The Integration Service generates a sequence in the NEXTVAL port based on the Current Value and Increment By properties in the Sequence Generator transformation.
The Current Value property is the value at which the Integration Service starts creating the sequence for each session. Increment By is the integer the Integration Service adds to the existing value to create the new value in the sequence. By default, the Current Value is set to 1, and Increment By is set to 1.
For example, you might create a Sequence Generator transformation with a current value of 1,000 and an increment of 10. If you pass three rows through the mapping, the Integration Service generates the following set of values: