03-06-2011
oh many reasons:
- because oracle is a filesystem + process based DB
- because each oracle forked process needs memory - I assume this server has thousands of processes
- because every batch / backup / DB load requires lots of file caching on top of what is in the SGA - each IO will use 1 page (4 k) of memory
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LEARN ABOUT DEBIAN
sg_get_page_stats
sg_get_page_stats(3) Library Functions Manual sg_get_page_stats(3)
NAME
sg_get_page_stats, sg_get_page_stats_diff - get paging statistics
SYNOPSIS
#include <statgrab.h>
sg_page_stats *sg_get_page_stats(void);
sg_page_stats *sg_get_page_stats_diff(void);
DESCRIPTION
sg_get_page_stats and sg_get_page_stats_diff both return a pointer to a static buffer of type sg_page_stats.
sg_get_page_stats will return the number of pages the system has paged in and out since bootup. sg_get_page_stats_diff will return the
difference since last time it was called. If it has not been called before, it will return sg_get_page_stats.
RETURN VALUES
typedef struct{
long long pages_pagein;
long long pages_pageout;
time_t systime;
}sg_page_stats;
pages_pagein
The number of pages swapped into memory.
pages_pageout
The number of pages swapped out of memory (to swap).
systime
The time period over which pages_pagein and pages_pageout were transferred.
BUGS
Solaris doesn't seem to report accurately. It reports the number of pages swapped into memory, not necessarily from swap. This feature
isn't deemed entirely reliable.
SEE ALSO
statgrab(3)
WEBSITE
http://www.i-scream.org/libstatgrab/
i-scream $Date: 2005/04/25 11:25:45 $ sg_get_page_stats(3)