Where we use dynamic lookup and where we use it?do we generate surrogate keys using dynamic lookup?can we use it for scd type 2 mapping and why?Dynamic lookup means the lookup transformation will lookup in the lookup table during mapping execution using session i.e.,during runtime, example 'WHEN WE WANT TO GENERATE PRIMARY KEY AND FOR THAT WE HAVE TO USE UNCONNECTED LOOKUP TRANSFORMATION FOR LOOKING UP INTO THE TARGET FOR EACH NEW ROW AND THAT IS DYNAMIC LOOKUP OR RUNTIME LOOKUP'. SCD type 2 indicates history preservation of records i.e.., update the existing record using last update date and inserting its new instance with new key. it dosent matter to use with SCD1 or SCD2 we can use it as per our requirement. one more example is "loading fact tables by looking up into dimension tables"