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тАО03-02-2010 01:04 AM
тАО03-02-2010 01:04 AM
Page out rate is high in HP-UX 11.31
Project teams are doing testing before going to production.
Having 36 GB memory and Oracle is running.
Few days before memory utilization has reached to 100 % and i have changed filecache_max to 20%.
After that memory utilization has reduced to 90 % max but Page out rate is coming in the HP Open View report.
I 'm wondering, memory is not reaching to 100% but page out rate is coming in the picture.
Can you please suggest me what are the things (parms) i have to check and changed?
Regards
GB
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тАО03-02-2010 03:51 AM
тАО03-02-2010 03:51 AM
Re: Page out rate is high in HP-UX 11.31
Are you using .dbf with filesystems or raw devices?.
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тАО03-02-2010 06:34 AM
тАО03-02-2010 06:34 AM
Re: Page out rate is high in HP-UX 11.31
If you're paging then your swapping out to disk and performance is going to drop.
As reported oracle uses its own buffer cache which is located in the SGA, so fooling around with the o/s's filecache_min and max probably isn't going to help, but I don't know what else is on your box.
Attach you kernel parm values, swapinfo -tam, sar -d, and other sar's, UNIX95=1 ps -ef -o vsz,pid,ppid,state,wchan | sort -rn | head -20
Need to see what you hit ratio on oracle cache is, should be 90 to 100%.
http://www.dbspecialists.com/files/presentations/buffercache.html
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тАО03-02-2010 06:42 AM
тАО03-02-2010 06:42 AM
Re: Page out rate is high in HP-UX 11.31
Rather than trusting OV monitors, which can falsely notify, you need to verify that you actually are paging out.
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тАО03-02-2010 06:55 AM
тАО03-02-2010 06:55 AM
Re: Page out rate is high in HP-UX 11.31
Obtain kmeminfo from HP support. Take a look at reducing the Kernel size.
Based on what you say however, I'd say Oracle memory use has increased a lot. Take a look at Oracle SGA's and see what can be cut there.
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