Re: ASMM
Date: Mon, 12 May 2014 09:55:46 -0500
Message-ID: <CAP79kiQzrUNZA0gfjJ+5VU2CDWzXj=WdrKHbESLnCHRW9=QYuQ_at_mail.gmail.com>
First I would caution you on the use of trying to hit some "magical" ratio - there are lots of discussions on this topic both on this list and around the web (AskTom, Hotsos, Cary Millsap etc) Here's a link to a 2003 article at Hotsos:
http://www.hotsos.com/e-library/abstract.php?id=6
Now, having said that, what _are_ your pool sizes currently?
select name,bytes/1024/1024 as size_mb
from v$sgainfo
/
Next, what is your application profile "look like"? What I mean by that is, for the applications that use your database, what does the app do inside the database? Is it a lot of straight SQL? A lot of PL/SQL? A mix? Does the SQL and PL/SQL use bind variables appropriately, or do you have lots of SQL with literal values that are considered "unique"?
If you have a lot of SQL that cannot be shared, this is going to drive down that ratio you're looking at. Also if you have anything that is flooding the library cache and invalidating previous SQL that will also drive down your ration I believe. And there are others as well.
Regards,
Chris
On Mon, May 12, 2014 at 9:41 AM, Zelli, Brian <Brian.Zelli_at_roswellpark.org>wrote:
> I am finding that my Library Cache Get hit Ratio % is hovering around
> 50-60 percent. I read that the value should be above 90%. I read that
> the recommendation is to increase the shared pool size. I am running AMM
> and I set the memory_target twice what it was and still no relief…..
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> Brian
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> *From:* Chris Taylor [mailto:christopherdtaylor1994_at_gmail.com]
> *Sent:* Monday, May 12, 2014 10:38 AM
> *To:* Zelli, Brian
> *Cc:* oracle-l (oracle-l_at_freelists.org)
> *Subject:* Re: ASMM
>
>
>
> Brian,
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> The answer to your question is "it depends". What are you running now?
> (AMM I assume?) What is your goal? Are you trying to solve a problem you
> think is related to AMM or a non-AMM configuration? There's not a black
> and white answer to your question. With some more details people "might"
> be able to offer some insight/suggestions.
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> Regards,
>
> Chris
>
>
>
-- http://www.freelists.org/webpage/oracle-lReceived on Mon May 12 2014 - 16:55:46 CEST