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Re: Backup Strategy

From: Igor Neyman <ineyman_at_perceptron.com>
Date: Fri, 25 Jan 2002 13:09:19 -0800
Message-ID: <F001.003FBC98.20020125130746@fatcity.com>

That's fine. I'm in the good mood, TGIF... and I just resolved another 'customer issue' (has nothing to do with backup/recovery :)
Hopefully, it's the last one for this week.

Igor Neyman, OCP DBA
ineyman_at_perceptron.com

> Ditto.
>
> Tim,
>
> I think we should save all these emails, so when Igor posts a message
asking
> for help on recovering a database that won't recover for some reason
then...
>
> Sorry, Igor I couldn't resist.
>
> Chris
>
> -----Original Message-----
> Sent: Friday, January 25, 2002 2:39 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Igor,
>
> I think your missing the point... You state...
>
> "But, I'll take my chances, because as I said before, MetaLink
Note:139327.1
> didn't convince me at all that "OCOPY" is any better than regular "NT
Copy"
> command."
>
> But, I assume that the opposite is also true? "NT Copy" isn't any better
> then "OCOPY"? My assumption is that they are functionality equivalent and
> perform about the same? But, the big difference is that "OCOPY" is the
> supported way to perform backups on NT while "NT Copy" is not... So why
> "take a chance" when it doesn't gain you any benefit? If "NT Copy" is
> significantly better then "OCOPY" for some reason then let me know...
Then
> maybe you have a risk/reward argument that I can understand... If not,
why
> gamble for zero gain?
>
> Tim
>
> -----Original Message-----
> Sent: Friday, January 25, 2002 2:07 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Well, I know what you mean.
> But, I'll take my chances, because as I said before, MetaLink
Note:139327.1
> didn't convince me at all that "OCOPY" is any better than regular "NT
Copy"
> command.
>
> Besides, I am keeping two generations of backup (the latest and the one
> prior to that), so if anything goes wrong with the latest backup image of
> the db file, I can always recover, using older backup and archived
RedoLogs
> from both backups.
>
> Also, our customers wouldn't wait for Oracle support , and having two
> generations of backups, I can resolve potential issues much faster than
...
>
> Igor Neyman, OCP DBA
> ineyman_at_perceptron.com
>
>
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Friday, January 25, 2002 12:30 PM
>
>
> > Igor,
> >
> > That sounds good, but what is Oracle Support going to say when you call
> them
> > for support on a database recovery and you mention that you used NT
COPY??
> > Your hosed, if there attitude is you should have used OCOPY so we can't
> help
> > you.
> >
> > Chris
> >
> > -----Original Message-----
> > Sent: Friday, January 25, 2002 11:26 AM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > Ok, I guess, I owe some explanation here, since I've got a lot of
spanking
> > (replies, some rather sarcastic) regarding this issue.
> > My original note comes from my "real life" experience, so I'm still
> standing
> > behind it.
> > Sorry, it'll be kind of long, but if you are really interested...
> >
> > Couple years ago, when we were preparing first release of our product, I
> > read of course about "NT Copy" versus "Oracle Ocopy".
> > Still I decided to test it, because not always I trust what I read, and
I
> > like to get proof myself.
> > Testing of online ("hot") backup/recovery scenario showed, that using
"NT
> > Copy" command in backup scripts is perfectly fine, when creating backup
> set
> > of files on the disk. And there is no problem restoring from this
backup.
> > Now this "disk backup" set of files could be saved on tape, using
NTBACKUP
> > (that's the one, that really can not copy file, if it's opened by some
> other
> > program. But that's not the case with prepared in advance "disk
backup").
> > "NT Copy" has no problems copying files opened already by Oracle, and
> backup
> > is consistent, as long of course as I am using "alter tablespace <name>
> > begin backup" before copying relevant files and "alter tablespace <name>
> end
> > backup" after finishing files copy.
> > So, those scripts (using "NT Copy") were put into production, and now
have
> > been used for more than two years on more than hundred
installations/sites
> > (the number keeps growing).
> > From time to time, our field engineers are bringing back to me sets of
> > online (can not use "cold" backup - our systems should run 24*7, I'm not
> > saying they are, but we are trying to minimize downtime) backed up files
> (db
> > files and archived RedoLog files), and I recover them with no problem
(we
> > need this, to test how the upgrade to next release of our product will
run
> > against "real" customers data).
> >
> > Now, about MetaLink Note:139327.1
> > It says:
> > <quote>
> > Ocopy opens the file using CreateFile() with the FILE_SHARE_READ and
> > FILE_SHARE_WRITE flags. This allows writing to continue while we take
the
> > backup. Inconsistencies in the backup are repaired by applying archived
> > redo during recovery. The 'copy' command from NT doesn't use these
flags
> > since it wants to prevent writes to the file while the copy is taking
> > place.
> > </quote>
> >
> > I don't think, it's very accurate, and here is why:
> > When during online backup I run "NT copy" against db file, the file is
> > already opened by Oracle (at moment, when I "open" the database).
> > So, even if "NT copy" opens file without FILE_SHARE_READ and
> > FILE_SHARE_WRITE flags, all it means is that "Subsequent open
operations
> on
> > the object will fail" (quote from NT docs). I want you to notice, it
says
> > "Subsequent open operations" not "Subsequent write/read operations".
So,
> > all it does is prohibiting some other program/process from "opening" the
> > file. But Oracle, as I mentioned, has this file already opened, and it
is
> > perfectly capable of reading/writing this file.
> > Of course, the image of the saved file will be "fuzzy", and that's why
> when
> > recovering from online backup we are applying archived RedoLog files
> (which
> > getting written much more intensely during online backup).
> >
> > As for Peter McLarty note, that he "never knew that NT copy could
manage
> > keeping the CSN number in sync",
> > well it ("NT Copy") does not have to (neither does "Oracle Ocopy") keep
> CSN
> > number in sync.
> > Oracle updates file header with checkpoint SCN, when we issue "alter
> > tablespace <name> begin backup". Then until "alter tablespace <name>
end
> > backup", file header will cease updating. And SCN, written in the
> beginning
> > provides the info, which archived RedoLog files should be used for
> recovery.
> >
> > Now, please correct me, if I'm wrong.
> >
> > Igor Neyman, OCP DBA
> > ineyman_at_perceptron.com
> >
> >
> > ----- Original Message -----
> > To: <ORACLE-L_at_fatcity.com>
> > Cc: <ineyman_at_perceptron.com>
> > Sent: Thursday, January 24, 2002 6:47 PM
> >
> >
> > > > Wrong. NT 'COPY' has no problems copying 'opened' oracle db files.
> > > > I'm using it in 'hot backup' scripts on many dozens systems, and it
> > > works
> > > > fine.
> > >
> > > Igor, you sure about that?
> > >
> > > There are backup packages (such as Backup Exec ) that use their
> > > own file open copy program to avoid using copy.exe.
> > >
> > > Have you restored any of these backups made with copy?
> > >
> > > Jared
> > >
> > > Note:139327.1
> > > Subject:
> > > Differences between Windows NT COPY and Oracle
> > > OCOPY When Doing Backups
> > >
> > > Creation Date: 03-APR-2001
> > > Last Revision Date: 04-DEC-2001
> > >
> > > PURPOSE
> > > A comparison of the differences between the Windows NT "copy"
> commnad,
> > > and
> > > the Oracle "ocopy" command. Which should be used during an online
> > > backup?
> > >
> > > SCOPE & APPLICATION
> > > DBAs with databases on the Windows NT platform.
> > >
> > > The Differences between Windows NT COPY and Oracle OCOPY When Doing
> > > Backups:
> > >
> > >
> >
>



> > >
> > > When doing an online backup, should you use the Windows NT COPY
> command,
> > > or the
> > > Oracle OCOPY command?
> > >
> > > While doing online backups you should use OCOPY, or Oracle7 EBU, or
> > > Oracle8
> > > (and later) RMAN. With the OCOPY command you could copy to a backup
> > > directory
> > > on the hard drive but cannot use OCOPY to copy a file to tape. The
> other
> > > option
> > > if you do not want to use ocopy to perform your backup as this does
> > > require a
> > > lot of disk space is EBU/RMAN that comes with Oracle. Depending on
your
> > > Oracle
> > > version, the distribution includes a utility called EBU (Oracle7) or
> RMAN
> > >
> > > (Oracle8 and later) that can be used for online recovery as well. You
> > > will need
> > > to use a media management product to move the data from RMAN to tape.
> > > Legato
> > > Storage Manager is provided however there are other products that are
> > > supported
> > > to be used with this tool.
> > >
> > > To backup you will need to use the utility delivered by Oracle, the
> ocopy
> > >
> > > command. Utilities like the NT commands copy, xcopy CANNOT be used to
> > > back up.
> > > The Windows NT feature to be aware of is that NT Backup does not
allow
> > > files in
> > > use to be copied, so you must use the OCOPY utility that Oracle
> provides
> > > to
> > > copy the open database files to another disk location. Since OCOPY
> cannot
> > > copy
> > > files directly to tape, you will then need to use NT Backup or copy
or
> a
> > > similar utility to copy the files to tape, as required.
> > >
> > > OCOPY allows writing to continue while the backup is running. The NT
> COPY
> > > is a
> > > closed copy and the files may be marked either as "fuzzy" or
"corrupt."
> > > Ocopy
> > > opens the file using CreateFile() with the FILE_SHARE_READ and
> > > FILE_SHARE_WRITE
> > > flags. This allows writing to continue while we take the backup.
> > > Inconsistencies in the backup are repaired by applying archived redo
> > > during
> > > recovery. The 'copy' command from NT doesn't use these flags since it
> > > wants to
> > > prevent writes to the file while the copy is taking place.
> > >
> > >
> > >
> > >
> > >
> > >
> > > "Igor Neyman" <ineyman_at_perceptron.com>
> > > Sent by: root_at_fatcity.com
> > > 01/24/02 01:05 PM
> > > Please respond to ORACLE-L
> > >
> > >
> > > To: Multiple recipients of list ORACLE-L
> > <ORACLE-L_at_fatcity.com>
> > > cc:
> > > Subject: Re: Backup Strategy
> > >
> > >
> > > I took a quick look at this paper, and found right away, that it's not
> > > very
> > > accurate, at least in one issue.
> > > i.e., it states :
> > > < quote>
> > > The Windows NT command COPY can be used to create a cold backup of a
> > > database. It cannot be used to make a
> > > hot backup. Attempting to perform a hot backup with COPY will usually
> > > result
> > > in an error message being generated
> > > as the COPY command fails - during a hot backup the database is
running
> > > and
> > > thus the database files are locked by
> > > the Oracle database process, and COPY cannot work on a file that is so
> > > locked.
> > > < /quote>
> > >
> > > Wrong. NT 'COPY' has no problems copying 'opened' oracle db files.
> > > I'm using it in 'hot backup' scripts on many dozens systems, and it
> works
> > > fine.
> > >
> > > Don't know about the accuracy of the rest of the paper, didn't have
time
> > > to
> > > read it all.
> > >
> > > Igor Neyman, OCP DBA
> > > ineyman_at_perceptron.com
> > >
> > >
> > > ----- Original Message -----
> > > To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> > > Sent: Thursday, January 24, 2002 7:35 AM
> > >
> > >
> > > > Hi All,
> > > >
> > > > http://www.geocities.com/tbcox23/
> > > >
> > > > Go here and get the paper.
> > > >
> > > > Regards
> > > > Venkat
> > > > --
> > > >
> > > > On Thu, 24 Jan 2002 03:25:17
> > > > Bunyamin K. Karadeniz wrote:
> > > > >If possible , I want one copy too.
> > > > >Bunyamin
> > > > >----- Original Message -----
> > > > >To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > > > >Sent: Thursday, January 24, 2002 12:30 PM
> > > > >
> > > > >
> > > > >> Can you send me one (NT backup strategy)
> > > > >>
> > > > >> Regards,
> > > > >> Ramesh D Papnoi
> > > > >> Oracle DBA @ Chemtex Global Engineers Pvt. Ltd., Mumbai, India
> > > > >> (BrainBench & Brainbuzz Certified Oracle 8/8i DBA & Developer)
> > > > >> http://www22.Brinkster.com/rpapnoi
> > > > >>
> > > > >> ---------- Original Text ----------
> > > > >>
> > > > >> To: internet["Multiple recipients of list ORACLE-L"
> > > > ><ORACLE-L_at_fatcity.com>]
> > > > >>
> > > > >> Please send me one. (NT) Thank,
> > > > >>
> > > > >> grace wrote:
> > > > >> >
> > > > >> > can u also send me a copy on backup strategy on nt.
> > > > >> > thanks
> > > > >> >
> > > > >> > ----- Original Message -----
> > > > >> > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > > > >> > Sent: Wednesday, January 23, 2002 3:25 PM
> > > > >> >
> > > > >> > > Hello Hamid
> > > > >> > >
> > > > >> > > I would like to have this paper as well.
> > > > >> > > We are now revising our Backup strategy.
> > > > >> > >
> > > > >> > > Yechiel Adar, Mehish Computer Services
> > > > >> > > adary_at_mehish.co.il
> > > > >> > >
> > > > >> > > > -----Original Message-----
> > > > >> > > > From: Mohan, Ross [SMTP:MohanR_at_STARS-SMI.com]
> > > > >> > > > Sent: Tue, January 22, 2002 6:35 PM
> > > > >> > > > To: Multiple recipients of list ORACLE-L
> > > > >> > > > Subject: RE: Backup Strategy
> > > > >> > > >
> > > > >> > > > Hamid,
> > > > >> > > >
> > > > >> > > > Would you be willing to forward a copy of
> > > > >> > > > this paper?
> > > > >> > > >
> > > > >> > > > Thanks,
> > > > >> > > >
> > > > >> > > > Ross Mohan
> > > > >> > > >
> > > > >> > > > -----Original Message-----
> > > > >> > > > Sent: Thursday, January 17, 2002 12:27 PM
> > > > >> > > > To: Multiple recipients of list ORACLE-L
> > > > >> > > >
> > > > >> > > >
> > > > >> > > > Hi List,
> > > > >> > > > I have a white paper for Backup Strategy on Microsoft NT
but
> I
> > > am
> > > > >> > looking
> > > > >> > > > for Backup Strategy for Oracle8i on Solaris, If anybody
have
> > > any
> > > doc
> > > > >or
> > > > >> > > > link
> > > > >> > > > I realy appreciate.
> > > > >> > > >
> > > > >> > > >
> > > > >> > > >
> > > > >> > > >
> > > > >> > > > Hamid Alavi
> > > > >> > > > Office 818 737-0526
> > > > >> > > > Cell 818 402-1987
> > > > >> > > >
> > > > >> > > > The information contained in this message and any
attachments
> > > is
> > > > >> > intended
> > > > >> > > > only for the use of the individual or entity to which it is
> > > > >addressed,
> > > > >> > and
> > > > >> > > > may contain information that is PRIVILEGED, CONFIDENTIAL
and
> > > exempt
> > > > >from
> > > > >> > > > disclosure under applicable law. If you have received this
> > > message
> > > > >in
> > > > >> > > > error,
> > > > >> > > > you are prohibited from copying, distributing, or using the
> > > > >information.
> > > > >> > > > Please contact the sender immediately by return e-mail and
> > > delete
> > > > >the
> > > > >> > > > original message from your system.
> > > > >> > > > --
> > > > >> > > > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > > > >> > > > --
> > > > >> > > > Author: Hamid Alavi
> > > > >> > > > INET: hamid.alavi_at_quovadx.com
> > > > >> > > >
> > > > >> > > > Fat City Network Services -- (858) 538-5051 FAX: (858)
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> > > > >--
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> > > > >--
> > > > >Author: Bunyamin K. Karadeniz
> > > > > INET: bunyamink_at_havelsan.com.tr
> > > > >
> > > > >Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
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> > > >
> > > > --
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> > > > --
> > > > Author: C.S.Venkata Subramanian
> > > > INET: csvenkata_at_lycos.com
> > > >
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> > >
> > > --
> > > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > > --
> > > Author: Igor Neyman
> > > INET: ineyman_at_perceptron.com
> > >
> > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> > > San Diego, California -- Public Internet access / Mailing Lists
> > > --------------------------------------------------------------------
> > > To REMOVE yourself from this mailing list, send an E-Mail message
> > > to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> > > the message BODY, include a line containing: UNSUB ORACLE-L
> > > (or the name of mailing list you want to be removed from). You may
> > > also send the HELP command for other information (like subscribing).
> > >
> > >
> > >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Igor Neyman
> > INET: ineyman_at_perceptron.com
> >
> > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> > San Diego, California -- Public Internet access / Mailing Lists
> > --------------------------------------------------------------------
> > To REMOVE yourself from this mailing list, send an E-Mail message
> > to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> > the message BODY, include a line containing: UNSUB ORACLE-L
> > (or the name of mailing list you want to be removed from). You may
> > also send the HELP command for other information (like subscribing).
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Grabowy, Chris
> > INET: cgrabowy_at_fcg.com
> >
> > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> > San Diego, California -- Public Internet access / Mailing Lists
> > --------------------------------------------------------------------
> > To REMOVE yourself from this mailing list, send an E-Mail message
> > to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> > the message BODY, include a line containing: UNSUB ORACLE-L
> > (or the name of mailing list you want to be removed from). You may
> > also send the HELP command for other information (like subscribing).
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Igor Neyman
> INET: ineyman_at_perceptron.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Johnston, Tim
> INET: TJohnston_at_quallaby.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Grabowy, Chris
> INET: cgrabowy_at_fcg.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Igor Neyman
  INET: ineyman_at_perceptron.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).
Received on Fri Jan 25 2002 - 15:09:19 CST

Original text of this message

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