ORA-23626: No eligible index on table string

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ORA-23626: No eligible index on table string.string
Cause: Table did not have aneligible index to use for comparison.
ORA-19999 toORA-24279 15-61
Action: For a table to becompared using DBMS_COMPARISON, the table must
have an appropriate index on a column of certain data types. Check the
documentation for supported data types.