use MAX() instead of SUM() for latency measurements #1
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Using SUM() results in multi-second latency measurements when multiple files are used for a database - which is typical for tempdb. Using MAX() gives a more meaningful measurement. AVG() can be used as well but will hide problems when one of the db files encounters a problem. Example: File0: 30ms File1: 40ms File2: 50ms File3: 60ms File4: 70ms File5: 80ms File6: 90ms SUM (currently what is reported) results in 420 ms latency, MAX (current proposal) in 90ms and AVG in 60ms
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Using SUM() results in multi-second latency measurements when multiple files are used for a database - which is typical for tempdb. Using MAX() gives a more meaningful measurement. AVG() can be used as well but will hide problems when one of the db files encounters a problem. Example:
File0: 30ms
File1: 40ms
File2: 50ms
File3: 60ms
File4: 70ms
File5: 80ms
File6: 90ms
SUM (currently what is reported) results in 420 ms latency, MAX (current proposal) in 90ms and AVG in 60ms
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