Available only for fuzzy key matching and only if Match Only Previous Rowid Objects is checked (selected).

If Match Only Once is enabled (checked), then once a record has found a match, Informatica MDM Hub will not match it any further within this search range (the set of similar match key values). Using this feature can reduce duplicates and increase performance. Instead of finding every match for a record in a search range, Informatica MDM Hub can find a single match for each. In subsequent match cycles, the merge process will put these into large groups of XREF records associated with the base object.

By default, this option is unchecked (disabled). If this feature is enabled, however, you can miss matches. For example, suppose record A matches record B, and record A matches record C, but record B and C do not match. You must assess the trade-off between performance and match quantity based on the characteristics of your data and your particular match requirements.