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番外:如何克隆可刷新的PDB

时间:2019-08-31 10:33:16      阅读:111      评论:0      收藏:0      [点我收藏+]

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基于版本:19c (12.2.0.3) AskScuti

创建方法:克隆创建

对应路径:属于克隆。PDB类型为:Refreshable

相关系列请参考《Oracle创建PDB列表文章

注意创建可刷新的PDB,源库必须处于归档模式和本地UNDO模式

 

内容总览 

1. 环境概述

2. 检查源库环境

3. 源库创建用户并授权

4. 目标库编辑TNS

5. 目标库创建DBLink

6. 目标库创建可刷新PDB

7. 目标库打开可刷新PDB

8. 可刷新PDB测试

 

1. 环境概述

为了概念理解统一,提前约定下:

远程CDB2中有个ERP1,我们称远程CDB2为“源CDB”,IP:192.168.1.14

本地CDB1中有个PDB1,我们称本地CDB1为“目标CDB”,IP:192.168.1.12

注意:源CDB和目标CDB是相对而言。就是被克隆的对象叫“”,准备克隆出来的对象叫“目标”。因此,下面就是要通过源CDB2中的ERP1,远程克隆出来一个可刷新的PDB,放在目标CDB1中,名称为PDB_REF。

 

2. 检查源库环境

检查是否为归档模式

[oracle@henry ~]$ rlwrap sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Sat Aug 31 07:27:48 2019
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle.  All rights reserved.

Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0

SQL> show pdbs

    CON_ID CON_NAME  OPEN MODE  RESTRICTED
---------- --------- ---------- ----------
     2 PDB$SEED      READ ONLY  NO
     3 ERP1          READ WRITE NO
SQL> archive log list;
Database log mode             Archive Mode
Automatic archival             Enabled
Archive destination           /u01/app/oracle/arch1
Oldest online log sequence     5
Next log sequence to archive   7
Current log sequence           7

 

检查是否为本地UNDO

SQL> select property_name,property_value from database_properties where property_name=LOCAL_UNDO_ENABLED;

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

 

3. 源库创建用户并授权

SQL> create user c##u1 identified by oracle;

User created.

SQL> grant create session,create pluggable database,sysoper to c##u1 container=all;

Grant succeeded.

 

4. 目标库编辑TNS

CDB2 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.14)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = CDB2)
    )
  )

目标库编辑tnsnames别名,指向源库。

 

5. 目标库创建DBLink

SQL> create database link cdb2_dblink connect to c##u1 identified by oracle using CDB2;

Database link created.

#测试DBLINK

SQL> select * from tab@cdb2_dblink;

no rows selected

 

6. 目标库创建可刷新PDB

注意:刷新模式子句只支持 CREATE PLUGGABLE DATABASE ... FROM 语句。

6.0 基于默认 REFRESH MODE NONE

默认缺省情况下,创建普通PDB(非刷新PDB)

 

6.1 基于手工刷新 REFRESH MODE MANUAL

SQL> !mkdir /u01/app/oracle/oradata/CDB1/pdbref

SQL> create pluggable database pdb_ref from erp1@cdb2_dblink create_file_dest=/u01/app/oracle/oradata/CDB1/pdbref refresh mode manual;

 

6.2 基于自动刷新 REFRESH MODE EVERY number_of_minutes MINUTES

SQL> !mkdir /u01/app/oracle/oradata/CDB1/pdbrefauto

SQL> create pluggable database pdb_refauto from erp1@cdb2_dblink create_file_dest=/u01/app/oracle/oradata/CDB1/pdbrefauto refresh mode every 60 minutes;

 

查看

SQL> show pdbs

    CON_ID CON_NAME  OPEN MODE  RESTRICTED
---------- --------- ---------- ----------
     2 PDB$SEED      READ ONLY  NO
     3 PDB1          MOUNTED
     4 PDB_REF       MOUNTED
     5 PDB_REFAUTO   MOUNTED

 

7. 目标库打开可刷新PDB

可刷新PDB为了保证和源库一致,必须只能以 READ ONLY 只读模式打开。

SQL> alter pluggable database pdb_ref open read only;

Pluggable database altered.

SQL> show pdbs

    CON_ID CON_NAME  OPEN MODE  RESTRICTED
---------- --------- ---------- ----------
     2 PDB$SEED      READ ONLY  NO
     3 PDB1          MOUNTED
     4 PDB_REF       READ ONLY  NO
     5 PDB_REFAUTO   MOUNTED

无法以读写模式打开

SQL> alter pluggable database pdb_ref open;
alter pluggable database pdb_ref open
*
ERROR at line 1:
ORA-65341: cannot open pluggable database in read/write mode

 

8. 可刷新PDB测试

8.1 源库创建测试数据

SQL> show pdbs

    CON_ID CON_NAME  OPEN MODE  RESTRICTED
---------- --------- ---------- ----------
     2 PDB$SEED      READ ONLY  NO
     3 ERP1          READ WRITE NO
SQL> alter session set container=erp1;

Session altered.

SQL> create table test_ref(id number);

Table created.

SQL> insert into test_ref select object_id from dba_objects where rownum<501;

500 rows created.

SQL> commit;

Commit complete.

SQL> select count(*) from test_ref;

  COUNT(*)
----------
       500

 

8.2 目标库刷新

刷新前查看

SQL> show pdbs

    CON_ID CON_NAME  OPEN MODE  RESTRICTED
---------- --------- ---------- ----------
     2 PDB$SEED      READ ONLY  NO
     3 PDB1          MOUNTED
     4 PDB_REF       READ ONLY  NO
     5 PDB_REFAUTO   MOUNTED
SQL> alter session set container=pdb_ref;

Session altered.

SQL> select count(*) from test_ref;
select count(*) from test_ref
                     *
ERROR at line 1:
ORA-00942: table or view does not exist

 

目标库关闭PDB_REF进行手工刷新

注意:执行刷新时,必须关闭可刷新的PDB。如果尝试自动刷新时未关闭可刷新的PDB,则将刷新延迟到下一次计划。如果执行手动刷新时未关闭可刷新的PDB,则会报告错误。自动刷新模式的PDB也可以执行手工刷新。

SQL> show pdbs

    CON_ID CON_NAME  OPEN MODE  RESTRICTED
---------- --------- ---------- ----------
     4 PDB_REF       READ ONLY  NO

SQL
> alter pluggable database pdb_ref close immediate; Pluggable database altered. SQL> show pdbs CON_ID CON_NAME OPEN MODE RESTRICTED ---------- --------- ---------- ---------- 4 PDB_REF MOUNTED
SQL
> alter pluggable database pdb_ref refresh; Pluggable database altered.

 

8.3 目标库刷新后查看

SQL> alter pluggable database pdb_ref open read only;

Pluggable database altered.

SQL> show pdbs

    CON_ID CON_NAME  OPEN MODE  RESTRICTED
---------- --------- ---------- ----------
     4 PDB_REF       READ ONLY  NO

SQL> select count(*) from test_ref;

  COUNT(*)
----------
       500

番外:如何克隆可刷新的PDB

标签:select   默认   selected   color   lis   add   tar   ror   pen   

原文地址:https://www.cnblogs.com/askscuti/p/11432578.html

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