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