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тАО01-20-2009 09:23 AM
тАО01-20-2009 09:23 AM
The server has 8Gb of physical memory.
I have attached the output of "vmstat" with my comments in the attached file.
I would really appreciate if anyone can explain the output of vmstat at each stage when the database was shutdown, the server was rebooted but no database was started and finally when the database was started.
Solved! Go to Solution.
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тАО01-20-2009 09:25 AM
тАО01-20-2009 09:25 AM
Re: Memory usage on Tru64 Unix V5.1B
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тАО01-20-2009 11:33 AM
тАО01-20-2009 11:33 AM
SolutionCould you put some context around your question please... Is there a particular problem you are trying to solve, or do you just want to know what vmstat is showing you ?
If the latter then "man vmstat" would be a good start !
Cheers,
Rob
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тАО01-20-2009 12:01 PM
тАО01-20-2009 12:01 PM
Re: Memory usage on Tru64 Unix V5.1B
What fields in vmstat are relevant if my server is having memory problems? The second attached file of vmstat output is the one to look at.
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тАО01-20-2009 12:40 PM
тАО01-20-2009 12:40 PM
Re: Memory usage on Tru64 Unix V5.1B
It's not 347KB of free memory...
It's 347536 pages of free memory, where each page is 8192 bytes.
By my calculation that's about 2.6GB of free memory.
Cheers,
Rob
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тАО01-20-2009 08:25 PM
тАО01-20-2009 08:25 PM
Re: Memory usage on Tru64 Unix V5.1B
If there is a memory problem, then it is that not enough was given to Oracle and it is just sitting there going to waste instead of being used.
In the first picture, with 'only' 2.5 GB free, the bulk of the rest (580011 pages = 4GB ) was used by UBC, and potentially reall also was free in the it could be reclaimed as needed...
Next a reboot. Nothing has has been put in the UBC just yet, so now 4GB + 2.5G + more = 7+ GB is free.
Finally Oracle is activated and 171291 pages become active (was 7133). That is just 1.4GB or less than 1/5 of the box. A drop in the bucket. Still 3/4 of memory is free for example for Oracle slave tasks as connections are being made (could be from 5 - 20 mb/connection).
So what is the _real_ problem you are trying to address? Only a lack of understanding or a (performance?) user complaint?
hth,
Hein van den Heuvel
HvdH Performance Consulting.
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тАО01-26-2009 04:57 AM
тАО01-26-2009 04:57 AM
Re: Memory usage on Tru64 Unix V5.1B
It was my lack of understanding of vmstat. I am gratful to you to explain what these values mean in vmstat. I was being asked by our DBA why was there still 2Gb of free pages showing even when the Oracle database was shutdown?