oracel become INDEX UNUSABLE

1. IMPORT PARTITION or conventional path SQL*Loader.

2. Direct-path SQL*Loader leaves affected local index partitions and global indexes in an IU state if it does not complete successfully.

3. Partition maintenance operations like ALTER TABLE MOVE PARTITION.

4. Partition maintenance operations like ALTER TABLE TRUNCATE PARTITION.

5. Partition maintenance operations like ALTER TABLE SPLIT PARTITION.

6. Index maintenance operations like ALTER INDEX SPLIT PARTITION.

7. Adding a Partition to a Hash-Partitioned Table