本篇内容主要讲解“Oracle 11.2.0.3管理ASM的方法是什么”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Oracle 11.2.0.3管理ASM的方法是什么”吧!

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一：查看ASM磁盘及磁盘组状态
SQL> select * from v$asm_disk;
SQL> select * from v$asm_diskgroup;

二：创建external 冗余磁盘组,添加，删除磁盘，删除磁盘的时候需要指定磁盘的name而不是path

   SQL> create diskgroup FRA external redundancy disk '/dev/asm-disk4'; 
    Diskgroup created. 
    
    SQL> alter diskgroup fra add disk '/dev/asm-disk5' rebalance power 10; 
    Diskgroup altered. 
    
    SQL> select name,failgroup,path from v$asm_disk; 
    
    NAME                 FAILGROUP            PATH 
    -------------------- -------------------- -------------------- 
    DATA_0000            DATA_0000            /dev/asm-disk1 
    DATA_0001            DATA_0001            /dev/asm-disk3 
    DATA_0002            DATA_0002            /dev/asm-disk2 
    FRA_0000             FRA_0000             /dev/asm-disk4 
    FRA_0001             FRA_0001             /dev/asm-disk5 
                                              /dev/asm-disk6 
                                              /dev/asm-disk7 
    
    SQL> alter diskgroup fra drop disk '/dev/asm-disk4' rebalance power 10; 
    alter diskgroup fra drop disk '/dev/asm-disk4' rebalance power 10 
    * 
    ERROR at line 1: 
    ORA-15032: not all alterations performed 
    ORA-15054: disk "/DEV/ASM-DISK4" does not exist in diskgroup "FRA" 
    
    SQL> alter diskgroup fra drop disk 'FRA_0000' rebalance power 10; 
    Diskgroup altered.

三：创建normal redundancy磁盘组

    SQL> conn /as sysasm 
    Connected. 
    SQL> create diskgroup fra normal redundancy  
         failgroup fg1 disk '/dev/asm-disk4','/dev/asm-disk5' 
         failgroup fg2 disk '/dev/asm-disk6','/dev/asm-disk7' 
         attribute 'compatible.rdbms'='11.2','compatible.asm'='11.2'; 
    Diskgroup created. 
    
    SQL> select name, total_mb,free_mb,required_mirror_free_mb,usable_file_mb from v$asm_diskgroup; 
    
    NAME         TOTAL_MB    FREE_MB REQUIRED_MIRROR_FREE_MB USABLE_FILE_MB 
    ---------- ---------- ---------- ----------------------- -------------- 
    DATA            61440      54873                       0          18291 
    FRA             81920      81592                   20480          30556

四：failgroup测试；FAILGROUP是用于将磁盘分组，以保证丢失任何一组FAILGROUP磁盘，数据还是完整的,多用于多阵列，通过ASM来完成冗余的环境！
1：查看FRA磁盘组中failgroup信息及磁盘状态

    SQL> select name,path,failgroup,mount_status from v$asm_disk where group_number=2; 
    
    NAME                 PATH                 FAILGROUP  MOUNT_STATUS 
    -------------------- -------------------- ---------- --------------------- 
    FRA_0003             /dev/asm-disk7       FG2        CACHED 
    FRA_0002             /dev/asm-disk6       FG2        CACHED 
    FRA_0000             /dev/asm-disk4       FG1        CACHED 
    FRA_0001             /dev/asm-disk5       FG1        CACHED

2：在rdbms实例中创建表空间，建表并插入数据，收集表统计信息

    SQL> create tablespace test01 datafile '+FRA'; 
    Tablespace created. 
    
    ASMCMD> pwd 
    +fra/db/datafile 
    ASMCMD> ls 
    TEST01.256.800622493 
    
    SQL> create table t1 tablespace test01 as select * from dba_objects; 
    Table created. 
    
    SQL> exec dbms_stats.gather_table_stats('SYS','T1'); 
    PL/SQL procedure successfully completed. 
    
    SQL> select count(*) from t1; 
    
      COUNT(*) 
    ---------- 
         74501

3：删除udev相关规则，重启数据库实例和ASM实例，验证数据是否存在

    SQL> conn /as sysasm 
    Connected. 
    SQL> alter diskgroup fra mount; 
    alter diskgroup fra mount 
    * 
    ERROR at line 1: 
    ORA-15032: not all alterations performed 
    ORA-15040: diskgroup is incomplete 
    ORA-15042: ASM disk "1" is missing from group number "2" 
    ORA-15042: ASM disk "0" is missing from group number "2" 
    
    SQL> alter diskgroup fra mount force; 
    Diskgroup altered. 
    
    SQL> select name,path,failgroup,mount_status from v$asm_disk; 
    
    NAME       PATH                 FAILGROUP            MOUNT_STATUS 
    ---------- -------------------- -------------------- --------------------- 
    FRA_0000                        FG1                  MISSING 
    FRA_0001                        FG1                  MISSING 
    FRA_0002   /dev/asm-disk6       FG2                  CACHED 
    FRA_0003   /dev/asm-disk7       FG2                  CACHED 
    DATA_0000  /dev/asm-disk1       DATA_0000            CACHED 
    DATA_0002  /dev/asm-disk2       DATA_0002            CACHED 
    DATA_0001  /dev/asm-disk3       DATA_0001            CACHED 
    7 rows selected. 
    
    SQL> conn /as sysdba 
    Connected. 
    SQL> select count(*) from t1; 
    
      COUNT(*) 
    ---------- 
         74501

五：删除ASM磁盘组，默认磁盘故障条件下，经过12960秒即3.6个小时后自动删除；删除磁盘组之前需要保证无数据存放在磁盘组上且无到该磁盘组的active连接

    [grid@localhost ~]$ tail -f /u01/app/grid/diag/asm/+asm/+ASM/trace/alert_+ASM.log  
    ORA-15062: ASM disk is globally closed 
    Thu Nov 29 12:00:53 2012 
    WARNING: Disk 0 (FRA_0000) in group 2 will be dropped in: (12960) secs on ASM inst 1 
    WARNING: Disk 1 (FRA_0001) in group 2 will be dropped in: (12960) secs on ASM inst 1 
    Thu Nov 29 12:00:58 2012 
    
    asm实例： 
    SQL> select path,name,repair_timer from v$asm_disk where group_number=2; 
    
    PATH                 NAME       REPAIR_TIMER 
    -------------------- ---------- ------------ 
                         FRA_0000          12960 
                         FRA_0001          12960 
    /dev/asm-disk6       FRA_0002              0 
    /dev/asm-disk7       FRA_0003              0 
    
    SQL> alter diskgroup fra online disk 'FRA_0000'; 
    Diskgroup altered. 
    
    SQL> alter diskgroup fra online disk 'FRA_0001'; 
    Diskgroup altered. 
    
    SQL> select name,path,failgroup,mount_status from v$asm_disk; 
    
    NAME       PATH                 FAILGROUP            MOUNT_STATUS 
    ---------- -------------------- -------------------- --------------------- 
    FRA_0002   /dev/asm-disk6       FG2                  CACHED 
    FRA_0003   /dev/asm-disk7       FG2                  CACHED 
    DATA_0000  /dev/asm-disk1       DATA_0000            CACHED 
    DATA_0002  /dev/asm-disk2       DATA_0002            CACHED 
    DATA_0001  /dev/asm-disk3       DATA_0001            CACHED 
    FRA_0001   /dev/asm-disk5       FG1                  CACHED 
    FRA_0000   /dev/asm-disk4       FG1                  CACHED 
    
    SQL> drop diskgroup fra; 
    drop diskgroup fra 
    * 
    ERROR at line 1: 
    ORA-15039: diskgroup not dropped 
    ORA-15053: diskgroup "FRA" contains existing files 
    
    rdbms实例： 
    SQL> drop tablespace test01 including contents; 
    Tablespace dropped. 
    
    SQL> shutdown immediate 
    Database closed. 
    Database dismounted. 
    ORACLE instance shut down. 
    
    asm实例： 
    SQL> drop diskgroup fra including contents; 
    Diskgroup dropped. 
    
    rdbms实例： 
    SQL> startup 
    ORACLE instance started. 
    
    Total System Global Area  313860096 bytes 
    Fixed Size                  1344652 bytes 
    Variable Size             192940916 bytes 
    Database Buffers          113246208 bytes 
    Redo Buffers                6328320 bytes 
    Database mounted. 
    Database opened. 

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