01-17-2017
Quote:
Originally Posted by
powerAIX
T
I have already raise request to increase the SGA to 80Gb as memory is of 200Gb.
OK, but prepare to either shrink the LPARs memory or increase the SGA further to about 90% of the available RAM.
The most imminent thing to do, though, is to set the "FILESYSTEMIO_OPTIONS=SETALL" option or to mount the filesystems accordingly. I suggest doing it in the DB configuration: without this you will always have the OS trying to (double-) buffer the DB I/O, which will always be detrimental to performance.
Mounting an FS in CIO-mode (concurrent-I/O) will make all the I/O on that FS be via concurrent I/O, which is a good idea for DB files opened by the DB but a bad idea otherwise. You would need to create separate FSes (not to be mounted with the CIO-option) for i.e. dumps, exports, etc.. Setting the option in the Oracle-config will make the database open the individual files with the CIO-option but the FS itself is not changed. Thiw will have the same effect as above but without the need to create separated FSes.
I hope this helps.
bakunin
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FREE(1) Linux User's Manual FREE(1)
NAME
free - Display amount of free and used memory in the system
SYNOPSIS
free [-b|-k|-m|-g] [-c count] [-l] [-o] [-t] [-s delay] [-V]
DESCRIPTION
free displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel. The
shared memory column should be ignored; it is obsolete.
OPTIONS
-b Display the amount of memory in bytes.
-c count
Display the result count times. Requires the -s option.
-g Display the amount of memory in gigabytes.
-k Display the amount of memory in kilobytes. This is the default.
-l Show detailed low and high memory statistics.
-m Display the amount of memory in megabytes.
-o Display the output in old format, the only difference being this option will disable the display of the "buffer adjusted" line.
-s Continuously display the result delay seconds apart. You may actually specify any floating point number for delay, usleep(3) is used
for microsecond resolution delay times.
-t Display a line showing the column totals.
-V Display version information.
FILES
/proc/meminfo memory information
AUTHORS
Written by Brian Edmonds.
Send bug reports to <albert@users.sf.net>
SEE ALSO
ps(1), slabtop(1), top(1), vmstat(8).
Cohesive Systems 5 Oct 2009 FREE(1)