利用copy在ASM磁盘组之间迁移

从+DISK迁移到+DG1磁盘组

一.复制数据库文件到ASM磁盘组
1.启动到mount状态(启动第一节点数据库到mount,其它节点数据库实例关闭)
SQL> startup mount;

2.利用copy备份数据库
rman>backup as copy database format '+DG1'


3.利用rman工具指定到新的路径
RMAN> switch database to copy;


4.更新控制文件的数据文件路径
RMAN>run{
switch datafile all;
}


5.recover database并打开数据库
run
{
recover database;
alter database open;
}


6.添加新的临时文件到新的磁盘组，删除老的临时文件


SQL> alter tablespace temp add tempfile '+DG1' size 10m autoextend on;   
SQL> select file#, TS#,name from v$tempfile;
 
SQL> ALTER DATABASE TEMPFILE  '+DATA/orcl/tempfile/temp.854.822754095' DROP INCLUDING DATAFILES;        


 
7.重建在线redo到新的磁盘组和删除旧的在线redo
SQL>select GROUP#, THREAD#,STATUS,members from v$log;
 
更改第一节点的联机日志文件组
sql>alter database add logfile group 5 +dg1 size 50m;
sql>alter database add logfile group 6 +dg1 size 50m;

sql>alter system switch logfile;
sql>alter system switch logfile;
sql>alter system checkpoint;
sql>alter database drop logfile group 1;
sql>alter database drop logfile group 2;

更改第二节点的联机日志文件组(启动第二节点数据库)

SQL> alter database add logfile thread 2 group 7 '+DG1' size 50m; 
SQL> alter database add logfile thread 2 group 8 '+DG1' size 50m;
sql>alter system switch logfile;
sql>alter system switch logfile;
sql>alter system checkpoint;
SQL> alter database drop logfile group 3;
SQL> alter database drop logfile group 4;

二,修改控制文件的路径

1.修改控制文件的路径
sql>alter system set control_files='+dg1' scope=spfile;
2.备份控制文件
$rman target /

rman>backup current controlfile format '/home/oracle/controlfile.ctl'；

修改新的控制文件的路径
alter system set control_files='+DG1/mydb/controlfile/current.265.881774751' scope=spfile;


3.启动数据库到NOMOUNT
rman>shutdown immediate
rman>startup nomount;
4.恢复控制文件
rman>restore controlfile from '/home/oracle/controlfile.ctl';


5.修改新的控制文件的路径
alter system set control_files='+DG1/mydb/controlfile/current.265.881774751' scope=spfile;

备注：需要修改spfile文件中控制文件恢复新的路径,要不然数据库启动的时候会出现找不到控制文件的问题


三.将spfile指定到新的asm组
1.创建创建pfile
create pfile='/home/oracle/init.ora' from spfile;


修改以下参数
db_create_file_dest='+DISK' 修改为db_create_file_dest='+DG1'
log_archive_dest_1='LOCATION=+DISK' 修改为log_archive_dest_1='LOCATION=+DG1'




2.修改init.ora,每一个节点都需要修改
[oracle@db1 ~]$ cd $ORACLE_HOME/dbs
[oracle@db1 dbs]$ vi initmydb1.ora
SPFILE='+DG1/mydb/spfilemydb.ora'


3.创建spfile文件

create SPFILE='+DG1/mydb/spfilemydb.ora' from  pfile='/home/oracle/init.ora'

四.启动数据库

oracle@db1 dbs]$ rman target /

RMAN> recover database;   --------------》因为控制文件是通过rman恢复回来的，需要recover database
RMAN> alter database open resetlogs;

SQL> select * from v$dbfile

     FILE# NAME
---------- --------------------------------------------------
         5 +DG1/mydb/datafile/undotbs2.258.881772827
         4 +DG1/mydb/datafile/users.256.881772841
         3 +DG1/mydb/datafile/undotbs1.261.881772821
         2 +DG1/mydb/datafile/sysaux.259.881772773
         1 +DG1/mydb/datafile/system.260.881772719

SQL> select member from v$logfile;


MEMBER
--------------------------------------------------------------------------------
+DG1/mydb/onlinelog/group_3.267.881774255
+DG1/mydb/onlinelog/group_4.268.881774353
+DISK/mydb/onlinelog/group_2.267.881719891
+DG1/mydb/onlinelog/group_1.266.881774153

SQL> select name from v$tempfile;


NAME
--------------------------------------------------
+DG1/mydb/tempfile/temp.264.881773741

整个迁移过程完成