Sys_context while migrating from DB 9i to 10g

Question

Hi friends,
We have been migrating our database from 9i to 10g. In 9i, the sql command
select nvl(sys_context('user_env','osuser'),'?') from dual
return the name of the user with which you have logged in. But after migrating DB to oracle 10g, this query returns null value.
What may be the reason ? What may be the possible solution ?
Nirav

Answer 1

Here is an example:
SQL> select nvl(sys_context('user_env','osuser'),'?') from dual ;
NVL(SYS_CONTEXT('USER_ENV','OSUSER'),'?')
SQL> select nvl(sys_context('userenv','osuser'),'?') from dual ;
select nvl(sys_context('userenv','osuser'),'?') from dual
ERROR at line 1:
ORA-02003: invalid USERENV parameter
SQL> select nvl(sys_context('userenv','os_user'),'?') from dual ;
NVL(SYS_CONTEXT('USERENV','OS_USER'),'?')
kkishore
SQL> disconnect
Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL>And here is an example on Oracle9i that has the same results. can you post an example on 9i where it works as you have posted?
SQL> select nvl(sys_context('user_env','osuser'),'?') from dual ;
NVL(SYS_CONTEXT('USER_ENV','OSUSER'),'?')
SQL> select nvl(sys_context('userenv','osuser'),'?') from dual ;
select nvl(sys_context('userenv','osuser'),'?') from dual
ERROR at line 1:
ORA-02003: invalid USERENV parameter
SQL> select nvl(sys_context('userenv','os_user'),'?') from dual ;
NVL(SYS_CONTEXT('USERENV','OS_USER'),'?')
kkishore
SQL> disconnect
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.5.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.5.0 - Production
SQL>