Yes, I agree. There are actually 3 "normal" oracle backup solutions.
There are some more complicated ones out there, but the main 3 are:

1) COLD

   Database is shut down completely and the backup software backs up the
datafiles. 

2) HOT
   
   Oracle puts a tablespace into a special mode where you can then copy
the datafile in a consistent way even though the database is not
shutdown

3) RMAN

   Network Module for Oracle (when configured correctly) will use Oracle
RMAN to backup the database via the Oracle SBT api. There are no file
level backups, rather than data is shipped via SBT to the driver. That's
why you install something like /usr/lib/libnwora.so so during the NMO
install. That allows Oracle to send it to the Legato backup. 


----
Matthew Huff       | One Manhattanville Rd
OTA Management LLC | Purchase, NY 10577
www.otaotr.com     | Phone: 914-460-4039
aim: matthewbhuff  | Fax:   914-460-4139

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Davina Treiber
Sent: Friday, December 14, 2007 2:49 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] oracle rman backup reports that file changed
during backup?

mark wragge wrote:
> I am using Networker Oracle Module to backup a database. The database
is therefore put into hot backup mode which i thought meant that there
was nothing written to the database while the backup is taking place.
Sometimes we receive a warning stating that the file changed during the
backup but this file is actually the database. How can this file change
during the backup if it is in hot backup mode. Do i need to be concerned
with these warnings. 
>    
>   The message is:
>   Beginning backup of tablespace WRK_DATA...
>     Backing up datafile /SRVR1_db04/dbf/WRK_DATA_01.dbf...
>   /SRVR1_db04/dbf/WRK_DATA_01.dbf
>   save: Warning - `/SRVR1_db04/dbf/WRK_DATA_01.dbf' changed during
save
>    
>   Thanks, Mark 

NMO does NOT put Oracle into backup mode. This is not how it works. NMO
is an interface between RMAN and Oracle - you still need to run an RMAN
script to backup your database. You certainly should not be running save
commands. I think you have missed something vital here and I doubt that
your backups are recoverable.

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