1、磁盘组卸载/挂载
--查看当前磁盘组状态
SQL> select group_number,name,state,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB FREE_MB
------------ -------------------- ---------------------- ---------- ----------
1 ARCHIVELOG MOUNTED 12637 12585
2 DATA MOUNTED 10228 7644
3 FLASHBACK MOUNTED 7836 7786
4 DG2 MOUNTED 5114 5012
--卸载dg2磁盘组
SQL> alter diskgroup dg2 dismount;
Diskgroup altered.
SQL> select group_number,name,state,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB FREE_MB
------------ -------------------- ---------------------- ---------- ----------
1 ARCHIVELOG MOUNTED 12637 12585
2 DATA MOUNTED 10228 7644
3 FLASHBACK MOUNTED 7836 7786
0 DG2 DISMOUNTED 0 0
--挂载dg2磁盘组
SQL> alter diskgroup dg2 mount;
Diskgroup altered.
SQL> select group_number,name,state,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB FREE_MB
------------ -------------------- ---------------------- ---------- ----------
1 ARCHIVELOG MOUNTED 12637 12585
2 DATA MOUNTED 10228 7644
3 FLASHBACK MOUNTED 7836 7786
4 DG2 MOUNTED 5114 5012
--卸载所有磁盘组
SQL> alter diskgroup all dismount;
Diskgroup altered.
SQL> select group_number,name,state,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB FREE_MB
------------ -------------------- ---------------------- ---------- ----------
0 DATA DISMOUNTED 0 0
0 DG2 DISMOUNTED 0 0
0 FLASHBACK DISMOUNTED 0 0
0 ARCHIVELOG DISMOUNTED 0 0
--挂载所有磁盘组
SQL> alter diskgroup all mount;
Diskgroup altered.
SQL> select group_number,name,state,total_mb,free_mb from v$asm_diskgroup;
GROUP_NUMBER NAME STATE TOTAL_MB FREE_MB
------------ -------------------- ---------------------- ---------- ----------
2 DATA MOUNTED 10228 7644
3 DG2 MOUNTED 5114 5012
4 FLASHBACK MOUNTED 7836 7786
1 ARCHIVELOG MOUNTED 12637 12585
--如果当前磁盘组有实例在访问，则不能被卸载
SQL> alter diskgroup data dismount;
alter diskgroup data dismount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15027: active use of diskgroup "DATA" precludes its dismount
2、磁盘组目录
--创建目录
SQL> alter diskgroup dg2 add directory '+DG2/CHENGFEI';
Diskgroup altered.
--使用asmcmd查看（export ORACLE_SID=+ASM;asmcmd进入)
ASMCMD> pwd
+DG2
ASMCMD> ls -l
Type Redund Striped Time Sys Name
N CHENGFEI/
--目录重命名
SQL> alter diskgroup dg2 rename directory '+DG2/CHENGFEI' TO '+DG2/XIFENFEI';
Diskgroup altered.
ASMCMD> ls
XIFENFEI/
--删除目录
SQL> alter diskgroup dg2 drop directory '+DG2/xifenfei';
Diskgroup altered.
ASMCMD> ls
ASMCMD>
3、文件别名
--添加别名
SQL> alter diskgroup dg2 add alias '+dg2/XIFENFEI' for '+dg2/tasm/datafile/XFF.256.754832383';
Diskgroup altered.
--使用asmcmd查看别名是否成功
ASMCMD> pwd
+dg2
ASMCMD> ls -l
Type Redund Striped Time Sys Name
Y TASM/
N XIFENFEI => +DG2/TASM/DATAFILE/XFF.256.754832383
--别名重命名
SQL> alter diskgroup dg2 rename alias '+DG2/XIFENFEI' TO '+DG2/FEIFEI.DBF';
Diskgroup altered.
N XIFENFEI => +DG2/TASM/DATAFILE/XFF.256.754832383
ASMCMD> ls -l
Type Redund Striped Time Sys Name
N FEIFEI.DBF => +DG2/TASM/DATAFILE/XFF.256.754832383
Y TASM/
--删除别名
SQL> alter diskgroup dg2 drop alias '+dg2/feifei.dbf';
Diskgroup altered.
ASMCMD> ls -l
Type Redund Striped Time Sys Name
Y TASM/
说明：
1）asmcmd命令行操作中，目录文件名不区分大小写，命令关键字区分大小写
2）磁盘组中的一个文件，最多只能建立一个别名可以通过v$asm_alias视图查看别名的相关信息
oracle视频教程请关注:http://u.youku.com/user_video/id_UMzAzMjkxMjE2.html
