RPO Measurement
- Last UpdatedNov 15, 2018
- 1 minute read
The RPO measurement is the time interval during which there is no data being entered in the MES database.
RPO = RPO (T2) – RPO (T1)
where
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T1 = The time-stamp of the last record entered in the MES database at or before RTO (T1); that is, (RPO (T1) <= RTO (T1)).
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T2 = The time-stamp of the first record entered in the MES database at or after RTO (T2); that is, (RPO (T2) >= RTO (T2)).
It is possible that RPO is less than RTO, since there is a client middleware layer that allows for serialization of events while the MES Middleware service is unavailable. If RPO = 0, this implies that no events were missed.
Custom SQL queries were developed and run against the MES database to determine the time-stamp of the "last" record before an HADR fault and the "first" record following an HADR fault.