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

[Sanjit Jhala]

Actually looking at this more, I think your code fetches all the values
between the give time range. I am only interested in fetching the values of
a couple of variables, not all. Is there a way to do that? (prefereable via
Ruby/Python bindings or rrdtool command line interface).

-Sanjit

On Wed, Jul 7, 2010 at 11:51 PM, Landon Stewart <lstewart at superb.net> wrote:

> 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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