Altering the username........

Question

Please help the problem...
I am using Oracle 11g on my XP system
First i logon as sysdba... and created a user called "emp" by the statement below
SQL> create user emp identified by a;
User created.
SQL> grant all privileges to emp;
Grant succeeded.
SQL> conn
Enter user-name: emp
Connected.
SQL> connect / as sysdba
Connected.
SQL> select user#,name from user$;
USER# NAME
0 SYS
1 PUBLIC
2 CONNECT
3 RESOURCE
4 DBA
5 SYSTEM
6 SELECT_CATALOG_ROLE
7 EXECUTE_CATALOG_ROLE
8 DELETE_CATALOG_ROLE
9 OUTLN
10 EXP_FULL_DATABASE
USER# NAME
11 IMP_FULL_DATABASE
12 LOGSTDBY_ADMINISTRATOR
13 DIP
14 TSMSYS
15 AQ_ADMINISTRATOR_ROLE
16 AQ_USER_ROLE
17 DATAPUMP_EXP_FULL_DATABASE
18 DATAPUMP_IMP_FULL_DATABASE
19 GATHER_SYSTEM_STATISTICS
20 ORACLE_OCM
41 XDB
USER# NAME
21 RECOVERY_CATALOG_OWNER
22 SCHEDULER_ADMIN
23 HS_ADMIN_ROLE
24 GLOBAL_AQ_USER_ROLE
25 OEM_ADVISOR
26 OEM_MONITOR
27 DBSNMP
28 WMSYS
29 WM_ADMIN_ROLE
30 JAVAUSERPRIV
31 JAVAIDPRIV
USER# NAME
32 JAVASYSPRIV
33 JAVADEBUGPRIV
34 EJBCLIENT
35 JMXSERVER
36 JAVA_ADMIN
37 JAVA_DEPLOY
38 EXFSYS
39 CTXSYS
40 CTXAPP
2147483638 XS$NULL
42 ANONYMOUS
USER# NAME
43 XDBADMIN
44 XDB_SET_INVOKER
45 AUTHENTICATEDUSER
46 XDB_WEBSERVICES
47 XDB_WEBSERVICES_WITH_PUBLIC
48 XDB_WEBSERVICES_OVER_HTTP
61 SPATIAL_WFS_ADMIN
49 ORDSYS
50 ORDPLUGINS
51 SI_INFORMTN_SCHEMA
52 MDSYS
USER# NAME
53 ORDADMIN
54 OLAPI_TRACE_USER
55 OLAP_XS_ADMIN
56 OLAPSYS
57 OLAP_DBA
58 CWM_USER
59 OLAP_USER
60 MDDATA
82 HR
62 SPATIAL_WFS_ADMIN_USR
63 WFS_USR_ROLE
USER# NAME
64 SPATIAL_CSW_ADMIN
65 SPATIAL_CSW_ADMIN_USR
66 CSW_USR_ROLE
67 WKSYS
68 WKPROXY
69 WKUSER
70 WK_TEST
71 SYSMAN
72 MGMT_USER
73 MGMT_VIEW
74 FLOWS_FILES
USER# NAME
75 APEX_PUBLIC_USER
76 FLOWS_030000
77 OWBSYS
78 OWB$CLIENT
79 OWB_DESIGNCENTER_VIEW
80 OWB_USER
81 SCOTT
113 NEXTUSER
83 OE
84 IX
85 SH
USER# NAME
86 PM
87 BI
88 A
89 C
91 STUDENT
110 z
112 EMP
108 nat
96 rows selected.
When i attempt to rename my username... then it succeed..
SQL> update user$ set name='dept' where user#=112;
1 row updated.
But now i am trying to logon with my new username "dept" it is not taking ....
SQL> conn
Enter user-name: dept
ERROR:
ORA-01017: invalid username/password; logon denied
and also when i was trying to reset the password of my new username dept it also getting error message
SQL> alter user dept identified by abc;
alter user dept identified by abc
ERROR at line 1:
ORA-01918: user 'DEPT' does not exist
Can you please help me regarding this
.

Answer 1

There is no other solution than to drop and recreate your database.
What you did is absolutely forbidden by Oracle and the pain you are feeling is precisely the pain you deserve to feel for what you did.
About the only question left on the table is whether you deserve the pain because through ignorance, you thought you could drive
the car without getting a driver's license, or through intent, you knew you should have a license before you drove but you did it
anyway.
We can all argue about whether it is or isn't one of the dumbest things about the implementation of users in the Oracle database but
the ONLY approved way to do it is to export the data, create a new user, and reimport the data into a schema owned by the new user.
Count this as an important lesson learned. The Oracle Database is not a toy like MS Access. You MUST read the documentation or
you WILL suffer the consequences.