[rrd-users] Re: Bulk updating rrd - how???

[Alex van den Bogaerdt]

On Fri, Sep 13, 2002 at 08:49:45AM +0200, John Goor wrote:

> The next problems and questions arise:
> - when i fetch the database, 295 lines show up.
> I expect 10 lines however (for 10 samples are specified in the RRA)

It does not matter how many rows there are in the database.  If you
ask for a specific range, you will get a specific range.  It is possible
that many rows aren't known --> NaN.  You ask for time "t" and RRDtool
tells you "I don't know".

> - I want the db to start at the time specified, 1022925300 because the data
> I enter starts at 1022925600.
> When I use RRDs::fetch (the script from the tutorial),1031863200 shows up
> as the last date and 1031776500 as the first.

*You* specify the start and end times.  If you don't do so on the
command line, you implicitly ask for "--start end-24h" "--end now".

RRDtool returns one row more than requested.  This can be seen as
a feature or as a bug; let's not go into that discussion.  If you
do 1031863200-1031776500 you get 86700 (24h + 300s).

> There should be a way to bulk-update isn't there?

A script that returns data as follows:

   update my.rrd 1022925600:1
   update my.rrd 1022925900:2 1022926200:3
   update my.rrd 1022926500:2 1022926800:1
   update my.rrd 1022927100:1
and so on (note: this is *text*, not command!)
you can pipe this to RRDtool.  Let's call the script "bulkupdater".

   bulkupdater | rrdtool -


HTH
Alex

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