How to know if Index is used by a program or job

Hi,
I am having this problem on how to check if a specific index such as /BIC/B0000** is used by a job or program. This is because I am woking on the Oracle Cost-Based Optimizer to be updated in a weekly schedule. But before a change in the schedule is done for the optimizer and checking through index, there was an index in an UNUSABLE STATE.
SQL> select INDEX_NAME,INDEX_TYPE,STATUS from dba_indexes where index_name like '/BIC/B0000881001KE';
INDEX_NAME INDEX_TYPE STATUS
/BIC/B0000881001KE NORMAL UNUSABLE
So I cannot proceed because I need to know if this index is used by a program. Can you help me on this?

Hi
Take a look at SAP Note 184905 - Collective note on performance Several notes related to indexing can be found in the same

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