Expected impact of under-allocation of swap

Oracle rdbms 112.0.1
Oracle GI 11.2.0.1/2
Oracle Linux 5.6 x86-64
stand-alone, no RAC
Development box is hosting ASM and 3 rdbms instances. databases are at 11.2.0.1, ASM was upgraded to 11.2.0.2 before I inherited it.
Prod box is hosting ASM and 2 rdbms instances. Databases and ASM/GI are at 11.2.0.1.
Started upgrade of GI to 11.2.0.2 and it failed the prereq check, stating there was insufficient swap. Machine has 21.5gb ram, 11.1875gb swap.
Going back installation guide for base level I see that it also recommends 16gb of swap for that amount of ram, but I don't recall seeing that in the guides that came with the upgrade. If so, I must have glossed over, thinking that since the base level was installed we should be good on any fundamental prereqs like that.
The dev box - where GI was upgraded before I started this job - has 23.5gb ram and 15.6gb swap.
On the prod boxe the ram was upgraded after the current software installtions. I believe the same happened on the dev box.
I'm waiting on a response from the SA on the feasability of upping the swap but in the mean time wondered about the expected fall-out of overriding the pre-req check and proceeding with the upgrade.

user705159 wrote:
The SWAP sizing normally asked for by oracle is a minimum for normal database operations to include installations etc. You may be able to get by with a smaller SWAP size but it depends on other factors such as system usage on the server at the indicated time. Under allocation of swap for oracle in the worst case will result in process failures due to ora-4030 errors or out of process memory. Typically you would see an accompanying swap related error in the OS logs if it were related to the swap size.yes.

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Bitmap under-allocation

I restarted my Imac today and get the same error message:
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Checking multi-linked files.
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The no-worry backup plan | Macworld
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Imac under guarantee was swapped with refurbished iMac

Hello ,
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You can download the hardware warranty here:
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Did you ever get an answer on this?
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Leveling under allocating resources

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Swap space for multiple instaces on the same box

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As noted earlier in this thread, swap space is an operating system property, and has nothing to do with software you want to run on top of it, like an oracle database.
The function of swap space is to be able cope with memory allocations beyond the amount of physical memory. In most occasions you do not want to use swap space, because it has a severe performance impact (memory blocks have to be exchanged from the swap device to physical memory).
(please mind that on some unixes (AIX and HPUX if I am not mistaking), swap is pre-allocated for processes which means the swap size is not only depended of operating system and memory size, but also the number of processes. Linux does not do that, it starts to allocate swap pages under memory pressure. There are certain issues with some memory settings in linux (linux kernel memory management is quite automatic) that can get your system to page. (memory overcommitting is one thing))
In my experience, the amount of memory which is used is depended on the amount of memory on the machine in most cases. Whilst this sound simple, think of it: with 2GB used, probably most DBA's would allocate approximately 1.5GB to the databases on that machine, if your machine got 16GB you probably want approximately 14GB to be used by the databases.
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Solaris 10 - Zones - Java Heap Allocation

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soularis wrote:
We're only asking for Xmx2048 currently and we are still being denied...I need to run in 32bit mode for my application.what are you running in 32 bits? solaris? java? or are you locked in a 32 bit zone on a 64bit server? I'm not even sure
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Better Display Driver under Windows 8 than Windows 7 for MacBook Pro Retina?

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Swap Space on Solaris 8

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swap 3.5 GB /var/run
swap 3.5 GB /tmp
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That's normal. To quote from the system administration guide:
http://docs.sun.com
�The Solaris environment uses the concept of virtual swap space, a layer between anonymous memory
pages and the physical storage (or disk-backed swap space) that actually back these pages. A
system's virtual swap space is equal to the sum of all its physical (disk-backed) swap space plus a
portion of the currently available physical memory.�
I.e. you probably have ~ 2GB memory in the machine + the 2 GB disk
based swap you've configured gives ~3.5GB virtual swap.
The two mount points /tmp and /var/run are two different filesystems
that allocate space from the same virtual swap space. They share the
swap resource, that is, if you put things in /tmp, not only the space
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I can see that the 'Photos' area seems to be all photos on your mac, like the events stream was on iPhoto before and the camera roll on IOS iPhoto.
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Photos is sorted based on the date of the photo.
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If you import 100 photos and delete 20, you will have 80 photos left from the import. The 50 you put in an album doesn't affect the total amount you added to the library. It just means that you chose not to put 30 in an an album you created. You can put the same photo in as many albums you want to create. The actual photo still resides in the library.
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How many times are permitted to swap phones in a billing cycle?

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I was told four times by one of the reps here. I haven't tried to test it.

Swap space reduced drastically

Hi Techies
We have solaies 10,oracle10g ,BI
Our production server is working fine but suddenly the swap space will reduced from 259GB to 100GB in 15 min of time span( when i checked in df -h) and then apllication will hang.
We have a work around like we will restart the application then the swap space will be released to the allocated
In this due time if i check prststat (process status) IGS process is consuming 150GB of space only.
what could be the reason for reducing the swap space drastically???
Is this the problem of application or Operating system
I have checked the note (724713)
Thank You
Haroon

Thanks for the quick reply
df -h ( detail)
Filesystem             size   used avail capacity Mounted on
swap                   258G   394M   258G     1%    /tmp
swap                   258G    56K   258G     1%    /var/run
swap                   258G     0K   258G     0%    /dev/vx/dmp
swap                   258G     0K   258G     0%    /dev/vx/rdmp
From the above the allocated size swap is reduced drastically when the issues arise.
There are 57 users connected to the server
the physical memory is 65 GB
( i also checked the note 425207 profile parameter
em/initial_size_MB =8192
ztta/roll_extension           2000683008 Byte

How to swap two primitive dataelements using swap function??

How to write a swap function that can swap two integer..??

Now we are getting somewhere. Next time you post code, use the code tags!! See Formatting Tips or just select the code and click the Code button.
you cant swap i,j using the above code...You're right. You can't do that.
so how to do that??The ints must be within some object, like I showed you
You cannot swap the values of two arguments to a method and expect the caller's variables be swapped because Java passes arguments by value not reference. There is no such thing as a pointer to a variable in Java as there is in C/C++.

Weblogic5.1 VM goes to swap on startup

I'm running Weblogic5.1 SP4 on Solaris7 64bit with the Sunsoft
JDK1.2.2-05a, I have 1Gig of memory installed, yet when I start a
weblogic VM with min heap size of 256M and a max heap size of 300M, it
immediately goes into swap space.
Memory: 1024M real, 821M free, 351M swap in use, 1506M swap free
Before starting the VM only 10M of swap is in use, and after starting
the VM as you see above, it appears that the VM hits swap immediately.
Anyone else notice this problem? How might I force the VM into physical
memory instead of swap?

Thanks for the links and pointers to utilities... I really appreciate having
learned something about investigating this further on my own.
Charlie Therit wrote:
Please make sure that you understand the complete meaning of the swap
numbers being reported. "/etc/swap -s" will show you the total amount of
swap space allocated (actually being used) and the amount reserved (pages
identified as anonymous memory that have not yet been backed by swap).
Even if you don't supply Solaris with any swapFS, the system will still
have and use swap space as Solaris swap space includes all allocated
swapFS partitions and available memory.
As long as the amount of allocated swap space (swap -s) doesn't exceed the
amount of disk space allocated for swap (swap -l), your system will have
the maximum use of its available RAM. If the amount allocated exceeds the
amount of swapFS then your system has begun locking pages in RAM and this
could lead to memory shortages. Paging should not be feared and is a
normal part of Solaris VM management. Unless the scan rate (vmstat 'sr'
column) reports higher than 300 in a 30 second period you aren't losing
performance because of memory management.
If you are interested in learning more about Solaris VM and swap
allocation, please read:
http://www.sunworld.com/swol-12-1997/swol-12-insidesolaris.html
and
http://www.sunworld.com/sunworldonline/swol-01-1998/swol-01-insidesolaris.html
Hope this helps,
Charlie
PS - If you really want to understand your JVM process, try using
/usr/proc/bin/pmap to view all segments, their sizes, and type. Also keep
in mind that each page in the JVM is backed by either anonymous memory
(swap) or the file system (UFS). Solaris reserves anonymous memory as the
process is created and allocates anonymous memory as the pages are
accessed and modified.
The views expressed in this posting are solely those of the author, and
BEA
Systems, Inc. does not endorse any of these views.
BEA Systems, Inc. is not responsible for the accuracy or completeness of
the
information provided and assumes no duty to correct, expand upon, delete
or update
any of the information contained in this posting.
Bryan O'Sullivan wrote:
w> Before starting the VM only 10M of swap is in use, and after
w> starting the VM as you see above, it appears that the VM hits swap
w> immediately.
I wouldn't come to this conclusion. The stats you are looking at tell
you how much swap is in use on the machine, not who's using it. You
should be using something else, such as ps, to see what the resident
set size of the java process is. That is the important number that
gives some indication of VM performance.
I would bet that idle processes are being swapped out on your system,
not the VM. If it turns out that those processes are not idle,
though, then you'll probably see bad performance as those processes
and the VM get into a food fight over who gets to be in physical
memory, with lots of thrashing.
<b

Expected impact of under-allocation of swap

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