Question: I want to drop some users in Oracle DB using sqlplus but I am getting error:

```
SQL> DROP USER test CASCADE;
DROP USER test CASCADE
*
ERROR at line 1:
ORA-01940: cannot drop a user that is currently connected

```

I followed the link in SO to find out the sessions - [Dropping a connected user from an Oracle 10g database schema](https://stackoverflow.com/questions/85804/dropping-a-connected-user-from-an-oracle-10g-database-schema)

But when I ran the command I am not getting any results:

```
SQL> select sid,serial# from v$session where username = 'test';

no rows selected

```

Please help me how to drop users in this case.

Answer: 
Users are all capitals in `v$session` (and data dictionary views). If you match with capitals you should find your session to kill.

```
SELECT s.sid, s.serial#, s.status, p.spid 
  FROM v$session s, v$process p 
 WHERE s.username = 'TEST' --<<<--
  AND p.addr(+) = s.paddr
 /

```

Pass actual SID and SERIAL# values for user TEST then drop user...:

```
ALTER SYSTEM KILL SESSION '<SID>, <SERIAL>'
/

```
I had the same problem, Oracle config in default affects letter register. In exact my Scheme\_Name was written all Capital letters. You can see your Scheme\_Name on "Other Users" tab, if you are using Oracle S