Oracle 12C -- plug unplugged PDB into CDB

connetct to CDB as a common user and verify that pdb_test is closed

SQL> select con_id,dbid,name,open_mode from v$pdbs;

    CON_ID       DBID NAME                           OPEN_MODE
---------- ---------- ------------------------------ ----------
         2 1258043702 PDB$SEED                       READ ONLY
         3 3749525766 PDB1                           READ ONLY
         4 2192587015 P4                             READ ONLY
         5  255759235 PDB_TEST                       READ WRITE

SQL> alter pluggable database pdb_test close;
SQL> alter pluggable database pdb_test unplug into '/tmp/xmlfile1.xml';
SQL> select con_id,dbid,name,open_mode from v$pdbs;

    CON_ID       DBID NAME                           OPEN_MODE
---------- ---------- ------------------------------ ----------
         2 1258043702 PDB$SEED                       READ ONLY
         3 3749525766 PDB1                           READ ONLY
         4 2192587015 P4                             READ ONLY
         5  255759235 PDB_TEST                       MOUNTED

A PDB must be dropped from the CDB before it can be plugged back into the same CDB

SQL> create pluggable database pdb_test using '/tmp/xmlfile1.xml' nocopy;
create pluggable database pdb_test using '/tmp/xmlfile1.xml' nocopy
*
ERROR at line 1:
ORA-65012: Pluggable database PDB_TEST already exists.


SQL> drop pluggable database pdb_test;
SQL> create pluggable database pdb_test using '/tmp/xmlfile1.xml' nocopy;
SQL> select con_id,dbid,name,open_mode from v$pdbs;

    CON_ID       DBID NAME                           OPEN_MODE
---------- ---------- ------------------------------ ----------
         2 1258043702 PDB$SEED                       READ ONLY
         3 3749525766 PDB1                           READ ONLY
         4 2192587015 P4                             READ ONLY
         5  255759235 PDB_TEST                       MOUNTED

SQL> alter pluggable database pdb_test open;
SQL> select con_id,dbid,name,open_mode from v$pdbs;

    CON_ID       DBID NAME                           OPEN_MODE
---------- ---------- ------------------------------ ----------
         2 1258043702 PDB$SEED                       READ ONLY
         3 3749525766 PDB1                           READ ONLY
         4 2192587015 P4                             READ ONLY
         5  255759235 PDB_TEST                       READ WRITE

SQL>