To build and analyze data lineage across catalog sources, assign or unassign objects from catalog sources to specific connections based on your requirements.
Connection assignments specify how objects in a catalog source can be related to matching objects in another catalog source. When you perform a sync job on an ETL catalog source, Metadata Command Center extracts connections from the ETL catalog source and creates a reference catalog source. A reference catalog source indicates that it contains references from other source systems along with the source and target tables mapping.
To ensure that the source connection maps accurately to the objects from the catalog source, you can manually assign these connections from reference catalog sources to objects from the configured catalog source. After you assign connections to objects in the catalog source, Metadata Command Center creates links between matching objects in the connected catalog sources and presents it in the form of percentage of matched objects versus unmatched objects. This percentage determines the accuracy of the data lineage information that you can view in Data Governance and Catalog.
Based on the percentage of matched and unmatched objects, you can assign or unassign connections using the Assign Connections tab on the Lineage tab of the Configure page. You can also monitor the status of the assign or unassign jobs on the Monitor page. You can then verify that the data lineage flow is accurate in Data Governance and Catalog.