7. Understanding Ingres Star Catalogs : Mapping Ingres Star Objects : Index Mapping
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Index Mapping
Each index of a local table introduced by a register is promoted as an index and given a registered name composed of the prefix ddx, the base, and the index of the object id, separated by the special character, _, for example, ddx_2002_2003.
Indexes are automatically mapped during the register statement to iiindexes and iiindex_columns. You cannot create secondary indexes with Ingres Star.