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RE: log_buffer value does not match spfile value

From: Hallas, John, Tech Dev <John.Hallas_at_gb.vodafone.co.uk>
Date: Thu, 8 Jun 2006 08:44:48 +0100
Message-ID: <1C6E45ADB2EC324F9553E468ABFE0F63034BDD95@UKWMXM04>


I have had a couple of private responses on this as well a couple to the list  

Firstly I should have typed ASMM (Automatic Shared memory Mananagment) rather than ASSM. I knew what I meant but I bet I am not the first one to make that mistake  

Secondly the CPU count is either 2,4, or 8 depending on which server I try it on. Not really sure what line is being taken on that one  

Finally I have been informed that the log_buffer shares a memory granule with the fixed SGA. That had crossed my mind but I had not been able to track any supporting evidence down.  

Thanks for the responses and the input  

John  


From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Hallas, John, Tech Dev
Sent: 07 June 2006 15:05
To: oracle-l_at_freelists.org
Subject: log_buffer value does not match spfile value    

I have a number of 10G databases where the value of log_buffer in the spfile is not the same as the value within the instance.  

Oracle is obviously deciding it's own value. This is the same on systems using ASSM and not (sga_target)  

The documentation does not seem to support this but I am sure from a number of instances that this is happening.  

Any ideas on this. Nothing much coming from Metalink. I believe that this is also happening on a databases using an init.ora file rather than an spfile  

Thanks  

John  

SQL> show parameter log_buffer  

NAME                                 TYPE        VALUE


------------------------------------ -----------
------------------------------
log_buffer integer 2097152

SQL> show parameter spfile  

NAME                                 TYPE        VALUE


------------------------------------ -----------
------------------------------
spfile string
/WELDBPROD/u01/oradata/GMSDB/s
                                                 pfileGMSDB.ora

SQL> !strings /WELDBPROD/u01/oradata/GMSDB/spfileGMSDB.ora | grep -i log_buffer

*.log_buffer=32768  

SQL> show parameter sga_target  

NAME                                 TYPE        VALUE


------------------------------------ -----------
------------------------------
sga_target big integer 512M
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Received on Thu Jun 08 2006 - 02:44:48 CDT

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