Tom,
Thanks for your mail. As I mentioned in my mail, After having a long
meeting, our team decided that to be on the safe side, it is good to have
both Full and Level0 on day1. We restored successfully several times after
that. But as you said it might have been redundant. Team decision at that
time was, it was okay to be on the safe side, even if it meant being
foolish!
Coming to your questions...
- Are you using a recovery catalog?
>> YES
- Why are you placing your database in restricted mode for both scripts, the
"full" backup requires that your db in mount mode.. so no regular users can
log on, and the "level 0" to me, most likely should let your users work,
after all.. it is a hotbackup.. :)
>> We are doing the Hotbackups at 4am, when there are only batch jobs
running. No new sessions get started at that time. Infact, due to security
if anybody tries to login at that time, triggers will log them out
automatically. So we put it in Restricted mode.
- Why are you backing up the control file after the full backup? Typically
this is only needed if you aren't using a recovery catalog, and need a
controlfile with the last backup info, is this the case?
>> Again to be on the safe side! If we lose all the 3 control files, we
thought we could get the old control file from the RCAT and mount the
database. Is there any otherway to mount the database, when all control
files are lost...?
Thanks for your feedback
Rama
-----Original Message-----
From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Tom Tyson
Sent: Thursday, November 02, 2000 5:46 AM
To: Multiple recipients of list ORACLE-L
Subject: RE: RMAN backup issue
Just wanted to add my .02 cents...
The only difference between a full backup and a incremental (differential /
cummulative) backup is that one is consistent and the other is not. Another
difference is that the full backup causes every used block to get backed up,
but not unused blocks. But you only need to apply archive log files to your
iconsistent database... Other than that, you can recover just as well. I
have
had clients running for months with only Level 0's and 1's using a
incremental
cummultative backups with no problems. I've had to perform db restores, and
had no problems recovering any part of the database. A couple of questions
on
your scripts..
- Are you using a recovery catalog?
- Why are you placing your database in restricted mode for both scripts, the
"full" backup requires that your db in mount mode.. so no reqular users can
log
on, and the "level 0" to me, most likely should let your users work, after
all.. it is a hotbackup.. :)
- Why are you backing up the control file after the full backup? Typically
this is only needed if you aren't using a recovery catalog, and need a
controlfile with the last backup info, is this the case?
Anyway.. just thought I'd pipe in.. no offense meant..
Tom Tyson
- Rama Malladi <rmalladi_at_inteliant.com> wrote:
> Tom,
> FYI.. I am posting both the Full as well as Level0 backup scripts that we
> have ... Still I am not sure if Level0 is same as Full or are they
> different.. After having a long meeting we all decided that to be on the
> safe side, it is good to have both on day1. Since then we do only Level1,2
> during the week and Level0 once a week.
>
> FULL
> ====
> {
> sql 'alter system enable restricted session';
> execute script alloc_disk;
> execute script defin_maxcorrupt_for_system;
> backup full
> skip offline
> skip readonly
> skip inaccessible
> tag Back_Fulldb_hsys
> filesperset 5
> format '/backup/oracle/arbor-106/Fulldb_arborora_%t_%s_%p.bs'
> (database);
> execute script rel_disk;
> sql 'alter system switch logfile';
> execute script arch_log_current;
> allocate channel c1 type disk;
> backup current controlfile format
> '/backup/oracle/arbor-106/Control_arborora_%t_%s_%p.bs';
> release channel c1;
> sql 'alter system disable restricted session';
> execute script back_all_alog;
> }
>
> Level0
> ======
> {
> sql 'alter system enable restricted session';
> execute script alloc_disk;
> execute script defin_maxcorrupt_for_system;
> backup
> incremental level 0
> skip offline
> skip readonly
> skip inaccessible
> tag Back_Hsys_Incremental_0
> filesperset 5
> format '/backup/oracle/arbor-106/Level0_arborora_%t_%s_%p.bs'
> (database);
> execute script rel_disk;
> sql 'alter system switch logfile';
> execute script arch_log_current;
> allocate channel c1 type disk;
> backup current controlfile format
> '/backup/oracle/arbor-106/Control_arborora_%t_%s_%p.bs';
> release channel c1;
> sql 'alter system disable restricted session';
> execute script back_all_alog;
> }
>
> *************************************************
> Rama Malladi, Sr. Oracle DBA
> Oracle Certified Professional (8 and 8i)
> Inteliant Corp., California
> RMALLADI_at_inteliant.com
> *************************************************
>
> -----Original Message-----
> blair_at_pjm.com
> Sent: Wednesday, November 01, 2000 8:11 AM
> To: Multiple recipients of list ORACLE-L
>
>
> RDBMS: 8.0.5
>
> We are using RMAN to backup a critical production 600G database. We have
a
> successful level-0 backup and do level-1 backups 3 times a week. To the
> best of
> my knowledge we have never done a "Full Backup". Looking at the OEM Help
on
> topic "Backup" it looks like I don't need to do a full backup if I do
> level-0
> incrementals - but it is not clearly stated that way. Am I correct? Can
we
> forego Full Backups if we do Level-0 backups?
>
> ..tom
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author:
> INET: blair_at_pjm.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Rama Malladi
> INET: rmalladi_at_inteliant.com
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
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Received on Thu Nov 02 2000 - 17:32:45 CST
