If the PowerExchange Express CDC for Oracle source contains rows flagged with insert, update, delete, upsert operations, drag the imported object to the Mapping Designer and design your logic based on source columns.
If the rows in the PowerExchange Express CDC for Oracle source are not flagged with required operations, use the Update Strategy transformation to flag the rows for insert, update, delete, or upsert operation as required.
You must define a key column in the Google BigQuery target definition. While reading from a CDC source, you must define and map the key column in the CDC source to key column in the Google BigQuery target object. Else, the session fails.