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Define these options in the Transformations view on Mapping tab of the session properties.
In Static Cache when the Lookup condition is true it return value from lookup table else returns Null or Default value.
Whenever the cache needs to be refreshed we just need to run the first mapping.
Note: Take into account that it is necessary to ensure data integrity in long run ETL process when underlying tables change frequently.
This “ORDER BY” clause is done by default and helps Informatica to save time and space to create its own index.
To avoid any sort, just add a comment at the end of the SQL override: Figure 5: To Avoid ORDER BY in SQL Override To sum up, it is possible to enhance Informatica lookups by using different set of configurations in order to increase performance as well as save resources and time.
Using multiple files will decrease the performance.
Hence, we might consider joining the lookup source table in the database.
The solution is using an Expression transformation that calls the lookup transformation that is not connected to the dataflow: Figure 4: Unconnected Lookup Transformation For instance, an Expression transformation will contain a port with the following expression: IIF (ISNULL (COUNTRY), : LKP.
LKP_COUNTRY (EMPLOYEE_ID), COUNTRY) If the COUNTRY is null, then the lookup named LKP_COUNTRY is called with the parameter EMPLOYEE_ID.