RE: ASMM
- From: "Zelli, Brian" <Brian.Zelli@xxxxxxxxxxxxxxx>
- To: Chris Taylor <christopherdtaylor1994@xxxxxxxxx>
- Date: Mon, 12 May 2014 15:09:42 +0000
Fixed SGA Size 2.07003021
Redo Buffers 6.41796875
Buffer Cache Size 592
Shared Pool Size 464
Large Pool Size 16
Java Pool Size 16
Streams Pool Size 0
Shared IO Pool Size 0
Granule Size 16
Maximum SGA Size 1672.48828
Startup overhead in Shared Pool 192
NAME SIZE_MB
-------------------------------- ----------
Free SGA Memory Available 576
Is the results of the query. It is a mix and there are a lot of SQL with
literals.
Brian
From: Chris Taylor [mailto:christopherdtaylor1994@xxxxxxxxx]
Sent: Monday, May 12, 2014 10:56 AM
To: Zelli, Brian
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: ASMM
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@xxxxxxxxxxxxxxx<mailto:Brian.Zelli@xxxxxxxxxxxxxxx>> 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…..
Brian
From: Chris Taylor
[mailto:christopherdtaylor1994@xxxxxxxxx<mailto:christopherdtaylor1994@xxxxxxxxx>]
Sent: Monday, May 12, 2014 10:38 AM
To: Zelli, Brian
Cc: oracle-l (oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>)
Subject: Re: ASMM
Brian,
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.
Regards,
Chris
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