ORACLE Database running slow on AIX ( nmon / topas ) Post: 302444245

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Operating Systems AIX ORACLE Database running slow on AIX ( nmon / topas ) Post 302444245 by zaxxon on Wednesday 11th of August 2010 09:31:33 AM

08-11-2010

Registered User

Not sure what the query is. It can be a complicated or a trivial one. There are several kind of memory types Oracle is using, iiirc, and the biggest is or was the SGA (I am not up to date). Not sure if all those several types that might be configured for that instance can be satisfied with your 4 GB, not to forget that the OS needs some RAM too. Also it is a question on what disks your DB is placed. Slow internal SCSI disks or maybe fast and cached SAN disks.

I remember from DB2 a tool called db2expln with that you could easily check out if a query uses indexes, etc. or does slow table scans etc. I bet there is something similar for Oracle, ie. some kind of SQL analyzer. Maybe it is a missing Index etc...

If you do not mind please let the vmstat -w run while the query is running and post it here using code tags.

What might be also interessting could be following output:

Code:

lsdev -C -l aio0

If there is several problems, it always often a solution to turn on Concurrent I/O (mount option "cio" and in Oracle filesystemio_options=setall) for the data, redo and log filesystems only.
But maybe get the info up there 1st - maybe you find something suspicous.

zaxxon

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LEARN ABOUT MINIX

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)