ALTER USER USERNAME DEFAULT ROLE ALL;

Question

Hi,
I want to know, what is the meaning of "ALTER USER CARDS DEFAULT ROLE ALL"

Answer 1

It's easy to understand things when you try them,
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, Oracle Label Security, OLAP, Data Mining
and Real Application Testing options
SQL> grant connect to newuser identified by newuser;
Grant succeeded.
SQL> conn newuser/newuser
Connected.
SQL> select * from session_roles;
ROLE
CONNECT
SQL> conn / as sysdba
Connected.
SQL> create role new_user;
Role created.
SQL> grant select any table to new_user;
Grant succeeded.
SQL> grant new_user to newuser;
Grant succeeded.
SQL> conn newuser/newuser
Connected.
SQL> select * from session_roles;
ROLE
CONNECT
NEW_USER
SQL> conn / as sysdba
Connected.
SQL> alter user newuser default role connect;
User altered.
SQL> conn newuser/newuser
Connected.
SQL> select * from session_roles;
ROLE
CONNECT
SQL> set role new_role;
set role new_role
ERROR at line 1:
ORA-01919: role 'NEW_ROLE' does not exist
SQL> set role new_user;
Role set.
SQL> select * from scott.dept;
    DEPTNO DNAME          LOC
        10 ACCOUNTING     NEW YORK
        20 RESEARCH       DALLAS
        30 SALES          CHICAGO
        40 OPERATIONS     BOSTONHTH
Aman....