SQL & PL/SQL :: How To Check RowID Of Locked Row

session from user U1

C:Documents and Settingsuser>sqlplus u1/u123456@orcl

SQL*Plus: Release 10.2.0.1.0 - Production on Pn Wrz 12 12:56:14 2011

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Po│╣czono z:
Oracle9i Enterprise Edition Release 9.2.0.7.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.7.0 - Production

SQL> update u1.tab1 set u1.tab1.col1=3 where u1.tab1.col1=1;

1 wiersz zosta│ zmodyfikowany.

SQL>

and now i can check which table is locked

SQL> SELECT lo.session_id, lo.OBJECT_ID, obj.object_name FROM v$locked_object lo
2 INNER JOIN Dba_Objects obj ON obj.object_id = lo.OBJECT_ID;

SESSION_ID OBJECT_ID OBJECT_NAME
---------- ---------- --------------------------------------------------
34 13197 TAB1

but the question is why can i check row id of locked row?