oracle 12c 中CDB模式 换成 PDB模式，只能重装数据库吗？

SQL> show pdbs

CON_ID CON_NAME OPEN MODE RESTRICTED

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

2 PDB$SEED READ ONLY NO

3 ORCLPDB READ WRITE NO

2.切换到pdb

SQL> alter session set container=ORCLPDB;

Session altered.

3切换回CDB

SQL> alter session set container=CDB$ROOT;

Session altered.