12c 用户的创建

12c 的账户可以分为公用账户和本地用户，共有账户是在CDB下创建，可以给所有的PDB用户使用，本地账户是只能在PDB中创建的账号

创建公共用户

alter session set container=CDB$ROOT;

create USER C##u02 identified by oracle container=all;

创建本地用户

alter session set container=pdb4;

create USER u01 identified by oracle container=current;

SQL> SELECT USERNAME,CON_ID,USER_ID FROM CDB_USERS WHERE USERNAME='U01';

USERNAME CON_ID USER_ID

------------------------------ ---------- ----------

U01
4 105

在CDB中创建测试账号

1 在CDB中创建账号必须以C##开头

alter session set container=CDB$ROOT;

SQL> create user orcl identified by a;

create user orcl identified by a

*

ERROR at line 1:

ORA-65096: invalid common user or role name

SQL> create user p##orcl identified by a;

create user p##orcl identified by a

*

ERROR at line 1:

ORA-65096: invalid common user or role name

SQL> create user c##a identified by a;

User created.

SQL> select username from dba_users where username like 'C##%';

USERNAME

--------------------------------------------------------------------------------

C##A

---说明本地用户不能以C##开头

alter session set container=pdb4;

SQL> create user c##B identified by B;

create user c##B identified by B

*

ERROR at line 1:

ORA-65094: invalid local user or role name

SQL> SELECT USERNAME,CON_ID,USER_ID FROM CDB_USERS WHERE USERNAME like 'C##%' ORDER BY USERNAME;

USERNAME CON_ID USER_ID

------------------------------ ---------- ----------

C##BOSWLL 4
103

C##BOSWLL 3
110

C##BOSWLL 1
102

C##BOSWLL 5
103

C##U02 4
106

C##U02 5
104

C##U02 1
103

C##U02 3
111

---创建公共用户时，不能在pdb中创建，必须在cdb中创建公共用户

SQL> alter session set container=pdb4;

Session altered.

SQL> create USER C##u02 identified by oracle container=all;

create USER C##u02 identified by oracle container=all

*

ERROR at line 1:

ORA-65050: Common DDLs only allowed in CDB$ROOT

总结：

1 公共用户必须以 C##开头，本地用户只能以字母开头，不能以C##用户开头

2 创建公共用户时，必须是在CDB$ROOT

3 如果在PDB中已经存在一个用户或者角色，则在CDB中不能创建相同的账号或者角色名