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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Oracle Parallel Server
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...
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
bawamanpreet_at_runbox.com 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
> bawamanpreet_at_runbox.com 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
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Tim Gorman INET: Tim_at_SageLogix.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Fri May 24 2002 - 09:58:27 CDT
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