Re: [rrd-users] Strange fetch behaviour (even stranger in the

On Mon, Feb 04, 2008 at 08:51:40PM +0200, Dimitris Karteris wrote:
> Hi to all,
>
> I'm having some problems with fetch. It just doesn't seem to get things
> right as far as "start" and "end" arguments are concerned. I'm kinda
> newbie in rrdtool so I hope I'm not missing something here. Anyway, here
> goes: I'm trying to fetch some values from an rrd file with step set to
> 1. Here's what I get for the 1201849690 to 1201849693 time series:

I can explain half of it. The other half is for somebody else.

> $ rrdtool fetch lights_corridor.rrd LAST \
> -s 1201849690 -e 1201849693

You ask here for an interval starting at 1201849690, ...

> main
>
> 1201849691: 0.0000000000e+00
> 1201849692: 0.0000000000e+00
> 1201849693: 0.0000000000e+00
> 1201849694: 0.0000000000e+00

.... and aparently you are using step size 1 in your database. Each
interval in your database is one second large, the entry marked
1201849691 is actually starting at 1201849690 !

That does not explain why you got to see 1201849693..1201849694, and
I cannot explain either.

--
Alex van den Bogaerdt
http://www.vandenbogaerdt.nl/rrdtool/

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