[rrd-users] Fetch a particular data source with rrdtool

[Landon Stewart]

Hi Sanjit,

I am successfully using the perl module RRDTool::OO for this purpose.
 Something like the following would print values between the two time stamps
given on the command line as parameters:

#!/usr/bin/perl
use RRDTool::OO;
$rrd = RRDTool::OO->new( file => "rrdfile.rrd" );
$rrd->fetch_start(
        start => @ARGV[0],
        end   => @ARGV[1],
        resolution => "300",
        cfunc => "MAX"
        );
$rrd->fetch_skip_undef();
while(my($time, @value) = $rrd->fetch_next()) {
  print "$time:",sprintf("%.2f", $value[0]),"\n" if $value[0];
  print "$time:",sprintf("%.2f", $value[1]),"\n" if $value[1];
}

On Wed, Jul 7, 2010 at 8:44 PM, Sanjit Jhala <sjhalaz at gmail.com> wrote:

> I want to fetch the data for some specific statistics in the RRD and graph
> them with my own graphing tool instead of rrdgraph. Is it possible to fetch
> a particular statistic stored in the rrdtool database using something like
> rrdfetch?
>
> As I understand it rrdfetch fetches values for all the variables stored in
> RRD. Looking at rrdgraph it allows me to graph a specific stat without
> having to fetch values for all the stats. Is it possible to fetch just one
> or a specific set of statistics that I am interested in instead of all of
> them?
>
> -Sanjit
>
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>
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