Some time ago I had an interesting case which I can use to clearly describe how one can be caught in measurement error trap.
But let us start at the beginning with this response time analysis:
Response Time Component Time % Elap AvgEla
---------------------------------------- ----------- ------- ---------
CPU service 3934.97s 48.39% 0.000716
un-accounted for time 1363.01s 16.76%
db file sequential read 1122.00s 13.80% 0.032253
gc buffer busy 451.73s 5.56% 0.011746
log buffer space 451.64s 5.55% 0.123974
buffer busy waits 176.79s 2.17% 0.029579
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