what is the main differences between Lookup, Join and Merge
stages?
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Answer Posted / venki
lookup having one input link and n intermediate links one
reference link and one optional reject link
input data in sorted order
fore types of look are there
1.normal lookup
2.sparce lookup
these two more added in 8.1
3.range lookup
4.caseless sensitive
normal lookup
while doing normal lookup frist the reference data is
loaded in to memory this is used when the reference data in
high
sparce lookup
while doing the sparce lookup first for each input record
generate a sql quarry and made the operation in datadase
only one reference link the reference link should be
database or lookup file set only no intermediate links
this is used when the reference data is in low
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