Oracle Error Message
ORA-26029: index string.string partition string initially in unusable state
Reason for the Error
A partition of an index is in IU state prior to the beginning
* of a direct path load, it cannot be maintained by the loader.
Solution
Either rebuild index partition, re-create the index, or use either
* SKIP_UNUSABLE_INDEXES or SKIP_INDEX_MAINTENANCE (Sql*Loader only).