On Jun 15, 2001 at 04:05:49PM, Christopher Spence wrote:
> >In Oracle, you will get an "inconsistent"
> >image of the data file, but that is true
> >with any "manual" hot backup - cpio, tar,
> >cp, etc. It is not a problem - iff the
> >tablespace(s) are in backup mode.
> >(Wasn't there something about this on the OCP exam?)
>
> This is exactly the reason why Oracle will write full blocks to the redo
> logs during tablespace backup mode. Yes, the block is inconsistent, but if
It's done if a block appears in the buffer cache -- the full image
of a block is written. If the block remains in the buffer cache
for a long period of time the regular logging will be done. If it's
flushed and loaded again (and the tablespace still in hot backup
mode) -- the full image block will be logged again. It's not a
logical approach but it's done like that. RMAN can be used to
eliminate such a behavior for some heavy loaded systems.
--
Vladimir Begun | The more things change, the more they'll
http://vbegun.net/ | never be the same again.
http://vbegun.net/wap/ |
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