Re: Hot backup question
- From: Yong Huang <yong321@xxxxxxxxx>
- To: William.Blanchard@xxxxxxxxxxxxx
- Date: Sat, 25 Sep 2010 20:00:04 -0700 (PDT)
--- On Sat, 9/25/10, Yong Huang <yong321@xxxxxxxxx> wrote:
...
> example to explain split blocks. I think there's still a
> danger unless DBWn and OS tool can write and read,
> respectively, to the same block at the same moment. But it's
...
Correction. "unless" should be "if" or "as long as".
By the way, these two pages
http://www.ixora.com.au/tips/block_size.htm
http://www.antapex.org/undocumented_init.txt
talk about the possibility of turning off _log_blocks_during_backup during
backup. If anybody really wants to do it (possibly invalidating support), I
would add that after backup, run dbv on the backed-up file to see if you get
any influx block. It would be nice to run dbv on a file that is being created
(if it could accept input from a pipe). But with all that hassle, it would be
easier to use RMAN instead of simulating it.
Yong Huang
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