1 系统环境需求
1.1 安装前的系统环境准备
- 检查Solaris服务器安装完成并打上最新的补丁集
- 网络环境连通并调试正常。
- 磁盘阵列安装完成并按ORACLE系统进行磁盘划分。
1.2 硬件要求
- 内存:> 2G。
- SWAP区:2G。通常等于物理内存,最低不少于1G。
- 硬盘容量:数据库软件 > 4G。数据库 > 2G。
- /tmp:临时目录空间大于500M。
1.3 软件要求
- 操作系统及Patches:
Solaris 10补丁
SUNWarc SUNWbtool SUNWhea SUNWlibC SUNWlibm SUNWlibms SUNWmfrun SUNWsprot SUNWtoo SUNWi1of SUNWi1cs SUNWi15cs SUNWxwfnt SUNWcsl SUNWxcu4
2 准备工作
2.1 检查操作系统运行环境
- 检查是否包含所需Patch。命令:
pkginfo -i SUNWarc SUNWbtool SUNWhea SUNWlibC SUNWlibm SUNWlibms SUNWmfrun SUNWsprot SUNWtoo SUNWi1of SUNWi1cs SUNWi15cs SUNWxwfnt SUNWcsl SUNWxcu4
- 检查操作系统的版本
# uname -r
- 检查实际可用内存,命令:
# /usr/sbin/prtconf | grep "Memory size"
- 检查交换区大小。命令:
# /usr/sbin/swap -s
- 检查文件系统可用空间和临时目录/tmp可用空间。命令:
# df -h /tmp
# df -h
- 检查操作系统内核架构
# /bin/isainfo -kv
- 检查网络
# hostname
# ifconfig –a
# ping
服务器的hosts文件内容:
#public IP
172.16.10.1 BXDB1
172.16.10.2 BXDB2
#private IP
172.16.1.3 BXDB1-priv
172.16.1.4 BXDB2-priv
#VIP
172.16.10.7 BXDB1-vip
172.16.10.8 BXDB2-vip
#SCAN
172.16.10.9 BXDB-scan
- 检查节点时间保证同步
# date
2.2 用户的准备工作(BXDB1和BXDB2相同)
- 修改UDP参数
$ vi /etc/rc2.d/S99ndd
添加
ndd -set /dev/udp udp_xmit_hiwat 65536
ndd -set /dev/udp udp_recv_hiwat 65536
- 建立所需的组
/usr/sbin/groupadd -g 1000 oinstall
/usr/sbin/groupadd -g 1100 asmadmin
/usr/sbin/groupadd -g 1200 dba
/usr/sbin/groupadd -g 1201 oper
/usr/sbin/groupadd -g 1300 asmdba
/usr/sbin/groupadd -g 1301 asmoper
- 建立所需的用户
# mkdir -p /export/home/grid
# useradd -u 1100 -g oinstall -G dba,asmadmin,asmdba,asmoper -d /export/home/grid -s /usr/bin/bash grid
# mkdir -p /export/home/oracle
# useradd -u 1101 -g oinstall -G asmdba,dba,oper -d /export/home/oracle -s /usr/bin/bash oracle
修改新建用户的密码 密码1qaz.oracle
# passwd grid
# passwd oracle
- 修改环境变量
Grid用户
# su – grid
$ vi .profile
添加
# ORACLE_SID (节点2上要写ORACLE_SID=+ASM2)
ORACLE_SID=+ASM1; export ORACLE_SID
ORACLE_BASE=/oracle/app/grid; export ORACLE_BASE
ORACLE_HOME=/oracle/app/11.2.0/grid; export ORACLE_HOME
PATH=.:${JAVA_HOME}/bin:${PATH}:$HOME/bin:$ORACLE_HOME/bin
PATH=${PATH}:/usr/bin:/bin:/usr/bin/X11:/usr/local/bin
export PATH
NLS_LANG=AMERICAN_AMERICA.UTF8;export NLS_LANG
umask 022
oracle用户
# su – oracle
$ vi .profile
添加
# ORACLE_SID (节点2上要写ORACLE_SID=boss2)
ORACLE_SID=boss1; export ORACLE_SID
ORACLE_BASE=/oracle/app/oracle; export ORACLE_BASE
ORACLE_HOME=/oracle/app/oracle/product/11.2.0/dbhome_1; export ORACLE_HOME
PATH=.:${JAVA_HOME}/bin:${PATH}:$HOME/bin:$ORACLE_HOME/bin
PATH=${PATH}:/usr/bin:/bin:/usr/bin/X11:/usr/local/bin
export PATH
NLS_LANG=AMERICAN_AMERICA.UTF8;export NLS_LANG
umask 022
- 修改系统参数(root用户)
# vi /etc/system
添加
set noexec_user_stack=1
set semsys:seminfo_semmni=100
set semsys:seminfo_semmns=1024
set semsys:seminfo_semmsl=256
set semsys:seminfo_semvmx=23767
set shmsys:shminfo_shmmax=107374182400
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmmni=100
set shmsys:shminfo_shmset=10
执行
# projmod -sK "project.max-shm-memory=(privileged,100G,deny)" default
重启服务器
- 配置等效性
以下是grid用户,oracle用户配置方式一样
$ chmod 755 /export/home (该目录权限必须是755)
◆以下两个RAC节点都执行
-bash-3.00$ mkdir -p ~/.ssh
-bash-3.00$ chmod 700 ~/.ssh
-bash-3.00$ /usr/bin/ssh-keygen -t rsa
提示输入输入密码时,保持为空回车即可,使用空密码操作简单一些。
◆以下只在RAC节点1执行
-bash-3.00$ touch ~/.ssh/authorized_keys
-bash-3.00$ ssh BXDB1 cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
-bash-3.00$ ssh BXDB2 cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
-bash-3.00$ scp ~/.ssh/authorized_keys BXDB2:.ssh/authorized_keys
◆以下两个RAC节点都执行
-bash-3.00$ chmod 600 ~/.ssh/authorized_keys
测试等效性,不提示输入密码即配置成功(第一次要求输入密码是正常的)
ssh BXDB1 "date;hostname"
ssh BXDB2 "date;hostname"
- 配置裸盘(root用户)
# format
AVAILABLE DISK SELECTIONS:
0. c0t5000CCA03C70E8B4d0 <HITACHI-H106030SDSUN300G-A2B0 cyl 46873 alt 2 hd 20 sec 625> solaris
scsi_vhci/disk@g5000cca03c70e8b4
1. c0t5000CCA03C709A38d0 <HITACHI-H106030SDSUN300G-A2B0 cyl 46873 alt 2 hd 20 sec 625> solaris
scsi_vhci/disk@g5000cca03c709a38
2. c0t600000E00D11000000111430000D0000d0 <FUJITSU-ETERNUS_DXL-0000 cyl 254 alt 2 hd 64 sec 256>
scsi_vhci/ssd@g600000e00d11000000111430000d0000
3. c0t600000E00D1100000011143000040000d0 <FUJITSU-ETERNUS_DXL-0000-409.00GB>
scsi_vhci/ssd@g600000e00d1100000011143000040000
4. c0t600000E00D1100000011143000060000d0 <FUJITSU-ETERNUS_DXL-0000-409.00GB>
scsi_vhci/ssd@g600000e00d1100000011143000060000
5. c0t600000E00D1100000011143000070000d0 <FUJITSU-ETERNUS_DXL-0000-409.00GB>
scsi_vhci/ssd@g600000e00d1100000011143000070000
6. c0t600000E00D1100000011143000050000d0 <FUJITSU-ETERNUS_DXL-0000-409.00GB>
scsi_vhci/ssd@g600000e00d1100000011143000050000
7. c0t600000E00D1100000011143000030000d0 <FUJITSU-ETERNUS_DXL-0000 cyl 58878 alt 2 hd 128 sec 256>
scsi_vhci/ssd@g600000e00d1100000011143000030000
8. c0t600000E00D1100000011143000020000d0 <FUJITSU-ETERNUS_DXL-0000 cyl 58878 alt 2 hd 128 sec 256>
scsi_vhci/ssd@g600000e00d1100000011143000020000
9. c0t600000E00D1100000011143000010000d0 <FUJITSU-ETERNUS_DXL-0000 cyl 58878 alt 2 hd 128 sec 256>
scsi_vhci/ssd@g600000e00d1100000011143000010000
10. c0t600000E00D1100000011143000000000d0 <FUJITSU-ETERNUS_DXL-0000 cyl 58878 alt 2 hd 128 sec 256>
scsi_vhci/ssd@g600000e00d1100000011143000000000
Specify disk (enter its number)[7]: 2
selecting c0t600000E00D11000000111430000D0000d0
[disk formatted]
format> p
PARTITION MENU:
0 - change `0' partition
1 - change `1' partition
2 - change `2' partition
3 - change `3' partition
4 - change `4' partition
5 - change `5' partition
6 - change `6' partition
7 - change `7' partition
select - select a predefined table
modify - modify a predefined partition table
name - name the current table
print - display the current table
label - write partition map and label to the disk
!<cmd> - execute <cmd>, then return
quit
partition> 0
Part Tag Flag Cylinders Size Blocks
0 root wm 0 0 (0/0/0) 0
Enter partition id tag[root]:
Enter partition permission flags[wm]:
Enter new starting cyl[0]:
Enter partition size[0b, 0c, 0e, 0.00mb, 0.00gb]:
partition> p
Current partition table (unnamed):
Total disk cylinders available: 254 + 2 (reserved cylinders)
Part Tag Flag Cylinders Size Blocks
0 unassigned wm 0 0 (0/0/0) 0
1 swap wu 0 0 (0/0/0) 0
2 backup wu 0 - 253 1.98GB (254/0/0) 4161536
3 unassigned wm 0 0 (0/0/0) 0
4 unassigned wm 0 0 (0/0/0) 0
5 unassigned wm 0 0 (0/0/0) 0
6 usr wm 0 - 253 1.98GB (254/0/0) 4161536
7 unassigned wm 0 0 (0/0/0) 0
partition> 6
Part Tag Flag Cylinders Size Blocks
6 usr wm 0 - 253 1.98GB (254/0/0) 4161536
Enter partition id tag[usr]:
Enter partition permission flags[wm]:
Enter new starting cyl[0]: 3
Enter partition size[4112384b, 251c, 253e, 2008.00mb, 1.96gb]:
partition> label
Ready to label disk, continue? y
partition> p
Current partition table (unnamed):
Total disk cylinders available: 254 + 2 (reserved cylinders)
Part Tag Flag Cylinders Size Blocks
0 unassigned wm 0 0 (0/0/0) 0
1 swap wu 0 0 (0/0/0) 0
2 backup wu 0 - 253 1.98GB (254/0/0) 4161536
3 unassigned wm 0 0 (0/0/0) 0
4 unassigned wm 0 0 (0/0/0) 0
5 unassigned wm 0 0 (0/0/0) 0
6 usr wm 3 - 253 1.96GB (251/0/0) 4112384
7 unassigned wm 0 0 (0/0/0) 0
partition> quit
依次将要使用的盘全部格式化分区完毕
- 修改磁盘权限
在划分磁盘时若选择了将空间分配给n号片,对应的盘片就是sn,例如磁盘是c0t600000E00D11000000111430000D0000d0,空间分配到了6号片,最终我们使用的磁盘文件名就是c0t600000E00D11000000111430000D0000d0s6
chown grid:asmadmin /dev/rdsk/c0t600000E00D11000000111430000D0000d0s6
chown grid:asmadmin /dev/rdsk/c0t600000E00D1100000011143000030000d0s6
chown grid:asmadmin /dev/rdsk/c0t600000E00D1100000011143000020000d0s6
chown grid:asmadmin /dev/rdsk/c0t600000E00D1100000011143000010000d0s6
chown grid:asmadmin /dev/rdsk/c0t600000E00D1100000011143000000000d0s6
chmod 660 /dev/rdsk/c0t600000E00D11000000111430000D0000d0s6
chmod 660 /dev/rdsk/c0t600000E00D1100000011143000030000d0s6
chmod 660 /dev/rdsk/c0t600000E00D1100000011143000020000d0s6
chmod 660 /dev/rdsk/c0t600000E00D1100000011143000010000d0s6
chmod 660 /dev/rdsk/c0t600000E00D1100000011143000000000d0s6
3 安装
3.1 安装crs软件(BXDB1上)
- 以 grid 用户运行安装程序
# xhost +
# 解压安装软件
# su – grid
$ export DISPLAY=客户机ip:0.0
$ ./runInstaller
选择第一项,next
选择第二项高级安装,next
添加中文语言
填上SCAN信息,其中Cluster name自定义,SCAN name是hosts文件中配置
添加节点
点击ssh connectivity配置ssh等效性
根据hosts文件的配置选择网卡用户
选择将OCR文件放在ASM中
建立ASM磁盘组,添加之前为OCR准备的裸盘文件,冗余方式选择external
为ASM帐号设置密码1qaz.oracle,若提示密码不够安全,点击yes即可
选择用户组
选择安装路径
选择inventory目录,默认即可
开始检查系统环境是否满足
提示以下条件不满足,这两个错误可以忽略
确认无误开始安装
安装完毕按提示在两个节点分别以root用户执行脚本
安装完毕后在检验cluster状态时报错,这是因为我们没有配置DNS服务器来分配VIP和SCANip,而是通过手动分配,该错误可以忽略,至此cluster软件安装完毕
3.2 安装database软件(BXDB1上)
- 以 grid 用户运行安装程序
# xhost +
# 解压安装软件
# su – grid
$ export DISPLAY=客户机ip:0.0
$ ./runInstaller
不要选择接收安全补丁信息,若出现提示选yes即可
跳过软件更新
选择只安装数据库软件
选择集群模式安装
点击ssh connectivity配置用户等效性
添加中文语言
选择安装企业版
选择安装目录,由于根目录属于grid用户,因此在两个节点都手动建好该目录,并将权限和属组赋给oracle用户
mkdir -p /oracle/app/oracle
chown oracle:oinstall /oracle/app/oracle
选择安装软件组
检查系统环境是否满足安装要求
以下错误可以忽略
检查无误开始安装
安装完毕,按提示以root用户在两个节点执行脚本即可
执行相应脚本完成安装
3.3 创建数据库
- 以 grid 用户建立ASM磁盘组
# xhost +
# su – grid
$ export DISPLAY=客户机ip:0.0
$ asmca
按照下图建立磁盘组,其中CRS是在安装CRS软件时已经建立的
- 以 oracle 用户建立集群数据库
# xhost +
# su – oracle
$ export DISPLAY=客户机ip:0.0
$ dbca
选择集群数据库
选择建立数据库
选择自定义数据库
根据实际情况输入数据库名,勾选所有节点
选择配置EM
为用户配置密码,这里密码全部为1qaz.oracle,若提示密码不够安全,点击yes即可
选择数据文件存储方式,选择ASM,并填入之前建好的磁盘组名,会要求输入ASMSNMP密码,输入1qaz.oracle即可
配置快速恢复区,选择之前建好的ASM磁盘组,填入大小,这里是900g,勾选激活归档
去除不必要的组件
配置内存大小,勾选自动内存管理,该值可以在建完库后根据实际情况修改
配置块大小和连接数
配置字符集,选择AL32UTF8
按照默认选择专有模式即可
配置数据文件,每个节点分配4组,将redo大小改为512M
确认无误开始建库
开始建库
至此数据库安装完毕
4 常用维护命令
4.1 启动和关闭集群
(1) 启动集群件和集群数据库
集群系统默认是自动启动的,手工启动集群件的命令是:
-bash-3.00# cd /u01/app/11.2.0/grid/bin (root用户**)**
-bash-3.00# ./crsctl start cluster
也可以以下命令(在11.2版本中不建议使用),以grid用户执行
-bash-3.00# su - grid
-bash-3.00$ crs_start -all
启动集群数据库
-bash-3.00$ su - oracle
-bash-3.00$ srvctl start database -d racdb (启动全部实例节点)
-bash-3.00$ srvctl start instance -d racdb -n racdb1 (节点1上启动数据库实例**)**
-bash-3.00$ srvctl start instance -d racdb -n racdb2 (节点2上启动数据库实例**)**
(2) 关闭RAC集群数据库和集群件
先关闭集群数据库
-bash-3.00$ su - oracle
-bash-3.00$ srvctl stop database -d racdb
再关闭集群件(root用户)
-bash-3.00$ su -
-bash-3.00# cd /u01/app/11.2.0/grid/bin
-bash-3.00# ./crsctl stop cluster
4.2 RAC常用命令
集群系统的维护主要使用srvctl命令就可以完成,我们可以使用帮助命令来查看其使用,在oracle用户下执行 srvctl -help 来查看帮助信息
-bash-3.00# su - oracle
-bash-3.00$ srvctl -help
Usage: srvctl []
commands: enable|disable|start|stop|relocate|status|add|remove|modify|getenv|setenv|unsetenv|config
objects: database|instance|service|nodeapps|vip|asm|diskgroup|listener|srvpool|server|scan|scan_listener|oc4j|home|filesystem|gns
For detailed help on each command and object and its options use:
srvctl -h or
srvctl -h
该命令的格式和用法都列出来了,继续查看具体用法就在命令和对象的后面加 -h 参数,这样一层一层的查看帮助就可以得到全部的使用方法而不用查看其它的资料。
-bash-3.00$ srvctl add -h (给集群添加对象,比较重要的如:service, srvpool等等)
-bash-3.00$ srvctl remove -h (删除集群的对象)
-bash-3.00$ srvctl modify -h (修改集群的对象)
-bash-3.00$ srvctl config -h (查看集群内对象的配置信息)
-bash-3.00$ srvctl status -h (查看集群内对象的状态信息)
-bash-3.00$ srvctl relocate -h (把集群的对象重定位到其它实例节点,如oc4j, gns只在一个实例节点上有效,使用该命令可以把对象转移到其它实例节点)
-bash-3.00$ srvctl enable -h (把集群内已经存在的对象置于可用状态)
-bash-3.00$ srvctl disable -h (把集群内已经存在的对象置于不可用状态)
-bash-3.00$ srvctl start -h (启动集群内已经存在的对象)
-bash-3.00$ srvctl stop -h (停止集群内已经存在的对象)
常用的比如:
◆查看全部安装集群数据库名称
-bash-3.00$ srvctl config database
racdb
◆查看指定的集群数据库的配置信息
-bash-3.00$ srvctl config database -d racdb
Database unique name: racdb
Database name: racdb
Oracle home: /u01/app/oracle/product/11.2.0/dbhome_1
Oracle user: oracle
Spfile: +RACDB_DATA/racdb/spfileracdb.ora
Domain: racnode.com
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: racdb
Database instances: racdb1,racdb2
Disk Groups: RACDB_DATA,FRA
Services: MYRAC
Database is administrator managed
◆显示节点应用程序的配置
-bash-3.00$ srvctl config nodeapps -a -g -s -e
VIP exists.:racnode1
VIP exists.: /192.168.1.201/192.168.1.201/255.255.255.0/e1000g0
VIP exists.:racnode2
VIP exists.: /192.168.1.205/192.168.1.205/255.255.255.0/e1000g0
GSD exists.
ONS daemon exists. Local port 6100, remote port 6200
eONS daemon exists. Multicast port 16717, multicast IP address 234.92.69.133, listening port 2016
◆列出集群中所有运行的实例
-bash-3.00$ sqlplus / as sysdba
SQL> col host format a10
SQL> col db_status format a8
SQL> col inst_name format a8
SQL> SELECT inst_id, instance_number inst_no, instance_name inst_name,
2 parallel, status, database_status db_status, active_state state,
3 host_name host
4 FROM gv$instance
5 Order By inst_id;
INST_ID INST_NO INST_NAM PAR STATUS DB_STATU STATE HOST
1 1 racdb1 YES OPEN ACTIVE NORMAL racnode1
2 2 racdb2 YES OPEN ACTIVE NORMAL racnode2
◆列出所有数据文件、临时数据文件、日志文件、控制文件
SQL> set pagesize 100; (设置sqlplus的显示行数,可以一次显示100行记录)
SQL> set linesize 100; (设置sqlplus的显示总宽度, 默认80,设置成100或者更宽都可以)
SQL> col file_size format a9;
SQL> col file# format 99999; (格式化数值类型的字段)
SQL>
SQL> SELECT ‘data_file’ as file_type, file#, creation_time, status, name, to_char(bytes/(1024*1024) || ‘M’) as file_size FROM v$datafile
2 union
3 SELECT ‘temp_file’ as file_type, file#, creation_time, status, name, to_char(bytes/(1024*1024) || ‘M’) as file_size FROM v$tempfile
4 union
5 SELECT ‘log_file’ as file_type, group#, null as creation_time, type, member, null as file_size FROM v$logfile
6 union
7 SELECT ‘control_file’ as file_type, null as file#, null as creation_time, status, name, null as file_size FROM v$controlfile;
FILE_TYPE FILE# CREATION_ STATUS NAME FILE_SIZE
control_file +FRA/racdb/controlfile/current.256.711918025
control_file +RACDB_DATA/racdb/controlfile/current.260.711918019
data_file 1 20-NOV-09 SYSTEM +RACDB_DATA/racdb/datafile/system.256.711917577 690M
data_file 2 20-NOV-09 ONLINE +RACDB_DATA/racdb/datafile/sysaux.257.711917583 610M
data_file 3 20-NOV-09 ONLINE +RACDB_DATA/racdb/datafile/undotbs1.258.711917585 90M
data_file 4 20-NOV-09 ONLINE +RACDB_DATA/racdb/datafile/users.259.711917585 5M
data_file 5 25-FEB-10 ONLINE +RACDB_DATA/racdb/datafile/example.264.711918155 100M
data_file 6 25-FEB-10 ONLINE +RACDB_DATA/racdb/datafile/undotbs2.265.711919153 50M
data_file 7 04-MAR-10 ONLINE +RACDB_DATA/racdb/datafile/ts_front.269.712715421 300M
log_file 1 ONLINE +FRA/racdb/onlinelog/group_1.257.711918047
log_file 1 ONLINE +RACDB_DATA/racdb/onlinelog/group_1.261.711918033
log_file 2 ONLINE +FRA/racdb/onlinelog/group_2.258.711918069
log_file 2 ONLINE +RACDB_DATA/racdb/onlinelog/group_2.262.711918057
log_file 3 ONLINE +FRA/racdb/onlinelog/group_3.259.711919447
log_file 3 ONLINE +RACDB_DATA/racdb/onlinelog/group_3.266.711919433
log_file 4 ONLINE +FRA/racdb/onlinelog/group_4.260.711919483
log_file 4 ONLINE +RACDB_DATA/racdb/onlinelog/group_4.267.711919461
temp_file 1 25-FEB-10 ONLINE +RACDB_DATA/racdb/tempfile/temp.263.711918123 35M
18 rows selected.
◆查看asm磁盘(vKaTeX parse error: Expected 'EOF', got '和' at position 10: asm_disk)和̲asm磁盘组(vasm_diskgroup)的情况
SQL> SELECT group_number group#, disk_number disk#, state, redundancy, name, failgroup, path, failgroup_type FROM v$asm_disk;
GROUP# DISK# STATE REDUNDA NAME FAILGROUP PATH FAILGRO
1 0 NORMAL UNKNOWN CRS_0000 CRS_0000 /ShareDisk/crs1 REGULAR
3 2 NORMAL UNKNOWN RACDB_DATA_0002 FG1 /ShareDisk/asm1 REGULAR
3 3 NORMAL UNKNOWN RACDB_DATA_0003 FG1 /ShareDisk/asm2 REGULAR
3 0 NORMAL UNKNOWN RACDB_DATA_0000 FG2 /ShareDisk/asm3 REGULAR
3 1 NORMAL UNKNOWN RACDB_DATA_0001 FG2 /ShareDisk/asm4 REGULAR
2 0 NORMAL UNKNOWN FRA_0000 FRA_0000 /ShareDisk/fra1 REGULAR
2 1 NORMAL UNKNOWN FRA_0001 FRA_0001 /ShareDisk/fra2 REGULAR
0 8 NORMAL UNKNOWN /ShareDisk/spfile REGULAR
0 1 NORMAL UNKNOWN /ShareDisk/crs2 REGULAR
SQL> SELECT group_number, name, state, type, total_mb, free_mb FROM v$asm_diskgroup;
GROUP_NUMBER NAME STATE TYPE TOTAL_MB FREE_MB
2 FRA CONNECTED NORMAL 184322 182400
1 CRS MOUNTED EXTERN 2048 1652
3 RACDB_DATA CONNECTED NORMAL 778240 773770
查看试图结构的方法
SQL> desc v$asm_disk;
SQL> desc v$asm_diskgroup;
通过两个试图的联立,可以查询更多的信息。
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