Oracle 12c Relocate PDB

在oracle 12.2中可以对pdb执行relocate失踪,下面的例子将介绍对远程CDB中将名为jypdb的PDB进行迁移操作。假设满足以下条件:
.当前用户在被迁移PDB所在的CDB的root容器中有create pluggable database系统权限

.目标CDB连接PDB当前CDB的dblink名为jycdb_link。dblink的创建语句如下:

create public database link jycdb_link connect to c##yyl
identified by "yyl" using 'jy';

PDB的当前CDB中的公共用户c##yyl有sysoper管理权限与create pluggable database系统权限

.不指定path_prefix子句

.不指定file_name_convert与create_file_dest子句。当启用OMF或设置pdb_file_name_convert参数时,基于OMF的配置或参数的设置文件会被移动到新目录。

.对PDB不指定存储限制。因此不指定storage子句

.在目标目录中不存在相同名字的temp文件,那么新的temp文件会被创建。因此不指定tempfile reuse子句。

.连接会被自动从源PDB迁移到迁移后的PDB。因此指定availability max子句。

执行以下语句来将PDB(jypdb)从远程CDB迁移到当前CDB中:
1.在远程CDB中创建公共用户c##yyl

SQL> create user c##yyl identified by "yyl" container=all;

User created.

SQL> grant sysoper,connect,resource,create pluggable database to c##yyl container=all;

Grant succeeded.

2.检查远程CDB是否使用本地undo与归档

SQL> COLUMN property_name FORMAT A30
SQL> COLUMN property_value FORMAT A30
SQL>
SQL> SELECT property_name, property_value
  2  FROM   database_properties
  3  WHERE  property_name = 'LOCAL_UNDO_ENABLED';

PROPERTY_NAME                  PROPERTY_VALUE
------------------------------ ------------------------------
LOCAL_UNDO_ENABLED             TRUE


SQL> SELECT log_mode FROM   v$database;

LOG_MODE
------------
ARCHIVELOG

因为远程CDB使用本地undo与归档,因此不需要将远程数据库设置为只读模式

3.在本地CDB(jy)中创建指定远和CBD(jy)的dblink。连接串中要包含(SERVER=DEDICATED)条目录,否则会收到 “ORA-01031: insufficient privileges”错误

SQL> create public database link jycdb
  2    connect to c##yyl identified by "yyl"
  3    using '(DESCRIPTION =
  4      (ADDRESS_LIST =
  5        (ADDRESS = (PROTOCOL = TCP)(HOST =10.138.130.173)(PORT = 1521))
  6      )
  7      (CONNECT_DATA =
  8        (SERVER = DEDICATED)
  9        (SERVICE_NAME =jy)
 10      )
 11    )';

Database link created.


SQL> select * from dual@jycdb;

D
-
X

4.检查本地CDB是否使用了本地undo与归档

SQL> COLUMN property_name FORMAT A30
SQL> COLUMN property_value FORMAT A30
SQL>
SQL> SELECT property_name, property_value
  2  FROM   database_properties
  3  WHERE  property_name = 'LOCAL_UNDO_ENABLED';

PROPERTY_NAME                  PROPERTY_VALUE
------------------------------ ------------------------------
LOCAL_UNDO_ENABLED             TRUE

SQL> SELECT log_mode FROM   v$database;

LOG_MODE
------------
ARCHIVELOG

5.在本地CDB执行下面的语句来克隆可刷新的PDB

SQL> create pluggable database jypdb from jypdb@jycdb relocate availability max;

Pluggable database created.
SQL> select name,open_mode from v$pdbs;

NAME                                                                                                                             OPEN_MODE
-------------------------------------------------------------------------------------------------------------------------------- ----------
PDB$SEED                                                                                                                         READ ONLY
JYPDB                                                                                                                            READ WRITE

以read write方式来打开PDB以完成迁移操作

SQL> alter pluggable database jypdb open;

Pluggable database altered.

SQL> alter session set container=jypdb;

Session altered.

SQL> set long 200
SQL> set linesize 200
SQL> select name,open_mode from v$pdbs;

NAME                                                                                                                             OPEN_MODE
-------------------------------------------------------------------------------------------------------------------------------- ----------
JYPDB                                                                                                                            READ WRITE

删除公共dblink

SQL> drop public database link jycdb;

Database link dropped.

检查远程PDB可以看到已经被删除了

SQL> alter session set container=jypdb;

Session altered.

SQL> select name,open_mode from v$pdbs;

no rows selected

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