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 - 05:49:25 CDT
