On 10 Jul, 11:49, sybrandb <sybra..._at_gmail.com> wrote:
> On 10 jul, 12:39, peter <hhh.datab..._at_gmail.com> wrote:
>
> > According to oracle increment backup in oracle 10g RMAN is faster then
> > oracle 9i RMAN,
> > because after enable block change tracking... oracle starts recording
> > changes in blocks in a file.
> > But in oracle 9i also oracle record changes in database to REDO LOG
> > files and how is it different.
>
> The answer to this question is obvious (as with all of your questions,
> as you never RTFM and if you RTFM, don't try to *understand* the
> documentation).
> The redo log is a *chronological* collection of what Oracle calls
> change vectors.
> If you would need to determine which blocks have been changed since
> last backup, you *obviously* would have to scan through *ALL* redologs
> since last backup.
> The block change tracking file is a bitmapped file only stating the
> fact a specific block has changed.
>
> --
> Sybrand Bakker
> Senior Oracle DBA
Received on Tue Jul 10 2007 - 07:01:43 CDT
