Try "dd if=/dev/rdsk/xxxxx | compress -c >
/dev/rmt/0" or something like that if you want to compress your backups of "raw"
devices using the standard UNIX "dd" utility. However, Oracle Support has
always been leery about the use of "compress" for backups, with regards to
possible corruption of the contents. Scan MetaLink for discussions on
this...
Most tape subsystems support hardware-based
compression, so the issue of whether compression is possible using "raw" or
"cooked" devices as input is quite irrelevant, for most
configurations.
The topic of this email thread seems to have veered
into confusion over the difference between "compression" and "block-level
incremental backups", so I'll just bail out now...
----- Original Message -----
Sent: Friday, May 24, 2002 8:18 AM
Subject: Re: Oracle Parallel Server
Manpreet,
raw disk is sliced as physical disk so that you can not compress. Do
not get confused between DD and RMAN because DD is an OS utility and RMAN
is an oracle utility they are totally different.
Regards,
Jalil
[EMAIL PROTECTED]
wrote:
OK
you can do DD ,but , can you use compression along with DD.What if you have
allocated 40-50GB to the database,but in actual only 20GB is used.RMAN can
do that.i am not too sure would DD be able to do
it.
Manpreet
> You will need to put tablespace in
backup mode and use "dd" to copy the appropriate raw device. Note that you
can't write a dynamic hotbackup script for raw disk - your script will need
to be modified whenever you added a datafile. > HTH >
Regards, > -Jalil > [EMAIL PROTECTED] wrote: What is the
best way to implement a HOT BACKUP on an Oracle Parallel Server which is
using RAW disks.Please describe the process if possible.I know it has to be
RMAN and some MML > -- > Please see the official ORACLE-L FAQ:
http://www.orafaq.com > -- > Author: > INET:
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