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PRTG data retention



  1. What is the shortest data interval that PRTG reports on?
  2. In what intervals does PRTG retain data?
  3. How long does PRTG retain 1 minute data in 1 minute interval before rolling that data into its next interval? For example if 1 minute is the shortest data interval monitored, does 1 minute data get rolled into 5 minute data after 1 hour?
  4. Can you change the length of time that an interval is retained? For example if 1 minute data is kept 60 minutes before rolling up to 5 minutes, can that 1 minute data retention be changed to 120 minutes?
  5. Where do I find the documentation for these answers?

edit by stephan
just modified the listing code so it's more readable.

1-minute-data data-retention prtg

Created on Jul 23, 2015 7:27:22 PM

Last change on Jul 24, 2015 6:07:56 AM by  Stephan Linke [Paessler Support]

1 Reply



Dear John Greene

Please let me outline how PRTG handles the sensor data.

PRTG stores each set of data with a time stamp with a precision of a millisecond. The scanning interval is used by the scheduler to perform a measurement. When PRTG computes a bandwidth using the traffic volume data difference, it uses the stored time stamps (and not the scanning interval) to correct for the possible jitter on the X axis.

If you create reports using 5 minute intervals while there is data for 1 minute, PRTG computes averages. The original resolution (in this example 1 minute) is kept in the historic data base, but over longer time frames, it would be impractical to render data with a time resolution of 1 minute, so PRTG uses averages over longer intervals instead. Those averages are derived from the original data which is stored in full resolution.

If the time frame is small enough, you can obtain historic data in the full resolution.

Created on Jul 27, 2015 11:45:28 AM by  Arne Seifert [Paessler Support]

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