    ALTER INDEX [ schema. ]index
      { { deallocate_unused_clause
        | allocate_extent_clause
        | shrink_clause
        | parallel_clause
        | physical_attributes_clause
        | logging_clause
        }
          [ deallocate_unused_clause
          | allocate_extent_clause
          | shrink_clause
          | parallel_clause
          | physical_attributes_clause
          | logging_clause
          ]...
      | rebuild_clause
      | PARAMETERS ('ODCI_parameters')
      | { ENABLE | DISABLE }
      | UNUSABLE
      | RENAME TO new_name
      | COALESCE
      | { MONITORING | NOMONITORING } USAGE
      | UPDATE BLOCK REFERENCES
      | alter_index_partitioning
      } ;