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Fwd: Antw: Re: Multiple DBs vs Multiple instances

Posted By:
Date:

On not being able to restore a single database if multiple databases reside in a
single instance... This is ALMOST true. If you are a careful and fastidious
DBA and keep all of a single database segregated into its own dbspace(s) then
you CAN restore just that one or few dbspace(s) effectively restoring a single
database.

Art S. Kagel

----- Original Message -----
From: Andreas.Kut.... <Andreas.KUTSCHE@spar.at>
At: 3/14 5:20

----LNX_Fri_Mar_14_2003_09:11:38_V3.33--
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

>Datum: 2003.03.13 22:33:08
>Sender: Zev Berezin <zevb@bhphotovideo.com>
>
> Archive/Restore would be an issue.
>Using multiple instances, would be a good method to archive a
>single DB. On the other hand It would be cumbersome if you must
>archive all the Production instances for Disaster recovery.
>
=

I agree with that. If you have one instance you can't restore a single
database (unless you take your backups with dbexport locking the database=
s).
You might be forced to restore the entire instance to another server
and extract the needed older version of one database.
That's certainly an issue.
=

On the other side you can provide more ressources (tmp dbspace, logicol
logs space, locks, cpu vps etc.) with one big instance. In most situation=
s
not all applications have their peak loads at the same time.
But if an application breaks all barriers (lock table overflow, exclusive=

long transaction) all databases will suffer.
=

I don't advise to prefer one approach over the other. Some differences
are a matter of personal preferences.
=

Regards,
Andreas Kutsche
=

>HTH,
>Zev Berezin
>B&H Photo
>>
>>On 13 Mar 2003, at 12:57, Terrence Mu.... wrote:
>>
>> What are the pros/cons of have multiple databases in one instance as
>> opposed to having multiple instances with just one database.

------------------------------------------------
SPAR Oesterreichische Warenhandels-AG
Hauptzentrale
Europastra=DFe 3
A-5015 Salzburg
=

Telefon : +43 662 4470 24423
E-Mail : Andreas.KUTSCHE@spar.at
Internet: http://www.spar.at
------------------------------------------------

=

----LNX_Fri_Mar_14_2003_09:11:38_V3.33----

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