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Re: RE: RE: Online vs offline backups

From: Alexandre Gorbatchev <alexandre.gorbatchev_at_avermann.de>
Date: Wed, 19 Jun 2002 08:48:38 -0800
Message-ID: <F001.004816FA.20020619084838@fatcity.com>


Oracle Documentation does NOT mention MANY MANY things.

> hi, Mercadante, Thomas F£¬ÄúºÃ£¡
> But according to Oracle Document(which i believe), oracle backup and
recovery guide (version 8.1.6)page 4-4: it said:
>
> Use operating system commands or a backup utility to make backups of
all
> datafiles and all control files specified by the CONTROL_FILES parameter
of
> the initialization parameter file. Also back up the initialization
parameter file
> and other Oracle product initialization files. To find them, do a search
for
> *.ora starting in your Oracle home directory and recursively search all of
its
> subdirectories.
> You can see, oracle mentions everything it need, but it does not mention
the online redo log.
> And:
> Is the online redo log useful in recovery since you do a full clean cold
backup? Just do a clear logfile group 1,2,3 and you cleanly opened your database when you Just restore the datafile,controlfiles.If you want to make full recovery, the online redo log is also totally USELESS. And if you carelessly overlay the old online redo log, the CURRENT ACTIVE ONLINE REDO LOG WILL BE DESTROYED! so , you cannot do complete recovery.
> This is my opinions.Though i also do not do coldbackup.
>
> Good luck!
>
> chaos
> chaospku_at_163.net
>
> zhu chao
> DBA of Eachnet.com
> 86-021-32174588-667
>
>
> ÔÚ 2002-06-19 06:43:00 You wrote:
> >chal_ping
> >
> >What? Makes no sense. Why NOT backup everything if you are taking a
Cold
> >Backup. Why make yourself perform an open reset logs upon a recovery?
> >
> >This is bad advice.
> >
> >Personally, I use Rman performing hot backups all the time. My database
is
> >*always* open to the world.
> >
> >Tom Mercadante
> >Oracle Certified Professional
> >
> >
> >-----Original Message-----
> >Sent: Wednesday, June 19, 2002 8:38 AM
> >To: Multiple recipients of list ORACLE-L
> >
> >
> >Ferenc Mantfeld£¬
> >
> >>The same person that advocated a cold backup
> >>did not back up the online redo logs, so what use was it anyway, since
the
> >>only way they would force open their DB is with a resetlogs option
anyway.
> > For cold backup, oracle does not recommend backup the online redo
> >log. And if you restore the whole cold backup, why need the online redo
log?
> >I am sure people doing cold backup will do shutdown normal/immediate, not
> >shutdown abort.So there is no need to backup the online redo log at all!
> >Backup the online redo log also take the risk of damage the current
online
> >redo log when you want to do full recovery.
> > So, never backup the online redo log when doing cold backup.
> >
> > ÖÂ
> >Àñ£¡
> >
> > chal_ping
> > chaospku_at_163.net
> >
> >--
> >Please see the official ORACLE-L FAQ: http://www.orafaq.com
> >--
> >Author: chal_ping
> > INET: chaospku_at_163.net
> >
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> >Author: Mercadante, Thomas F
> > INET: NDATFM_at_labor.state.ny.us
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> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: chaos
> INET: chaospku_at_163.net
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Alexandre Gorbatchev
  INET: alexandre.gorbatchev_at_avermann.de

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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Received on Wed Jun 19 2002 - 11:48:38 CDT

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