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 mehr als 10 Jahre
44
0

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
                          dbrown
                          Properties of Lookup
                          dbrown
                          Lookup query
                          dbrown
                          Lookup Ports
                          dbrown
                          Returning multiple rows
                          dbrown
                          Lookup Cache
                          dbrown
                          Database Deadlock Resilience
                          dbrown
                          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