Lookup condition

Beschreibung

1 INFA (Lookup Transformation) Mindmap am Lookup condition, erstellt von dbrown am 10/11/2013.
dbrown
Mindmap von dbrown, aktualisiert more than 1 year ago
dbrown
Erstellt von dbrown vor etwa 11 Jahre
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Zusammenfassung der Ressource

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
                          Zusammenfassung anzeigen Zusammenfassung ausblenden

                          ähnlicher Inhalt

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