[rrd-users] How do I view contents of an rrd database?
betamaz at gmail.com
Fri May 18 21:39:21 CEST 2007
Simon, thank you for your previous response. Related to my previous posting,
I have the following questions:
How do I output the values stored in an rrd database?
Also, does rrdtool have an option for viewing all the rrd databases --
similar to that of mysql's "SHOW DATABASES" command? And is it possible to
delete an existing rrd database?
Also, does the rrd-users archive have a search option? so far, I've tried
googling with mixed results.
On 5/16/07, Simon Hobson <linux at thehobsons.co.uk> wrote:
> betamaz wrote:
> >I'm new to rrdtool and have been reading up on the tutorial posted
> >on the main webpage. The examples in the tutorial describe how to
> >create a database by taking measurements. For example, using snmp or
> >it gives basic examples where the inputs are via the rrdtool create
> >command line (for example the speed inputs for test.rrd). Is there a
> >way, to read inputs from command line and create a database out of
> >that (similar to gnuplot)?
> Yes, RRD doesn't care where the data comes from, all it sees are a
> series of update with timestamp and a number of values. As long as
> the timestamps a) make sense for the data, and b) are always
> increasing, then rrd will handle it.
> So assuming you have a file containing a series of records, one per
> line, of the form time:value then you simply need to write a script
> of the form :
> create rrd file
> while (read timestamp:value pair)
> update rrd with timestamp and value
> create graph
> With the exception of drawing a graph which normally takes a few
> lines of arguments, the above can be written in about the same number
> of statements in most languages (whether that be Bash shell script,
> Perl, ...). How much extra checking etc you put in is up to you and
> what you know about the source of the data - such as is the file
> format likely to be correct (ie it's created by a trustworthy
> automated tool) or do you need to do extensive validation on the
> input ?
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