Scriprt For Finding Unusable Index :

This scripts using finding unusable index.

SET VERIFY OFF LINESIZE 200
COLUMN owner FORMAT A30
COLUMN index_name FORMAT A30
COLUMN table_owner FORMAT A30
COLUMN table_name FORMAT A30

SELECT owner,
       index_name,
       index_type,
       table_owner,
       table_name
       table_type
FROM   dba_indexes
WHERE  owner = DECODE(UPPER('&1'), 'ALL', owner, UPPER('&1'))
AND    status NOT IN ('VALID', 'N/A')
ORDER BY owner, index_name;