一、ASM磁盘和磁盘组管理

1、创建磁盘组

create diskgroup DG2 EXTERNAL REDUNDANCY DISK ‘ORCL:A1′;

Note:1)磁盘名称需要大写

2)磁盘名称使用V$asm_disk.path

2、磁盘组中添加磁盘

alter diskgroup dg2 add disk ‘ORCL:A2′;

Note:磁盘名称使用V$asm_disk.path

3、磁盘组中删除磁盘

alter diskgroup dg2 drop disk ‘a1′;

Note:磁盘名称使用的是V$asm_disk.name

4、删除磁盘组

drop diskgroup dg2 including contents;

二、ASM相关视图

1、查看是否有数据库实例连接上ASM实例

select instance_name,db_name,status from v$asm_client;

2、记录BALANCE操作

select operation,state,power,actual,sofar from v$asm_operation;

3、ASM DISK信息

select path, state, total_mb, free_mb from v$asm_disk;

4、ASM DISKGROUP信息

select name,state,type,total_mb,free_mb from v$asm_diskgroup;

三、ASM和表空间管理

1、ASM中创建表空间

create tablespace xff datafile ‘+DG2′ SIZE 100M;

2、ASM表空间中添加数据文件

alter tablespace xff add datafile ‘+dg2′ size 10m;

3、ASM表空间中删除数据文件

alter tablespace xff drop datafile ‘+DG2/xff/datafile/xff.257.747278679′;

或者

alter tablespace xff drop datafile 7;

4、删除表空间

drop tablespace xff including contents;

ASM简单管理(2)

oracle之datafile，tablespace

undo异常处理步骤（10g）

undo损坏恢复–无事务

asm备份元数据之md_backup和md_restore

数据文件重命名

undo损坏恢复–有事务

ORACLE在线切换undo表空间

-------------------------------

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

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ASM简单管理

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