05-23-2013
For Paging Space related impacts, only the output of svmon is relevant, as -=Xray=- stated.
RSS is not related to what is being paged out and what not. ps is not useful to analyse this - stick to svmon.
Interessting are those entries, that have lots of pages being paged out and if they grow, ie. page out even more. Use of Paging Space should be avoided as it usually thrashes a system and makes it rather slow up to unusable. As Paging Space is usually being located in the rootvg on the same disks/volumes where the rest of the operating system resides, it slows down general performance since disks are way much slower than RAM.
Anyway it seems there has been allocated a bigger amount of memory for Oracle (SGA?) than you have real memory available.
That might be the reason so much pages are allocated by Oracle.
In your vmstat output you sometimes see counts in the pi and po columns which indicate that some pages are written to Paging Space or written to there, which is something you want to avoid.
High values there are usually the real problematic impact, where you and your users might "feel" the slowness of the system and it's applications on-top ie. being dependent on this Oracle DB running there.
I recommend checking your memory settings of the Oracle DB (SGA?) and adjust it so, that it uses not more than about 80% of your ~57GB RAM. Don't count the Paging Space in for that.
It could be that at day time there is not that much pi/po traffic, but it seems the space has been allocated at some time which could be as well night time.
Maybe some RMAN backups or whatever. Best is to set up some longterm monitoring with nmon for example to check out what causes this.
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LEARN ABOUT REDHAT
swapoff
SWAPON(8) Linux Programmer's Manual SWAPON(8)
NAME
swapon, swapoff - enable/disable devices and files for paging and swapping
SYNOPSIS
/sbin/swapon [-h -V]
/sbin/swapon -a [-v] [-e]
/sbin/swapon [-v] [-p priority] specialfile ...
/sbin/swapon [-s]
/sbin/swapoff [-h -V]
/sbin/swapoff -a
/sbin/swapoff specialfile ...
DESCRIPTION
Swapon is used to specify devices on which paging and swapping are to take place. Calls to swapon normally occur in the system multi-user
initialization file /etc/rc making all swap devices available, so that the paging and swapping activity is interleaved across several
devices and files.
Normally, the first form is used:
-h Provide help
-V Display version
-s Display swap usage summary by device. Equivalent to "cat /proc/swaps". Not available before Linux 2.1.25.
-a All devices marked as ``swap'' swap devices in /etc/fstab are made available. Devices that are already running as swap are silently
skipped.
-e When -a is used with swapon, -e makes swapon silently skip devices that do not exist.
-p priority
Specify priority for swapon. This option is only available if swapon was compiled under and is used under a 1.3.2 or later kernel.
priority is a value between 0 and 32767. See swapon(2) for a full description of swap priorities. Add pri=value to the option field
of /etc/fstab for use with swapon -a.
Swapoff disables swapping on the specified devices and files. When the -a flag is given, swapping is disabled on all known swap devices
and files (as found in /proc/swaps or /etc/fstab).
NOTE
You should not use swapon on a file with holes. Swap over NFS may not work.
SEE ALSO
swapon(2), swapoff(2), fstab(5), init(8), mkswap(8), rc(8), mount(8)
FILES
/dev/hd?? standard paging devices
/dev/sd?? standard (SCSI) paging devices
/etc/fstab ascii filesystem description table
HISTORY
The swapon command appeared in 4.0BSD.
Linux 1.x 25 September 1995 SWAPON(8)