RE: sga
Date: Fri, 12 Jun 2009 08:25:54 -0700 (PDT)
Message-ID: <254420.25998.qm_at_web32008.mail.mud.yahoo.com>
If you are going to try out cursor_sharing changes to address lack of bind variables, please try it out in a test environment and start out with cursor_sharing=similar. If this application functions anything like Oracle Financials or others that require cursor_sharing to be set to "force" it could mistakenly pass on the Oracle generated bind variables as actual values in the generated SQL and cause failures. Good luck,
Kellyn
- On Fri, 6/12/09, Zelli, Brian <Brian.Zelli_at_RoswellPark.org> wrote:
From: Zelli, Brian <Brian.Zelli_at_RoswellPark.org>
Subject: RE: sga
To: "'Andrew Kerber'" <andrew.kerber_at_gmail.com>, "Mathias Magnusson" <mathias.magnusson_at_gmail.com>
Cc: "oracle-l_at_freelists.org" <oracle-l_at_freelists.org>
Date: Friday, June 12, 2009, 7:37 AM
The form for the application does build some really crappy dynamic sql, 2 pages worth. The vendor said "oh you have to add some indexes" but that doesn't look to be the case. I seem to be leaning toward the cursor issue myself. I'll see what it is set to.
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ciao,
Brian
Brian J. Zelli, Ed.M.
Sr. Database Administrator
Enterprise Application/Systems Integration
Information Technology - Roswell Park Cancer Institute
phone: (716) 845-4460 email: brian.zelli_at_roswellpark.org
From: Andrew Kerber [mailto:andrew.kerber_at_gmail.com]
Sent: Friday, June 12, 2009 9:30 AM
To: Mathias Magnusson
Cc: Zelli, Brian; oracle-l_at_freelists.org
Subject: Re: sga
If the issue is lack of bind variables (too much dynamic sql), you can think about setting cursor_sharing=force, that solution has other problems however.
On Fri, Jun 12, 2009 at 8:26 AM, Mathias Magnusson <mathias.magnusson_at_gmail.com> wrote:
Do you know that it causes a problem? What is your key wait event that this will address and how much do you spend waiting for it? Where do you find this ratio recommendation?
Mathias
On Fri, Jun 12, 2009 at 3:04 PM, Andrew Kerber <andrew.kerber_at_gmail.com> wrote:
Well, adding memory is an option. You should also look at your code. If you are not using bind variables, that can also cause the problem, and it is almost impossible to fix that problem just by adding memory.
On Fri, Jun 12, 2009 at 8:01 AM, Zelli, Brian <Brian.Zelli_at_roswellpark.org> wrote:
Ok, so I have my sga tuned by the advisor in 10g but I have a library cache hit ratio constantly below the recommended threshold of 90%. How the heck do I tune it? Do I just increase the sga_target?
ciao,
Brian
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Received on Fri Jun 12 2009 - 10:25:54 CDT