ORA-01917: user or role does not exist

I got ” ORA-01917: user or role does not exist ”  error in Oracle database.

ORA-01917: user or role does not exist

Details of error are as follows.

ORA-01917: user or role 'string' does not exist.

Cause: There is not a user or role by that name.

Action: Re-specify the name.


SQL> grant sysdba to mehmet;
grant sysdba to mehmet
*
ERROR at line 1:
ORA-01917: user or role 'mehmet' does not exist

user or role ‘string’ does not exist

This ORA-01917 error is related with the user or role by that name.

Re-specify the name or create the related user as follows.

SQL> grant sysdba to mehmet;
grant sysdba to mehmet
*
ERROR at line 1:
ORA-01917: user or role 'mehmet' does not exist


SQL> create user mehmet identified by deveci;

User created.

SQL> grant sysdba to mehmet;

Grant succeeded.

SQL>

Created a schema to install a system but everything I try to do I get the ORA-01917 message: user or role ‘X’ does not exist, but the schema exists, I can view it but I can’t do anything. I am asking the Support assistance to identify the issue.

SQL> select username from dba_users where username='test_user';

USERNAME
------------------------------
test_user <<<<<<<<<<<<<<<<<<<<< User exist in the database





SQL> select * from test_user.table1;
select * from test_user.tableq
*
ERROR at line1:
ORA-00942: table or view does not exist



SQL> grant create session to test_user; <<<<<<<< But hitting ORA-1917, user test_user does not exist
grant create session to test_user
*
ERROR at line 1:
ORA-01917: user or role 'TEST_USER' does not exist



SQL> drop user test_user cascade; <<<<<<<<<<<<<< While dropping this user, again Oracle says user does not exist
drop user test_user cascade
*
ERROR at line 1:
ORA-01918: user 'TEST_USER' does not exist




drop user test_user cascade; <<<< Throws USER does not exist error message

ORA-01918 found because the user should have been created with double quote and forced Oracle to create the user in lower case

In the 1st query result from dba_user, you are seeing test_user in dba_users instead of TEST_USER, by default the username is saved in Upper case only.
Only if the user is created forcefully with lower case using double quotes, then the user will get stored in Lower case.

For example:
create user “test_user” identified by ………….

Because of the usage of double quotes, the username will be forced to be stored as lower case.

So kindly try out :

SQL> select * from "test_user".table1; <<<<<<<<<<<< You should be able to fetch the result

and/or

SQL> drop user "test_user" cascade; <<<<<<<<<<<< This would drop this user, because we are using double quotes

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