Working with FOR UPDATE

Question

Hi,
i have 2 session(A, B) and trying to execute sql statement with For update clause
Session A
select * from emp where empid in (10) for update nowait;
Session B
select * from emp where empid in (10, 20) for update nowait;
my question is after executing select statement in sessin B will oracle locks
empid =20 or it will ignore the lock as part of it (empid=10) is already locked by
session A.
Can anyone plz help me in this..
Rds,
Naga

Answer 1

Why not try it out?:
Session A:
SQL> select empno,ename from emp where empno in (7788) for update nowait;
     EMPNO ENAME
      7788 SCOTTSession B:
SQL> select * from emp where empno in (7788,7900) for update nowait;
select * from emp where empno in (7788,7900) for update nowait
ERROR at line 1:
ORA-00054: resource busy and acquire with NOWAIT specifiedSesson A again:
SQL> select empno,ename from emp where empno in (7900) for update nowait;
     EMPNO ENAME
      7900 JAMES