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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Increasing Freelists?
not in 8i -- you can adjust freelists on the fly
>From: "Mohan, Ross" <MohanR_at_STARS-SMI.com>
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: RE: Increasing Freelists?
>Date: Fri, 15 Jun 2001 12:01:05 -0800
>
>The table must be dropped, yes.
>
>Default for table is 1 freelist, 2 for indexes.
>
>This is not scientific ( both because there are no
>data to support it in your post and I have no hard
>perf data of my own ) but freelists are small and
>easily/rapidly maintained. Unless you have some
>sort of "niche-y" oddball application that needs
>every drop of space in a block, you can safely bump
>yourself up to 10 freelists on your hot tables. Maybe
>just a 2x or 4x on your less incandescent ones.
>
>But, most important: for my money, LoadRunner does
>not always accurately simulate actual loads.
>
>You might be tuning yourself away from a non-existent
>problem.
>
>hth
>
>-----Original Message-----
>Sent: Friday, June 15, 2001 3:31 PM
>To: Multiple recipients of list ORACLE-L
>
>
>We've been load testing an application that will be allowing customers to
>enter their email information through the web. The loadrunner application
>was experiencing periodic freezing after which it would go back to normal.
>Reviewing the statspack information I saw a high number of buffer busy
>waits
>with the majority of the buffer waits being data block waits. This is not
>surprising, since the application is doing heavy inserts into several
>tables.
>The recommendation from an article I have is to create multiple freelists
>for the tables undergoing heavy inserts. I've never done this before and I
>have no idea of how many to create. Increase the freelists from 1 to 2?
>More? What about freelist groups?
>
>And am I correct that the table must be dropped and recreated to increase
>this parameter?
>
>I was hoping to have read Gaja's book before I had to deal with this but
>it's still in the mail :).
>
>Thanks in advance.
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: Miller, Jay
> INET: JayMiller_at_TDWaterhouse.com
>
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>Author: Mohan, Ross
> INET: MohanR_at_STARS-SMI.com
>
>Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
>San Diego, California -- Public Internet access / Mailing Lists
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-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Rachel Carmichael INET: carmichr_at_hotmail.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Fri Jun 15 2001 - 15:07:36 CDT
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