Why do we need unconnected lookup transformation in Informatica?

You can use an unconnected Lookup transformation to replace cryptic or numeric ID values in a table with meaningful names from a lookup table. The name that is associated with each ID is stored in a reference table. Use an unconnected Lookup transformation to retrieve the names from the reference table.

What are connected and unconnected transformations in Informatica?

Connected transformation is connected to other transformations or directly to target table in the mapping. An unconnected transformation is not connected to other transformations in the mapping. It is called within another transformation, and returns a value to that transformation.

How does connected lookup work in Informatica?

Perform the following tasks with a Lookup transformation:

1. Get a related value. Retrieve a value from the lookup table based on a value in the source.
2. Get multiple values. Retrieve multiple rows from a lookup table.
3. Update slowly changing dimension tables. Determine whether rows exist in a target.

What is the difference between Joiner and lookup transformation in Informatica?

Joiner is used for joining two homogeneous or heterogeneous sources residing at different locations. Lookup is used to look-up the data. Joiner is an Active Transformation. Lookup transformation is a Passive transformation.

How is unconnected lookup transformation managed in Informatica?

The unconnected lookup transformation is not connected to the flow-through source or target. A checkbox option can manage it in the general tab of lookup transformation. Informatica cloud manages lookup transformation by return only one matching value to the calling transformation.

What is the difference between a connected lookup and an unconnected lookup?

A connected Lookup transformation is a transformation that has input and output ports that you connect to other transformations in a mapping. An unconnected Lookup transformation appears in the mapping, but is not connected to other transformations.

What are the two types of lookup in Informatica?

There are two types. Connected lookup is part of the ETL pipeline mapping of the Informatica cloud. It receives source value, processes the lookup transformation and returns the data to the pipeline flow. The connected lookup is connected though lookup ports.

Do you have to call every unconnected lookup?

In unconnected lookups, its not necessary that we call it for every row. Because its unconnected, and not connected to the data flow pipeline, we can choose to call when it meets certain conditions.