Answer Posted / nasa

these are three types
type-1
type-2
type-3

type-1: it will not maintain historical data... that means
if you update the record it store but it will remove
previous data

type-2: type -2 maintain historical data. it store new data
by row wise..

type-3: type-3 also maintain historical data but it stores
data column wise and it allow limited nearly 250



but type allow more that 250 so type-2 is the best...

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