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тАО09-24-2008 11:55 PM
тАО09-24-2008 11:55 PM
sar -b is reporting 100% read cache hits and 94% write cache hits.
Should I be looking at changing any of the HP-UX kernel parameters or swap? The DBA is initially planning to double the SGA to 3Gb. Any pointers will be gratefully received.
Solved! Go to Solution.
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тАО09-25-2008 12:03 AM
тАО09-25-2008 12:03 AM
Re: Memory Upgrade - kernel parms and swap
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тАО09-25-2008 12:16 AM
тАО09-25-2008 12:16 AM
Re: Memory Upgrade - kernel parms and swap
As your memory will be increased and these parameters take the percent, you can decrease parameters so that it will consume as much as space before you did the memory upgrade.
and as you'll fix memory problem, you can turn the swapmem_on to 1.
Kenan.
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тАО09-25-2008 12:23 AM
тАО09-25-2008 12:23 AM
Re: Memory Upgrade - kernel parms and swap
- Set swapmem_on to 1. This will help in utilising the available space properly.
- After you change the SGA memory, you need observe the cache hit rates and update the dbc_max_pct, if required.
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тАО09-25-2008 12:28 AM
тАО09-25-2008 12:28 AM
Re: Memory Upgrade - kernel parms and swap
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тАО09-25-2008 12:37 AM
тАО09-25-2008 12:37 AM
Re: Memory Upgrade - kernel parms and swap
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тАО09-25-2008 12:39 AM
тАО09-25-2008 12:39 AM
SolutionI would advise the following:
1) Figure out where you would locate additional swap space, but don't configure it immediately. Doubling memory should negate the paging that is going on. swapinfo -tam output would be nice to see.
2) Do not let the DBA change the SGA immediately. Wait for Oracle to do some self adjustment and monitor performance and judge the impact of memory increase prior to increasing the SGA. You may find your performance issues were due to swapping and immediately consuming additional memory for more SGA is not the best use of memory.
3) Check your system for memory leaks.
http://www.hpux.ws/?p=8
4) Monitor performance before and after the upgrade with a more comprehensive tool set.
http://www.hpux.ws/?p=6
swapmem_on=1 issue.
http://unix.derkeiler.com/Mailing-Lists/HP-UX-Admin/2004-01/0057.html
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=29191
swapmem obsolete????
http://docs.hp.com/en/B2355-60130/swapmem_on.5.html
Oracle performance tuning on HP-UX
http://docs.hp.com/cgi-bin/doc3k/BB316290001.14257/25
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