RE: About Hot backup.
- From: Paul Drake <discgolfdba@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 25 Mar 2004 12:54:29 -0800 (PST)
or, roll up your sleeves, create a test case, start
dumping some blocks and diff'ing them, dump some logs
and examine them.
mmm, block dumps.
#include caffeine.h
Pd
--- "Mercadante, Thomas F"
<thomas.mercadante@xxxxxxxxxxxxxxxxx> wrote:
> yeah, what Jared said.
>
> Tom Mercadante
> Oracle Certified Professional
>
>
> -----Original Message-----
> From: Jared Still [mailto:jkstill@xxxxxxxxxx]
> Sent: Thursday, March 25, 2004 10:12 AM
> To: Oracle-L Freelists
> Subject: Re: About Hot backup.
>
>
> As always, both.
>
> Just more of it will be written in the redo log
> than normal if the tablespace is in backup mode.
>
> IIRC the first time a block is written to when a
> tbs is in backup mode, the entire block is written
> to the redo log, which is not normally done.
>
> This is so that recovery can take place in the case
> of a block split during backup of the datafile.
>
> A block split can occur when the blocksize of the
> datafile and the blocksize of the database are
> different, and oracle is updating a block at the
> same time one or more (but not all) of the OS blocks
>
> that make up the database block is being written to
> the backup medium.
>
> Following that initial full block write to redo,
> deltas of that block are written to the redo.
>
> There is no doubt a lot more underlying detail, but
> that is the gist of it.
>
> This is all moot if using RMAN though, as
> tablespaces
> are not put into backup mode in that case.
>
> HTH
>
> Jared
> On Thu, 2004-03-25 at 06:37, Senthil Kumar wrote:
> > Hi,
> >
> > I have a doubt.
> > When I'm taking the hot backup, where the new data
> will be written. In the
> > datafile or in the redologs?.
> >
> > TIA
> > Ram
> >
> >
>
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