The Availability, Accuracy and Performance measures displayed in TM ART Central are all aggregated values; in the sense that the measures shown are calculated averages from a set of transactions. This provides a high level view and allows the analyst to detect any problems. Data aggregation occurs as soon as the Monitor results are returned to Central; the data at each aggregation level is then saved to a separate table in the database. After this process is complete, no further data aggregation takes place.
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