Oracle-L: RE: Backups

From: Steve McClure <smcclure_at_usscript.com>
Date: Thu, 03 Oct 2002 11:43:15 -0800
Message-ID: <F001.004DFDF4.20021003114315@fatcity.com>

RE: BackupsLots of folks here on the list can explain it, but really you would get more from the Oracle Backup and Recovery Manual. In short, you place your tablespaces in 'backup mode', one TS at a time is the prefered method. You backup the datafiles associated with the Tablespaces in backup mode, using cp or tar or dd or whatever you prefer. You end backup mode, perform a log switch, and backup all archived redo logs created during your backup. You do this, and you can restore your backup, and Oracle will, for the purposes of this response, magically recover your database.

Steve McClure
60% certified and counting
-----Original Message-----

From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Markham, Richard
Sent: Thursday, October 03, 2002 11:03 AM To: Multiple recipients of list ORACLE-L Subject: RE: Backups

It would be interesting to see how you would explain how either cp or dd (which know nothing of archive log mode, or the concept of hot backup, itself, none the less) is going to keep things consistent, when these utilities themselves are for point in time operations.

-----Original Message-----

From: John Weatherman [mailto:john.weatherman_at_replacements.com] Sent: Thursday, October 03, 2002 12:18 PM To: Multiple recipients of list ORACLE-L Subject: RE: Backups

This doesn't sound right. Put the database in hot backup mode, backup (whether using cp to a staging point like the poster here is doing or straight to tape using dd or dump or some other utility), come out of hot backup mode. Why wouldn't you be able to recover?

  John P Weatherman
  Database Administrator
  Replacements Ltd.

-----Original Message-----

Sent: Thursday, October 03, 2002 10:18 AM To: Multiple recipients of list ORACLE-L

If you want to be able to use any OS backup for restore/recovery that database must be closed when you do the backup. If it is not, you won't be
able to recover.

Just a thot,
Ruth

Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Thursday, October 03, 2002 9:08 AM

  Robyn,
   We used the DD method on pre 7.1 oracle with RAW devices. It worked   fine except that it used a lot of tape dumping a raw device when only a   small portion was used. Using a dd command to place a copy of the data   on tape should not be a problem if a restoral is needed. The dd function   is just another OS method of copying data to a tape. I don't know for   sure but I think there might be some issues about transportability of   the dd tape.
  Other users will know about the transportability issues.   Ron
   ROR mª¿ªm

>>> Robyn_at_iTeamTech.com 10/02/02 08:08PM >>> Hello,

I need some info about backups. I am working on a customer site, and have implemented both exports and hot backups. Both jobs copy to a separate mount point, and a job scripted by another individual then moves the files to tape.

Here's the problem - he's using a dd command, primarily because it provides a succinct output he can email to non-technicals. The file system is built on a 12 disk A1000 array. We've provided him with a ufsdump script, but he's doesn't want to use it. Can the system be recovered from this tape? Has anyone ever relied on a dd for a daily backup method? The system is Oracle 9i on Solaris 8.

Robyn

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Author: Steve McClure
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Received on Thu Oct 03 2002 - 14:43:15 CDT