Lookup condition

Descrição

1 INFA (Lookup Transformation) Mapa Mental sobre Lookup condition, criado por dbrown em 10-11-2013.
dbrown
Mapa Mental por dbrown, atualizado more than 1 year ago
dbrown
Criado por dbrown aproximadamente 11 anos atrás
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Resumo de Recurso

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

                          Semelhante

                          Lookup trans
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                          Properties of Lookup
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                          Lookup query
                          dbrown
                          Lookup Ports
                          dbrown
                          Returning multiple rows
                          dbrown
                          Lookup Cache
                          dbrown
                          Database Deadlock Resilience
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                          Lookup query - created from Mind Map_1
                          dbrown
                          Transformation Functions
                          dbrown
                          Lookup Ports - created from Mind Map
                          dbrown
                          Lookup Cache - created from Mind Map
                          dbrown