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Informal testing only, on an in-use system; i.e. clock times
especially, may appear suspect. The full table was loaded into memory
with SETOBJACC with plenty spare, just before each test.
The SQL for each test, the file layout, and the validation that
rounding was as expected:
update qtemp.updtst set _outcome =_ <see result matrix>
Field Type Len Dec
ORIGINAL PACKED 19 2
EXPECTED PACKED 16 2
OUTCOME PACKED 16 2
select count(*) from qtemp.updtst
where outcome <> expected
A test for 1.25M rows, five immediate successive updates:
_clock_ _CPU_ _outcome = _
135.44 108.79 round(original / 1000, 2)
124.74 100.32 round(original * .001, 2)
127.82 98.91 original * .001 + .005 /* target P(x, 2) */
The following as above, but cast to target type explicitly:
_clock_ _CPU_ _outcome = _
118.83 96.02 decimal( round(original / 1000, 2), 16, 2)
111.38 88.84 decimal( round(original * .001, 2), 16, 2)
109.74 89.11 decimal( original * .001 + .005, 16, 2)
Regards, Chuck
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