When working in simulation mode, you can divide the entire result set of the
datasource (as defined by a query in the source or staging component) into data
blocks, which contains a subset of records.
The number of records in each
subset is related to the Read Block Size parameter, which appears in the
Property window of the component. To enhance performance when stepping
through the project, select a small number for the Read Block Size parameter.
- Step through the project, including the component you want to preview.
- Right-click the component, port, or connecting link, and select Preview.
If a component has multiple ports, first select the port for which you are
previewing transformation results.