ORACLE Database running slow on AIX ( nmon / topas ) Post: 302447132

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Operating Systems AIX ORACLE Database running slow on AIX ( nmon / topas ) Post 302447132 by filosophizer on Saturday 21st of August 2010 04:04:09 PM

08-21-2010

Registered User

Thanks for the reply ; zxmaus, what does vmstat -I 2 20 tell us

vmstat -I 2 20

Code:

# vmstat -I 2  2
System Configuration: lcpu=2 mem=4096MB
   kthr       memory              page               faults        cpu
-------- -----------  ------------------------ ------------ -----------
 r  b   p   avm   fre  fi  fo  pi  po   fr  sr   in   sy  cs us sy id wa
 1   2  0 802714  5120 394  34   7   8 409   101 448 3455 1338 10  3 82  5
 1  1  0 802802   4944  43   8   1   0    0    0 527 4472 1339 11  3 80  7
#

---------- Post updated at 12:04 PM ---------- Previous update was at 02:45 AM ----------

It is very confusing to decode / translate VMSTAT output. Searching on Google for VMSTAT translation I came across this link
http://www.skywayradio.com/tech/linux/vmstat.html
http://www.ibmsystemsmag.com/aix/februarymarch04/features/6670p1.aspx
http://www.tek-tips.com/viewthread.cfm?qid=1186922&page=1
http://www.aixexpert.com/wiki/index.php/AIX_Expert

From the AIX 5.1 "man" pages, the vmstat command reports statistics about kernel threads, virtual memory, disks, traps and CPU activity. These system-wide (among all processors) statistics are calculated as averages for values expressed as percentages and as sums otherwise. If the vmstat command is invoked without flags, the report contains a summary of activity since system startup. The interval parameter specifies the amount of time between each report in seconds. The first report contains statistics for the time since startup. Subsequent reports contain statistics collected during the interval since the previous report.

but now, I am more confused, can someone help me from the above output for vmstat -I 2 20 ; what does it show ?

How can I make sure that I need more memory or Need more processing power ? because someone told me, that ORACLE when it starts takes up all the available memory, so even if I have 100GB memory, it will always show little memory remaining. is this true ?

filosophizer

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LEARN ABOUT REDHAT

vmstat

VMSTAT(8)						   Linux Administrator's Manual 						 VMSTAT(8)

NAME

       vmstat - Report virtual memory statistics

SYNOPSIS

       vmstat [-n] [delay [ count]]
       vmstat[-V]

DESCRIPTION

       vmstat reports information about processes, memory, paging, block IO, traps, and cpu activity.

       The  first report produced gives averages since the last reboot.  Additional reports give information on a sampling period of length delay.
       The process and memory reports are instantaneous in either case.

   Options
       The -n switch  causes the header to be displayed only once rather than periodically.

       delay is the delay between updates in seconds.  If no delay is specified, only one report is printed with the average values since boot.

       count is the number of updates.	If no count is specified and delay is defined, count defaults to infinity.

       The -V switch results in displaying version information.

FIELD DESCRIPTIONS

   Procs
       r: The number of processes waiting for run time.
       b: The number of processes in uninterruptable sleep.
       w: The number of processes swapped out but otherwise runnable.  This
	  field is calculated, but Linux never desperation swaps.

   Memory
       swpd: the amount of virtual memory used (kB).
       free: the amount of idle memory (kB).
       buff: the amount of memory used as buffers (kB).

   Swap
       si: Amount of memory swapped in from disk (kB/s).
       so: Amount of memory swapped to disk (kB/s).

   IO
       bi: Blocks sent to a block device (blocks/s).
       bo: Blocks received from a block device (blocks/s).

   System
       in: The number of interrupts per second, including the clock.
       cs: The number of context switches per second.

   CPU
       These are percentages of total CPU time.
       us: user time
       sy: system time
       id: idle time

NOTES

       vmstat does not require special permissions.

       These reports are intended to help identify system bottlenecks.	Linux vmstat does not count itself as a running process.

       All linux blocks are currently 1k, except for CD-ROM blocks which are 2k.

FILES

       /proc/meminfo
       /proc/stat
       /proc/*/stat

SEE ALSO

       ps(1), top(1), free(1)

BUGS

       Does not tabulate the block io per device or count the number of system calls.

AUTHOR

       Written by Henry Ware <al172@yfn.ysu.edu>.

Throatwobbler Ginkgo Labs					   27 July 1994 							 VMSTAT(8)