Query struck for more than 2 days

 Hello ,Below is the query struck for more than 2 days but earlier it used to complete in 40 mins

SQL> /

BLOCKING_SESSION EVENT                                                            LAST_CALL_ET SQL_ID               SID

---------------- ---------------------------------------------------------------- ------------ ------------- ----------

                 latch: cache buffers chains                                             33825 3bw6jsn5t4wb9        189

Please advise.

select rows_processed from v$sql where sql_id='3bw6jsn5t4wb9';

ROWS_PROCESSED

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             0

Best regards,

Vishal