Restore and Recover Fuzzy datafiles

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Restore and Recover Fuzzy datafiles

Restore and Recover Fuzzy datafiles

2006-05-25 - By Sinardy Xing

Reply: 1 2 3 4 5 6 7 8

Hi guys, thanks for the reply here are the result

I used _allow_resetlogs_corruption

recreate the controlfile

open resetlogs

now I have ORA-01092 (See ORA-01092.ora-code.com) (search metalink only hit 2 results)

is upgraded 9i from 8i on W2K

still searching for solution

On 5/26/06, Andrey Kriushin <Andrey.Kriushin@(protected)> wrote:
>
> It seems, that Mark W. Farnham's reply didn't get into the list, so I'll
> quote his valuable response.
>
> Probably, things have changed in some way at least starting from 9i. Now
> there is always an extra block at the beginning of each datafile (so called
> "zero" block) with some info about platform, actual file size etc, so the
> total file size is BLOCKS+1.
>
> I've dumped the last block before and after "begin backup", with
> checkpoint and log switch - nothing was changed there and the datafile size
> was not changed either.
>
> HTH
>
>
> - Andrey
>
> Mark W. Farnham wrote:
>
> All versions I'm aware of, though I haven't dumped the end of a 10g, and
> maybe not a 9i, either.
>
>
>
> If you create a datafile, you'll probably notice that the size on disk is
> at least 1 datablock size larger than you asked for. The very last OS set of
> blocks adding up to the database block size is the same as the very first
> one, except for a few key values that get resynchronized at checkpoints if I
> remember correctly. If I recall correctly one of the values in these blocks
> is also whether the tablespace was in backup. Prior to being able to lie to
> the database with a command and "end backup" (intended really not for copies
> of datafiles, but the current datafiles which cannot be block fractured in
> the case that the database crashes while in backup mode), you had to
> manually adjust that ending shadow end of the file block or Oracle would
> still know something was "wrong" with the file.
>
>
>
> This is also the reason why you have to make raw partitions a little
> bigger than the datafile you want to create there. I always thought it was
> funny (strange, odd sense of funny) that Oracle gave you one block less than
> the create size and took up one block more than the create size.
>
>
>
> If someone remembers the precise details of which programs update these
> blocks and under what conditions, and is free to disclose it, I'd enjoy
> reading that as well.
>
>
>
> In the case below, if DB writer is suspended for the split and the plex
> split operation generates a clean copy (note that that engineering detail is
> not necessarily required if the volume manager is only promising that the
> plexes remaining associated with the volume are identical, and there is
> possibly extra work flushing things at split time), then you're not going to
> have fracture blocks.
>
>
>
> You get fractured blocks when an OS utility copying OS sectors (usually
> 512 bytes) ends a particular read in the middle of an Oracle block and then
> the database writer writes the Oracle block before the next OS read starts.
>
>
>
>
>
> Regards,
>
>
>
> mwf
>
>
>
> -- --Original Message-- --
> *From:* oracle-l-bounce@(protected) [
> mailto:oracle-l-bounce@(protected) <oracle-l-bounce@(protected)>]*On
> Behalf Of *Andrey Kriushin
> *Sent:* Thursday, May 25, 2006 10:05 AM
> *To:* mwf@(protected)
> *Cc:* Oracle-L Freelists
> *Subject:* Re: Restore and Recover Fuzzy datafiles
>
>
>
>
> Never heard of "ending block". What version it was then? Mark, could you,
> please, clarify?
>
> [skipped]
>
> TIA
>
> - Andrey
>
> Mark W. Farnham wrote:
>
> Before you could tell the database to "end" backup, you also had to patch
> the beginning and ending blocks of the file (lie to Oracle) so that Oracle
> did not consider the file to be "fuzzy," but I doubt you're working with a
> vintage of the Oracle software that old. If you are, you'll need some kind
> of binary block editor.
>
>

--
regards,

Sinardy

Hi guys, thanks for the reply here are the  result 
 
I used _allow_resetlogs_corruption 
 
recreate the controlfile 
 
open resetlogs 
 
now I have ORA-01092 (See ORA-01092.ora-code.com) (search metalink only hit 2 results) 
 
is upgraded 9i from 8i on W2K 
 
still searching for solution 
 
 
 
 <div>On 5/26/06, Andrey Kriushin <<a href="mailto:Andrey.Kriushin@(protected)">Andrey
.Kriushin@(protected)</a>> wrote:<blockquote class="gmail_quote" style=
"border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding
-left: 1ex;">
<div>

<div bgcolor="#ffffff" text="#000000">
It seems, that Mark W. Farnham's reply didn't get into the list, so
I'll quote his valuable response. 
 
Probably, things have changed in some way at least starting from 9i.
Now there is always an extra block at the beginning of each datafile
(so called "zero" block) with some info about platform, actual file
size etc, so the total file size is BLOCKS+1. 
 
I've dumped the last block before and after "begin backup", with
checkpoint and log switch - nothing was changed there and the datafile
size was not changed either. 
 
HTH</div><div> 
 
- Andrey 
 
Mark W. Farnham wrote:
</div><div><blockquote cite="http://midKNEIIDHFLNJDHOOCFCDKEEAHICAA.mwf
@(protected)" type="cite">

<div></div><div>
All versions I'm aware
of, though I haven't dumped the end of a 10g, and
maybe not a 9i, either.
 
If you create a datafile,
you'll probably notice that the size on disk
is at least 1 datablock size larger than you asked for. The very last
OS set of
blocks adding up to the database block size is the same as the very
first one,
except for a few key values that get resynchronized at checkpoints if I
remember correctly. If I recall correctly one of the values in these
blocks is
also whether the tablespace was in backup. Prior to being able to lie
to the
database with a command and "end backup" (intended really not for
copies of
datafiles, but the current datafiles which cannot be block fractured in
the
case that the database crashes while in backup mode), you had to
manually
adjust that ending shadow end of the file block or Oracle would still
know
something was "wrong" with the file.
 
This is also the reason
why you have to make raw partitions a little
bigger than the datafile you want to create there. I always thought it
was
funny (strange, odd sense of funny) that Oracle gave you one block less
than
the create size and took up one block more than the create size.
 
If someone remembers the
precise details of which programs update these
blocks and under what conditions, and is free to disclose it, I'd enjoy
reading
that as well.
 
In the case below, if DB
writer is suspended for the split and the plex
split operation generates a clean copy (note that that engineering
detail is
not necessarily required if the volume manager is only promising that
the
plexes remaining associated with the volume are identical, and there is
possibly extra work flushing things at split time), then you're not
going to
have fracture blocks.
 
You get fractured blocks
when an OS utility copying OS sectors (usually
512 bytes) ends a particular read in the middle of an Oracle block and
then the
database writer writes the Oracle block before the next OS read starts.
 
 
Regards,
 
mwf
 

-- --Original
Message-- -- 
From:
<a href="mailto:oracle-l-bounce@(protected)" target="_blank" onclick="return
top.js.OpenExtLink(window,event,this)">oracle-l-bounce@(protected)</a> [<a
href="mailto:oracle-l-bounce@(protected)" target="_blank" onclick="return top
.js.OpenExtLink(window,event,this)">
mailto:oracle-l-bounce@(protected)</a>]On
Behalf Of Andrey Kriushin 
Sent: Thursday, May
25, 2006 10:05
AM 
To: <a href="mailto:mwf@(protected)
.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">mwf
@(protected)</a> 
Cc: Oracle-L Freelists 
Subject: Re: Restore
and Recover
Fuzzy datafiles
 
 
Never heard of "ending block". What version it was then? Mark, could
you, please, clarify? 
</div><div>
</div>
</blockquote>
[skipped]</div><div> 
<blockquote cite="http://midKNEIIDHFLNJDHOOCFCDKEEAHICAA.mwf@(protected)" type=
"cite">
<div>
TIA 
 
- Andrey 
 
Mark W. Farnham wrote: 

Before
you could tell the database to "end" backup, you also
had to patch the beginning and ending blocks of the file (lie to
Oracle) so
that Oracle did not consider the file to be "fuzzy," but I doubt you're
working
with a vintage of the Oracle software that old. If you are, you'll need
some
kind of binary block editor.
</div>

</blockquote>
</div><div></div>

</div></blockquote></div> -- regards, Sinardy