I've been expirementing with MV for a couple of days. Interesting gotcha's for fast
refresh on
commit, but otherwise cool stuff. Now for the question.
If I have a base table of 1 millions rows of time series data and I want to produce
MVs for day,
month, and year aggregates, would it be better to:
a) base all the MVs back to the original table. Only one mv-log this way but if I
ever need to
perform a complete refresh, then this would require 3 scan/sort/group of the original
table.
b) base the day MV on the original table, the month MV on the day MV, and the year MV
on the month
MV. Requires 3 mv-logs but a complete refresh would progressively scan/sort/group
less data.
It may just boil down to a matter of taste.
Ron
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Author: Ron Thomas
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