Oracle Error:

ORA-01045: user C##SCOTT lacks CREATE SESSION privilege; logon denied

Scenario:

Here, I was trying to access C##SCOTT user immediately after creation of it, Above mentioned oracle error itself self-explanatory. I had forgotten to grant CONNECT privilege to C##SCOTT user. After granting mentioned privileges, I was able to connect C##SCOTT user.

Error logs and solution:

SQL> create user C##SCOTT identified by tiger default tablespace users;
User created.
SQL> exit

Trying to connect C##SCOTT user:

[oracle@OL712c ~]$ sqlplus c##scott/tiger
SQL*Plus: Release 12.1.0.2.0 Production on Wed Dec 17 05:13:19 2014
Copyright (c) 1982, 2014, Oracle. All rights reserved.
ERROR:
ORA-01045: user C##SCOTT lacks CREATE SESSION privilege; logon denied

Connect as sysdba and grant required privileges:

[oracle@OL712c ~]$ sqlplus / as sysdba
SQL> grant connect,resource to C##SCOTT;
Grant succeeded.
SQL> exit

Successfully connect C##SCOTT after assigning required privileges.

[oracle@OL712c ~]$ sqlplus c##scott/tiger
SQL> show user;
USER is "C##SCOTT"

It was only problem with required privilege.