1.查看数据库的创建模式

SQL> select name,cdb,con_id from v$database;
NAME      CDB     CON_ID
---------    ---------    ----------
ORA12C    YES          0

显示yes为数据库为CDB模式

 

SQL> show con_name
CON_NAME
------------------------------
CDB$ROOT

 

SQL> select sys_context(‘userenv‘,‘con_name‘) from dual;
SYS_CONTEXT(‘USERENV‘,‘CON_NAME‘)
--------------------------------------------------------------------------------
CDB$ROOT