Oracle use full physical memory

hi,
I have Oracle 10g on RHEL5, and I examine server with free -m command.
[root@prod ~]# free -m
total used free shared buffers cached
Mem: 3619 3599 19 0 242 2548
-/+ buffers/cache: 809 2809
Swap: 6142 132 6009
from this report i see that free memory 4gb, but free 19mb.
then i run "top -b -d 4 -n 1 -u oracle" this command
top - 12:25:09 up 103 days, 1:38, 3 users, load average: 0.07, 0.04, 0.00
Tasks: 280 total, 1 running, 279 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.6%id, 0.2%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3705856k total, 3689336k used, 16520k free, 250644k buffers
Swap: 6289436k total, 135288k used, 6154148k free, 2609836k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
28330 oracle 15 0 1687m 507m 502m S 0.0 14.0 2:47.47 oracle
This process is SMON
Why SMON proccess use 14% memory? can anyone advice in this situation?
what can I do?

Please use the code tag with square brackets to format output/code nicely e.g.
top - 11:56:58 up 35 days, 18:51, 4 users, load average: 1.00, 1.03, 0.80
Tasks: 218 total,   2 running, 216 sleeping,   0 stopped,   0 zombie
Cpu(s): 3.6% us, 1.0% sy, 0.0% ni, 87.1% id, 8.2% wa, 0.0% hi, 0.2% si
Mem:   4041380k total, 3981164k used,    60216k free,    21124k buffers
Swap: 8385880k total,   439088k used, 7946792k free, 3193296k cached
PID USER      PR NI VIRT RES SHR S %CPU %MEM    TIME+ COMMAND
8886 oracle    25   0 1931m 721m 707m R 98.8 18.3 17:21.79 oracle
    1 root      16   0 4772 436 404 S 0.0 0.0   2:36.11 initWhat is sga_max_size and sga_target size set to?
Above are few lines of top from my DEV db box, which has 4GB memory.
I have two db on that box SGA target set to 1GB each and SGA max 1.75GB, so max db usage should be 3.5GB.
Yet it shows memory usage is nearly 100%, that is fine, because Linux uses free memory for caching.
Long are swap is heavily not being used, and memory is 100% that is fine. Just because OS is showing 100% does not not mean DB has taken all of that memory.
Hope I did not confuse you further.
Regards,
Edited by: sape007 on Jul 14, 2010 1:08 PM
Changed from 1.5 to 1.75GB

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user12017889 wrote:
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> We have a Windows NT system with 2 Gb of physical memory and would
> like to utilize the RAM fully using Labview. What usually occurs is
> that Labview uses a tremendous amount of page file space while a
> majority of the physical memory is unused. Is there a way to
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SAP R/3 Version: SAP 4.6C
Oracle Version: 10.2.0.4.0
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======================================================================
kernel release               46D
kernel make variant       46D_EXT
compiled on                  AIX 1 5 0056AA8A4C00
compiled for                  64 BIT
compile time                  Aug 17 2007 10:57:49
update level                  0
patch number                  2337
source id                     0.2337
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System Model: IBM,9117-MMA
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CUA buffer
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Screen buffer
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Generic key table buffer
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Single record table buffer
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Export/import buffer
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Table definition buffer
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Field description buffer
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Initial record buffer
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Short nametab (NTAB)
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Calendar buffer
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Because without virtual memory, managing computer RAM is a royal pain in the ...
Virtual memory cost you nothing, and gains you huge benefits, even if you do not notice it
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How to make use of the spare physical memory under buffered I/O of Essbase

We encountered an issue of the physical memory allocation of the server running Essbase with buffered I/O mode. We have implemented some cache setting in Essbase but still found that the disk I/O is quite high. Also we observed that Windows 2003 server cannot make use of the spare physical memory available as the system cache for database files of Essbase.
As allocating more memory as Essbase cache might not help, we would like to know other than changing to direct I/O mode, any other options can improve the disk I/O performance?
Thanks!

Sandeep Reddy wrote:
Hi Hyperion_User,
1. Disk IO performance,It mighe depend on quite a few things , one of the aspects might be your storage system. It can depend on the disk configuration too ( i.e if your disk is SAN or NAS, then it depends on the configuration like Raid ..etc).
2. It depends on the HBA ( host bus adapter).
3. Let me try to explain with diagram.
http://www.c-sharpcorner.com/uploadfile/freebookarticles/apress/2008dec16010208am/DataStorageDesign/Images/159059214X-1404.1.gif
4. It might depend on the HBA and even on the switch speed.
5. Buffered IO is a very generic setting,which most of them use( that should not be an issue).
6. Even if you have 30 to 40 GB free memory, every application in essbase has a limitation to it maximum usage ( 2 GB on windows ). Refer to DBAG for more information on this .
Sandeep Reddy Enti
HCC
http://hyperionconsultancy.com/
Thanks for your detailed advice. I just wonder if more physical memory can help to improve the disk I/O being used for concurrent read/write access. We are using Windows 2003 Enterprise Edition and not sure whether some spare physical memory can be used for this purpose.
Thanks again!

How to get the size of physical memory by using system call ?

how to get the size of physical memory by using system call ?What system call can be used for me to get the size of physical memor? thanks.

%vmstat 3
procs memory page disk faults cpu
r b w swap free re mf pi po fr de sr s0 -- -- -- in sy cs us sy id
0 0 0 3025816 994456 4 19 6 0 0 0 0 8 0 0 0 459 253 139 1 1 99
0 0 0 2864688 777408 0 2 0 0 0 0 0 3 0 0 0 428 134 175 0 1 99
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the first line of information always off chart, so I usually do a few interval to get constant result.
if you use linux
just
cat /proc/meminfo

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Can oracle use more memory than pga+sga

Hi Experts,
If I have set pga 1GB and SGA 2GB then Could oracle use more than 3GB RAM from OS.
Thanks,
Please Ignore if seems to be very basic question..

Yes.
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Hi everybody,
I am dealing with a project related to micro-EDM. We feed the gap voltage back to a NI DAQ card (not quite sure about the series number, might not be important to this problem), and we want to use this voltage to determine the command position of the motor, which is controlled by a Delta Tau PMAC motion controller. Now the problem is, the NI DAQ card and Delta Tau PMAC controller cannot communicate directly with each other. Therefore, we want the LabVIEW to write the value of voltage to a certain physical memory address, and then let the PMAC controller read that address. Is this feasible by using LabVIEW and NI-DAQ card? Which block or library in LabVIEW shall I use to achieve that? Or is there any alternative way to do it? Thanks a million!
I have to get this done by the end of this week....if you know how to do it, please let me know. I really appreciate it! You are my lifesavor!
Regards,
Xiaofei

Duplicate post: http://forums.ni.com/ni/board/message?board.id=170&thread.id=289539&jump=true
LabVIEW Champion . Do more with less code and in less time .

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