ORACLE Database running slow on AIX ( nmon / topas ) Post: 302470812

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Operating Systems AIX ORACLE Database running slow on AIX ( nmon / topas ) Post 302470812 by ctsgnb on Thursday 11th of November 2010 07:07:16 AM

11-11-2010

Registered User

First of all, you should lower your SGA i would set it to 20Gb for a beginning and put it in memory with lock_sga = true
You should lower the db_cache_size as well (must be contained in sga), 32G is too big regarding to the current activity which show around 620M to be currently sufficient ....
so setting a db_cache_size to 2Gb would already be quite generous

it was lock_sga, not log_sga (that was a typo error that i have corrected)

You should consider setting lock_sga to true instead of the current value false, but make sur you fit the oracle recommendation (see the previous pdf and metalink reference previously posted)

I did a typo error : in the view name of the PGA : it is v$pgastat instead of v$pgastats (no trailing "s")

Code:

select * from v$pgastat;

By the way , you might consider setting your lock_sga to true instead of false since it seems you have enough physical memory to hold your SGA into it (this will force the SGA in RAM and not in swap). But do it carefully (if all the RAM is used by the SGA, there will be less RAM for PGA ...) and make sure you follow the oracle recommendations in the pdf link mentionned in my previous post.

Maybe you should generate an html report on your server using the standard report, @$ORACLE_HOME/rdbms/admin/awrrpt.sql
and selecting 2 snaps containing a timeframe in which you encountered performance problem.(The timeframe should not contain downtime, otherwise the reported stat are not relevant) so you could then have a look at it (have a look at heavy sql statements for example).

Does your server run a single oracle instance or more ?

Check how much RAM is used purely by your operating system.

Do you have some other application or ERP running on that server (SAP ? OAP ? other ?) or is it a pure oracle server?

Last edited by ctsgnb; 11-11-2010 at 09:55 PM..

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LEARN ABOUT LINUX

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)