RE: Rapid Log Switching

Hmm, this looks intersesting. I have:

star_transformation_enabled string FALSE

transactions                         integer
973
transactions_per_rollback_segment    integer                          5

so if threads = 98 then reserved space could be could reserve up to 12M, but that doesn't explain why I would see a lot of these switches when only ~2M have been put in the logfile, or why this has changed in the last couple weeks (before AWR went nuts last week, I was getting maybe 3 switches a day...and I know that's bad but I can't get damagement to approve smaller logs)

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Jonathan Lewis Sent: Wednesday, February 20, 2008 4:19 PM To: rjoralist_at_society.servebeer.com
Cc: oracle-l_at_freelists.org
Subject: Re: Rapid Log Switching

Rich,

Thanks - Brain didn't catch up with last post there.

John,

I recall Tanel Poder making some comments about "private threads" having space reserved in the log file - do you have a very large value for the 'transactions' parameter: which would require a lot of private threads, which possibly might pre-empt a lot of space in the logs then not use it. (10.2, 64Bit - private threads can take 128Kb each, and threads = ceil(transactions / 10)

Regards

Jonathan Lewis
http://jonathanlewis.wordpress.com

Author: Cost Based Oracle: Fundamentals
http://www.jlcomp.demon.co.uk/cbo_book/ind_book.html

The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html

• Original Message ----- From: "Rich Jesse" <rjoralist_at_society.servebeer.com> To: <jonathan_at_jlcomp.demon.co.uk> Sent: Wednesday, February 20, 2008 10:00 PM Subject: Re: Rapid Log Switching

> Hey Jonathon,
>
> I think he's saying the logs switch when they grow to only 2-to-6
Megabytes
> -- not every 2-to-6 minutes. In other words, "why aren't the logs
filling
> before switching?"
>
> Rich
>

>>
>>
>> 20M in 2 to 6 minutes isn't really very much - I assume the
>> puzzle is why have things changed.
>>

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