Date: Wed, 27 Aug 2008 21:24:42 +0200
On Wed, 27 Aug 2008 12:01:19 -0700 (PDT), artmerar_at_yahoo.com wrote:
>Sorry for the double post, but as we are reading and seeing BACKUPSET
>and BACKUPPIECE........we can see that a piece is part of a set. But,
>if you need to break up the set into pieces, why not just make smaller
A datafile can not span multiple backupsets. A datafile can span multiple backuppieces. You could configure 2G backuppieces (max filesize for 32-bit files on some Unixes) and have a backupset of unlimited size.
>Also, how does this relate to FILESPERSET?
All files in a set will be
a) simultaneously opened b) simultaneously backupped c) get multiplexed in one backupset, so 1 block for datafile 1 isfollowed by one block for datafile 2 etc.
If you have all your datafiles on few disks, NOT configuring
filesperset (Oracle by default tries to back up as much as possible)
create an I/O bottleneck.
You could argue filesperset always needs to be 1.
>We're all new to this.....
-- Sybrand Bakker Senior Oracle DBAReceived on Wed Aug 27 2008 - 14:24:42 CDT