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Execution is the process of starting the ETL logic defined in the deployed objects. For example, you define a mapping that sources data from a table, performs transformations on the source data, and loads it into the target table. When you deploy this mapping, the PL/SQL code generated for this mapping is stored in the target schema. When you execute this mapping, the job for the ETL logic is started and the data is picked up from the source table, transformed, and loaded into the target table.