ORA-30554: function-based index string.

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ORA-30554: function-based index string.string is disabled
Cause: An attempt was madeto access a function-based index that has been
marked disabled because the function on which the index depends has been
changed.
Action: Perform one of thefollowing actions: -- drop the specified index using the
DROP INDEX command -- rebuild the specified index using the ALTER INDEX
REBUILD command -- enable the specified index using the ALTER INDEX
ENABLE command -- make the specified index usable using the ALTER INDEX
UNUSABLE command