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Shubhamjain007 / openhab

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Make RRD4J persistence service queryable #165

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
the rrd4j persistence is not queryable like the db4 service. It should be 
possible to read values from rrd4j databases as well.

Original issue reported on code.google.com by teichsta on 3 Dec 2012 at 10:13

GoogleCodeExporter commented 8 years ago

Original comment by teichsta on 4 Dec 2012 at 12:33

GoogleCodeExporter commented 8 years ago

Original comment by kai.openhab on 12 Mar 2013 at 7:38

GoogleCodeExporter commented 8 years ago 
I have implemented this and made it the default persistence service (and 
removed db4o from the demo package).
Note that rrd by definition loses precision if you go back in time - it is now 
configured to be accurate for the last hour, only have a value per minute for a 
full day and 4 values a day for a full year. This should imho suffice for the 
most use cases in rules.

Original comment by kai.openhab on 12 Apr 2013 at 9:44