Oracle Error ORA-26026: unique index string.string initially in unusable state

Oracle Error Message

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

Reason for the Error

A unique index is in IU state (a unique index cannot have

* index maintenance skipped via SKIP_UNUSABLE_INDEXES).

Solution

Either rebuild the index or index partition, or use

* SKIP_INDEX_MAINTENANCE if the client is SQL*Loader.