How to query the username....

Question

Hello folks,
please can anyone help me on how to get the username of a user who is locking a specific row, for example if a user in a multi-user application is locking the record where emp_id=10 and name=X, how can I get his name?????
and thank you in advance

Answer 1

Hi fish,
deadlocks are different things. Oracle documentation says : "A deadlock can occur when two or more users are waiting for data locked by each other" and "Oracle automatically detects deadlock situations and resolves them by rolling back one of the statements involved in the deadlock"
See http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14220/consist.htm#sthref2043
See my example (ora102 is OS user and lock1 is my script above) :
Session 1 :
SCOTT@db102 SQL> update emp set sal=3000 where empno=7902;
1 row updated.
SCOTT@db102 SQL>Session 2 :
SCOTT@db102 SQL> update emp set sal=3000 where empno=7902;
... hangsSysdba session :
SYS@db102 SQL> @lock1
TO_CHAR(SYSDATE,'DD
17/05/2006 16:25:54
BLOCKER                     SID 'BLOCKS' BLOCKEE                     SID USERNAME
ora102                      148  blocks  ora102                      158 SCOTT
OBJECT_NAME                           SID ORACLE_USERNAME      TY      LMODE    REQUEST
EMP                                   148 SCOTT                TX          6          0
SYS@db102 SQL>