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select 'blocker('||wb.holding_session||':'||sb.username||')-sql:'||qb.sql_text blockers,sb.machine,sb.terminal,
'waiter ('||wb.waiting_session||':'||sw.username||')-sql:'||qw.sql_text waiters ,sw.machine,sb.terminal,
wb.LOCK_TYPE, wb.mode_held,wb.mode_requested,wb.lock_id1, wb.lock_id2
from dba_waiters wb,
v$session sb,
v$session sw,
v$sqlarea qb,
v$sqlarea qw
where wb.holding_session=sb.sid
and wb.waiting_session=sw.sid
and sb.prev_sql_addr=qb.address
and sw.sql_address=qw.address
and wb.mode_held<>'None';