Oracle hot clone 12.2

Posted 2020-11-03

以下两种clone都是从12.2 to 12.2

1 克隆pdb到当前cdb里：

cdb下执行：

alter session set pdb_file_name_convert=‘aaa‘,‘bbb‘;
create pluggable database bbb from aaa;
alter pluggable database bbb open instances=all;

给pdb bbb srvctl add service ,同时启动service

2 远程克隆pdb

这里就要说一个热克隆对应的参数：

    UNDO模式

undo 在12C R1版本中只支持Global Shared Undo模式, 所有container共享一个UNDO表空间, 目前保留这种模式只是为了升级过渡, 在12C R2引入了PDB Local UNDO模式,每个container都有自己的UNDO 表空间, 对于RAC是每个实例每个container都有自己的UNDO表空间, 这也正是推荐的. 无论是Shared undo还是Local undo模式,都是CDB的属性,所以在修改时当前的container都要在cdb$root下. 12.2只要配置了LOCAL undo才支持下面的新特性:Hot Clone, Refresh PDB, PDB Relocate, Flashback PDB

select * from database_properties where property_name=‘LOCAL_UNDO_ENABLED‘;

修改此参数：

startup upgrade
alter session set container=cdb$root;
ALTER DATABASE LOCAL UNDO ON(off);
shutdown immediate;
startup
-- When a CDB is changed from shared undo mode to local undo mode,
-- Oracle Database creates the required undo tablespaces automatically.
alter pluggable database xxx open instances=all;

create user aaa identified by <password> container=all;
grant sysoper to aaa container=all;
create public database link lych_clone connect to aaa
identified by aa using ‘<tns>‘;
---这个TNS经测试不管是连接cdb的TNS还是连接PDB的TNS都可以实现克隆

     CREATE PLUGGABLE DATABASE bbb FROM [email protected]_clone;

     针对克隆后台的PDB进行open,同时要给克隆后的pdb新建service。