RE: Datafile sizes - talking about RMAN block recover now...
- From: "Robert Freeman" <robertgfreeman@xxxxxxxxx>
- To: "Christo Kutrovsky" <kutrovsky.oracle@xxxxxxxxx>
- Date: Wed, 2 May 2007 13:37:27 -0600
I'm less trusting of blockrecover than you are I think... :-) My hit ratio
with blockrecover is probably hovering around 50%. I will say that the
sample is somewhat small though! :-)
Anyone else want to share their experiences with blockrecover?
RF
Robert G. Freeman
Oracle Consultant/DBA/Author
Principal Engineer/Team Manager
The Church of Jesus Christ of Latter-Day Saints
Father of Five, Husband of One,
Author of various geeky computer titles
from Osborne/McGraw Hill (Oracle Press)
Sig V1.1
-----Original Message-----
From: Christo Kutrovsky [mailto:kutrovsky.oracle@xxxxxxxxx]
Sent: Wednesday, May 02, 2007 1:33 PM
To: robertgfreeman@xxxxxxxxx
Cc: daniel.hubler@xxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: Re: Datafile sizes
I personally use bigfiles in ASM. I dont even consider the time to
restore a hugefile, because I do not forsee the need to restore only a
chunk of a tablespace. If I am restoring the entire tablespace, it
doesn't matter how many files I have.
If I have corrupted blocks, I would use RMAN's blockrecover command.
--
Christo Kutrovsky
Senior Database/System Administrator
The Pythian Group - www.pythian.com
I blog at http://www.pythian.com/blogs/
On 5/2/07, Robert Freeman <robertgfreeman@xxxxxxxxx> wrote:
>
> Wow... that makes for a long dba_data_files query!! My personal thought on
> this is for BIG databases, I like to time how long it takes to restore a
> given datafile size. If I need to recover a given datafile, how long do I
> want that to take? My general rule is no more than 10-15 minutes
(depending
> on any SLA's of course!). So if it takes 15 minutes to restore 20GB, that
> would be my datafile size (assuming the OS can handle a datafile of that
> size and so on).
>
> I much prefer fewer, larger datafiles to more, smaller ones. Much easier
to
> manage among other things.
>
> RF
>
>
> Robert G. Freeman
> Oracle Consultant/DBA/Author
> Principle Engineer/Team Manager
> The Church of Jesus Christ of Latter-Day Saints
> Father of Five, Husband of One,
> Author of various geeky computer titles
> from Osborne/McGraw Hill (Oracle Press)
>
> -----Original Message-----
> From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On
> Behalf Of daniel.hubler@xxxxxxxxxx
> Sent: Wednesday, May 02, 2007 9:50 AM
> To: oracle-l@xxxxxxxxxxxxx
> Subject: Datafile sizes
>
>
> Looking for comments & experiences regarding sizes of datafiles.
>
> We have a large (6+ TB) OLTP database, which currently has 2300+
datafiles.
> A while ago, we stopped adding datafiles and were exclusively extending
> them.
> But we are wondering how far we can/should go, with the size of individual
> data files.
> Currently about 30% of the datafiles are at 8 gig.
>
> BTW - this particular application resides on VMS.
>
>
> Any ideas/thoughts/comments would be appreciated.
>
> Thanks.
>
>
> Dan Hubler
> Database Administrator
> Aurora Healthcare
> daniel.hubler@xxxxxxxxxx
--
Christo Kutrovsky
Senior Database/System Administrator
The Pythian Group - www.pythian.com
I blog at http://www.pythian.com/blogs/
--
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