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Warning: Extra  Extra caution should be taken when configuring the output database step so that any existing source data does not get accidentally overwritten. The output to database step has a variety of options which can be destructive to data. For example, it can drop such as dropping tables, truncate truncating (delete) data, add news adding new rows, and update updating existing data. It is recommended that a test database with test data is used when developing transformation flows. Further, the output data step is disabled by default when in edit mode (Run in Preview mode option). If you are confident that the database you are using is a test database, or that the underlying data is safe to delete, then and only then should you change this setting. If you have any concerns about this, please first contact your system administrator.