Question

What is the use of Multicast Transformation Task ? With this task, is it possible to send to two destinations from a single source, while each destination has different columns ?

Answer 1

I assume that you are referring to Multicast Transformation inside the Data Flow task. If so, yes it is possible. The purpose of the transformation is to channel data from a single source to n number of Transformation tasks or Destinations.

If source has following columns

Source
Column 1
Column 2
Column 3

and destinations have these columns.

Destination 1   Destination 2
Column 1        Column 2
Column 3

Both destinations will be able to see Columns 1 – 3 that are available in Source. You have to map the columns accordingly in the respective destinations. Refer below example:

Example:

1. Screenshot #1 shows that Source has two columns Header and Value.
2. Screenshot #2 shows that Destination 1 has both columns Header and Value. They are mapped accordingly.
3. Screenshot #3 shows that Destination 2 has only column Header. It is mapped accordingly.
4. Screenshot #4 shows sample package execution.

Hope that helps.

Screenshot #1:

Screenshot #2:

Screenshot #3:

Screenshot #4: