Rebuilding unusable indexes, index partitions, and index subpartitions.

select 'alter index '||owner||'.'||index_name||' rebuild;' from dba_indexes where status='UNUSABLE';
select 'alter index '||index_owner||'.'||index_name||' rebuild partition '||partition_name||';' from dba_ind_partitions where status='UNUSABLE';
select 'alter index '||index_owner||'.'||index_name||' rebuild subpartition '||subpartition_name||';' from dba_ind_subpartitions where status='UNUSABLE';