RE: Check Point Interval Question

From: Hamid Alavi <hamid.alavi_at_quovadx.com>
Date: Wed, 13 Nov 2002 09:54:39 -0800
Message-ID: <F001.00502591.20021113095439@fatcity.com>

Dennis,

Here it is in the oracle performance tuning (Tip's & Techniques) page 735 suggested value for LOG_CHECKPOINT_INTERVAL = 9999999.

My oracle version is 8.1.7.4 on sun solaris, 2.8, and I have some CPU problem, My thought is may be some checkpoint problem so, I have decided to increase the size of my Redo log from 4M to 20M and change the log_checkpoint_interval from 10000 to 9999999 but I don't know what's the best setting for these numbers.

-----Original Message-----
Sent: Wednesday, November 13, 2002 9:16 AM To: Multiple recipients of list ORACLE-L

Hamid - Which parameter to use depends on your Oracle version. If it is 9i, use FAST_START_MTTR_TARGET. In 8i, use LOG_CHECKPOINT_TIMEOUT. Did your tuning manual explain why you should set it to 9999999? That seems a little strange. Basically shorter checkpoint queue lengths will shorten your recovery times, but too short a queue length may hamper performance, so it is a tradeoff. What are your tradeoff criteria?

Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Wednesday, November 13, 2002 10:39 AM To: Multiple recipients of list ORACLE-L

Hi List,

I have a question regarding check_point_interval. In my setting log_checkpoint_interval = 10000 & log_checkpoint_timeout = 1800 , I findout in the tuning manual which I have to change thelog_checkpoint_interval = 9999999 but nothing regarding the log_checkpoint_timeout, when I change the interval to 9999999 do I have to change the checkpoint_timeout too, or what's the best setting for these two numbers. I got confued, some where in the manual they are talking about to set timeout to zero some where else diffrent setting, I realy appreciate if some body give me a pratical Idea.

Thanks for your help.

Hamid Alavi
Office 818 737-0526
Cell 818 416-5095

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Author: Hamid Alavi
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Author: DENNIS WILLIAMS
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Author: Hamid Alavi
  INET: hamid.alavi_at_quovadx.com

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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 Wed Nov 13 2002 - 11:54:39 CST