Wednesday, 26 October 2016

Static vs Dynamic Lookup in Informatica

Difference between Static vs Dynamic Lookup In Informatica

Static Lookups: 

These are are used when you want to lookup a value on a static table or a SQL query based on certain matching conditions. It caches the values when the static lookup in created at the begining of the execution of the session. If the values in the lookup tables are changing and you want the changed values to be reflected during execution of the session then you need to use dynamic cache. 
When you create a lookup transformation it by defaults creates a static cache. Static lookups can be connected or unconnected depending on weather you want multiple or single value to be returned from the lookup.  Check out unconnected transformation here.

Dynamic Lookups: 

These kind of lookups are required when you want the changes happening in the lookup table to be reflected during the execution of the mapping/session. You can create dynamic lookups by setting Dynamic lookup Cache property in the properties section of the lookup transformation. When you make the lookup dynamic, you will observe in ports tab that a new field called NewLookupRow is created automatically. This NewlookupRow port will indicate if a row has been inserted or updated in the cache. In the dynamic lookup the records gets inserted or updated in the cache depending on weather the rows existed or not existed in the cached. 

Use of NewLookupRow in Dynamic Cache:

NewLookupRow port can have the following values:-
0 - Indicates that powercenter did not update or insert the row in the cache.
1 - Indicates that powecenter inserted the row into the cache because it is a new row
2-  Indicates that powecenter updated the row in the cache because the lookup value has changed.

Using the above values you can decide using update or filter transformation what you want to do with those rows coming of the source. Like for example if you want to insert it into the target table or update it? If NewLookupRow=1 then insert it to the target table or if it equal to 2 then update the record in the target table.