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@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Jonathan Lewis
Sent: Wednesday, February 20, 2008 4:19 PM
To: rjoralist@xxxxxxxxxxxxxxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxxxxxxxxxxxxxx>
To: <jonathan@xxxxxxxxxxxxxxxxxx>
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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