Lookup condition

Description

1 INFA (Lookup Transformation) Mind Map on Lookup condition, created by dbrown on 10/11/2013.
dbrown
Mind Map by dbrown, updated more than 1 year ago
dbrown
Created by dbrown about 11 years ago
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Resource summary

Lookup condition
  1. like a WHERE clause
    1. Data types must match
      1. must have
        1. multiple conditions
          1. evaluates as AND
          2. Optimize order
            1. 1- equal =
              1. 2<,>,<=,>=
                1. 3 (not) !=
            2. matches NULL values
              1. dynamic cache
                1. can only use = (equal)
                2. Handling Multiple Matches
                  1. Use first or last value
                    1. lookup cache order
                    2. use any
                      1. create index on keys
                      2. return ALL rows
                        1. active
                          1. cant switch
                        2. return an error
                          1. static or no cache
                            1. marks the row
                              1. shows in session log
                                1. increases error count
                            2. dynamic
                              1. fails the session
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