RE: How much time can save using _disable_logging on 10g

>>Can you tell me please how much time you saved

I had to dig through my notes...I don't have a memory for this stuff ...that's why I take notes.

This is from my own email to my co-workers;

>> I was able to load theses TABLEs in about 24 to 32 minutes.
>> Below are my EXPort and IMPort parameters.
>> Also, I tried using the Oracle parameter; "_disable_logging = TRUE"
>> ...it seemed to have a 15% - 25% time improvement...18 minutes.

hth

Chris Marquez
Oracle DBA

-----Original Message-----
From: Juan Carlos Reyes Pacheco [mailto:juancarlosreyesp_at_gmail.com] Sent: Tuesday, October 11, 2005 12:07 PM To: Marquez, Chris
Cc: mcdonald.connor_at_gmail.com; oracle-l_at_freelists.org Subject: Re: How much time can save using _disable_logging on 10g

Thanks Chris, I agree with you, a simple shutdown immediate crashed my test database too, but anyway is interesting to know its limitations.

Can you tell me please how much time you saved :) only for statistics. when migrating.

Thanks in Advance.

On 10/11/05, Marquez, Chris <cmarquez_at_collegeboard.org> wrote:
>
>
>
> >>shutdown abort with _disable_logging and you'll see some interesting
> consequences
>
> Ahhhh yes we conversed on this topic a while back. I used
_disable_logging
> for migration purposes after a lot of TEST my process.
> I kept wondering why my test db was crashing hard...we had some disk
> issue at the time, so that seemed the culprit.
> Turns out I kept leaving my TEST db up with _disable_logging enabled
> during server reboots...it did not come back happily
>
> A great and very, very challenging recovery filled with undocumented
> parameters that rendered my TEST database un-supported.
> I was able to recover sometimes, but others not.
> Think I was "bumping scn's" and allowing reset log corruption.
> You have not lived until you have recovered a database this
way...nasty!
> :o)
> Also, learned and documented the "clean way" to stop using
> _disable_logging and put my db back in archive log mode.
>
>
> Sorry, "yes" _disable_logging saved time during my migration (at the
> risk of loosing it all on the *new* server, but not on the old
server).
>
> Chris Marquez
> Oracle DBA
>
> ________________________________
> From: oracle-l-bounce_at_freelists.org
> [mailto:oracle-l-bounce_at_freelists.org]
> On Behalf Of Connor McDonald
> Sent: Monday, October 10, 2005 11:08 AM
> To: oracle-l_at_freelists.org
> Subject: Re: How much time can save using _disable_logging on 10g
>
>
> shutdown immediate is still a clean shutdown.
>
> Try shutdown abort with _disable_logging and you'll see some
> interesting consequences
>
> hth
> connor
>
>
>
> --
> Connor McDonald
> ===========================
> email: connor_mcdonald_at_yahoo.com
> web: http://www.oracledba.co.uk
>
> "Semper in excremento, sole profundum qui variat"

--
Oracle Certified Profesional 9i 10g
Orace Certified Professional Developer 6i

8 years of experience in Oracle 7,8i,9i,10g and developer 6i
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