ORA-26026: unique index string.string initially in unusable state
Cause: A unique index is in IU state (a unique index cannot have

* index maintenance skipped via SKIP_UNUSABLE_INDEXES).

Action: Either rebuild the index or index partition, or use

* SKIP_INDEX_MAINTENANCE if the client is SQL*Loader.

ORA-26027
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ORA-26026unique index string.string initially in unusable state