CRUD Operation Header Attributes

When the Oracle CDC Client is configured to parse the SQL query, it specifies the operation type in both of the following record header attributes when generating records:
sdc.operation.type
The Oracle CDC Client evaluates the Oplog operation type associated with each entry that it processes and, when appropriate, it writes the operation type to the sdc.operation.type record header attribute.
The origin uses the following values in the sdc.operation.type record header attribute to represent the operation type:
  • 1 for INSERT
  • 2 for DELETE
  • 3 for UPDATE and SELECT_FOR_UPDATE

If you use a CRUD-enabled destination in the pipeline such as JDBC Producer or Elasticsearch, the destination can use the operation type when writing to destination systems. When necessary, you can use an Expression Evaluator processor or any scripting processor to manipulate the value in the header attribute. For an overview of Data Collector changed data processing and a list of CRUD-enabled destinations, see Processing Changed Data.

When using CRUD-enabled destinations, the destination looks for the operation type in the sdc.operation.type attribute before checking the oracle.cdc.operation attribute.
oracle.cdc.operation
The Oracle CDC Client also writes the Oplog CRUD operation type to the oracle.cdc.operation record header attribute. This attribute was implemented in an earlier release and is supported for backward compatibility.
The origin writes the Oplog operation type to the oracle.cdc.operation attribute as the following strings:
  • INSERT
  • UPDATE
  • SELECT_FOR_ UPDATE
  • DELETE
CRUD-enabled destinations check for this attribute for the operation type after checking the sdc.operation.type attribute.