Question

Say in a data flow task, I have an OLE DB source. I would like to increase the performance of the SSIS. Does it matter where I SELECT less columns?

1. Create a view in database that SELECT less columns, use that as the source.

2. Type SQL SELECT inside the source to select less columns.

3. Choose the table then untick the columns inside the source.

Thank you

Answer 1

In SSIS ,you shouldn’t be using Table name or view from a variable as they tend to pull all the data .It behaves as Select *.

The adapter opens a rowset-based on the table or view. Then it calls OpenRowset
in the validation phase to retrieve column metadata, and later in the execution
phase to read out the data.

The best way is type out the SQL command which increases the performance . But using View ,
the performance is increased many folds .Check this article for using View in OLEDB SOurce