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Webtags (preserving history): Difference between revisions
Webtags (preserving history) (view source)
Revision as of 09:35, 1 August 2021
, 09:35, 1 August 2021→Legacy release 1.9.3 to MX 3.11.4
m (→MX release 3.12.0 (beta build 3134) onwards: clarify) |
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====Legacy release 1.9.3 to MX 3.11.4==== | ====Legacy release 1.9.3 to MX 3.11.4==== | ||
The 'recent historical data' is based on an array stored by the Cumulus code. Therefore, if Cumulus stops, all the high resolution data is lost. | The 'recent historical data' is based on an array stored by the Cumulus code, it is actually held in a [https://cumulus.hosiene.co.uk/viewtopic.php?p=100098#p100098 SQLite database], but the database is held '''in-memory''', not as an external database, so it only exists while Cumulus is running. Therefore, if Cumulus stops, all the high resolution data is lost. | ||
When you do restart MX, if your weather station can store historic data, then its logger is read during the restart as archive data for the period from 7 days ago until the time of restart, and obviously only available at the station logging interval resolution of that historic data (be it every 10 minutes, or every 30 minutes or whatever). | When you do restart MX, if your weather station can store historic data, then its logger is read during the restart as archive data for the period from 7 days ago until the time of restart, and obviously only available at the station logging interval resolution of that historic data (be it every 10 minutes, or every 30 minutes or whatever). | ||