
> (I know because we do a drop and import from production every night!)
> It
> =3D
> would take me forever to make a list and say "if this block for this
> =3D
> database comes up, ignore it" ARGH!!!
>
> Yes, I'm waiting for the unflag utility too.=3D20
>
> Leng.
>
> ----------------------------------------------------------------
> Date: Fri, 30 Jan 2004 16:02:41 -0500
> From: Mladen Gogala <mladen_at_wangtrading.com>
> Subject: Re: dbv - Found block already marked corrupted
>
> On 01/30/2004 03:46:04 PM, Tim Gorman wrote:
>
> > One further question, though...
> >=3D20
> > >> Of course, if someone knows a utility to un-flag a block I'm all
> > ears.
> >=3D20
> > Why would anyone want to "unflag" a block that has been flagged as
> > corrupt?
> > I'm all ears for that... :-)
> >=3D20
> > -Tim
>
>
> Actually, not all corrupt blocks are the same. The definition of a
> =3D20
> corrupt block is "a block with a bad checksum". These bad checksums
> are
> mostly caused by software. I have a ton of experience with "corrupt =
> =3D20
> blocks" which came into being after copying production database to
> =3D20
> development database using BCVs. This means hot backup and instance =
> =3D20
> recovery. For the reasons of speed, the tables with the computed data
> =3D20
> were created with "NOLOGGING" attribute and when access was attempted
> =3D20
> in the cloned instance, oracle started screaming about "corrupted
> =3D20
> blocks". When the table was truncated and the data computed again,
> the
> =3D
>
> "corruption" was gone. In other words, so called "corrupt blocks" can
> simply be flagged "honest" and reused, if they're empty.
>
>
>
> ----------------------------------------------------------
> Leng Kaing
> Email: leng.kaing_at_team.telstra.com
> Phone: +61-3-9203-7589
> Mobile: +61-417-371-348
>
> ----------------------------------------------------------------
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> ----------------------------------------------------------------
> To unsubscribe send email to: oracle-l-request_at_freelists.org
> put 'unsubscribe' in the subject line.
> --
> Archives are at http://www.freelists.org/archives/oracle-l/
> FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
> -----------------------------------------------------------------
> ----------------------------------------------------------------
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> ----------------------------------------------------------------
> To unsubscribe send email to: oracle-l-request_at_freelists.org
> put 'unsubscribe' in the subject line.
> --
> Archives are at http://www.freelists.org/archives/oracle-l/
> FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
> -----------------------------------------------------------------
>
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Mon Feb 02 2004 - 10:00:06 CST
 |
 |