Oracle 11g RAC 搭建详细步骤

浅浅的花香味﹌ 2022-07-16 15:07 389阅读 0赞

Oracle RAC 搭建步骤详解

**前期准备**：

数据库:11.2.0.4

OS：Centos 6.8

IP分配：

\#publice ip

192.168.180.2 rac1

192.168.180.3 rac2

\#private ip

10.10.10.2  rac1-priv

10.10.10.3  rac2-priv

\#vip

192.168.180.4 rac1-vip

192.168.180.5 rac2-vip

\#scan ip

192.168.180.6 rac-scan

RAC 存储配置：

OCR\_VOTING  3个 4G

DATA         1个 50G

FRA\_ARC      1个 20G

**1. 配置udev（所有节点）**

关于RAC 共享存储可参考：[http://blog.csdn.net/shiyu1157758655/article/details/56837550][http_blog.csdn.net_shiyu1157758655_article_details_56837550]

用如下脚本获取绑定脚本：注意这里的 c d e f g是要作为共享的存储的磁盘，要根据自己实际情况修改。

for i in c d e f g ;

echo "KERNEL==\\"sd\*\\", BUS==\\"scsi\\",PROGRAM==\\"/sbin/scsi\_id --whitelisted --replace-whitespace--device=/dev/\\$name\\", RESULT==\\"\`/sbin/scsi\_id --whitelisted--replace-whitespace --device=/dev/sd$i\`\\", NAME=\\"asm-disk$i\\",OWNER=\\"grid\\", GROUP=\\"asmadmin\\",MODE=\\"0660\\""     >> /etc/udev/rules.d/99-oracle-asmdevices.rules

done

**重启start\_udev**

**2. 添加组和用户（所有节点）**

groupadd -g 1000 oinstall

groupadd -g 1200 asmadmin

groupadd -g 1201 asmdba

groupadd -g 1202 asmoper

groupadd -g 1300 dba

groupadd -g 1301 oper

useradd -m -u 1100 -g oinstall -Gasmadmin,asmdba,asmoper,dba -d /home/grid-s /bin/bash grid

useradd -m -u 1101 -g oinstall -Gdba,oper,asmdba -d /home/oracle -s/bin/bash oracle

**--将用户grid添加到dba组：**

\[root@rac1 app\]\# gpasswd -a grid dba

Adding user grid to group dba

**--确认用户信息：**

\[root@rac1 ~\]\# id oracle

uid=502(oracle)gid=507(oinstall)groups=507(oinstall),502(dba),503(oper),506(asmdba)

\[root@rac1 ~\]\# id grid

uid=1100(grid) gid=507(oinstall)groups=507(oinstall),504(asmadmin),506(asmdba),505(asmoper)

**--修改密码：**

passwd oracle

passwd grid

**3.  禁用防火墙和SELNUX（所有节点）**

关闭防火墙：

service iptables status

service iptables stop

chkconfig iptables off

chkconfig iptables –list

**设置/etc/selinux/config 文件，将SELINUX设置为disabled。**

[root@rac1 ~]# cat/etc/selinux/config

\# This file controls the state of SELinux on the system.

\# SELINUX= can take one of these three values:

\#     enforcing - SELinux securitypolicy is enforced.

\#     permissive - SELinux printswarnings instead of enforcing.

\#     disabled - No SELinux policyis loaded.

SELINUX=disabled

\# SELINUXTYPE= can take one of these two values:

\#     targeted - Targeted processesare protected,

\#     mls - Multi Level Securityprotection.

SELINUXTYPE=targeted

**4.  配置时间同步(所有节点)**

这里我们使用CTSS.所以要停用 NTP 服务，并从初始化序列中禁用该服务，并删除 ntp.conf 文件。以 root 用户身份在两个 OracleRAC 节点上运行以下命令：

[root@rac1 ~]# /sbin/service ntpd stop

Shutting down ntpd: [ OK ]

[root@rac1 ~]# chkconfig ntpd off

[root@rac1 ~]# mv /etc/ntp.conf/etc/ntp.conf.original

[root@rac1 ~]# chkconfig ntpd --list

ntpd 0:off 1:off 2:off 3:off 4:off 5:off 6:off

**还要删除以下文件：**

rm /var/run/ntpd.pid

此文件保存了 NTP 后台程序的 pid

**5.  创建目录结构（所有节点）**

Inventory 目录：/u01/app/oraInventory

ORACLE BASE 目录：/u01/app/oracle

Grid Infrastructure HOME 目录：/u01/app/grid/product/11.2.0/grid\_1

RDBMS HOME 目录：/u01/app/oracle/product/11.2.0/db\_1

配置相关目录的属主及权限

Inventory 目录：属主，grid:oinstall；权限，775

ORACLE BASE 目录：属主，oracle:oinstall；权限，775

Grid Infrastructure HOME 目录：属主，grid:oinstall；权限，775

RDBMS HOME 目录：属主，oracle:oinstall；权限，775

mkdir -p/u01/app/oraInventory

mkdir -p/u01/app/oracle

mkdir -p/u01/app/grid/product/11.2.0/grid\_1

mkdir -p/u01/app/oracle/product/11.2.0/db\_1

\[root@rac1 ~\]\#chown -R grid:oinstall /u01/app/oraInventory/

\[root@rac1 ~\]\#chown -R oracle:oinstall /u01/app/oracle/

\[root@rac1 ~\]\#chown -R grid:oinstall /u01/app/grid/product/12.1.0/grid\_1/

\[root@rac1 ~\]\#chown -R oracle:oinstall /u01/app/oracle/product/12.1.0/db\_1/

**6.  配置主机/etc/hosts 别名（所有节点）**

如果需要没有计划采用 DNS 服务器，需要在服务器本地配置服务器主机名与 IP 地址的映射

关系。具体涉及的主要配置文件为：

/etc/hosts

该配置文件主要的配置信息建议如下

127.0.0.1   localhost  //记住这个一定要加上

\#public ip

192.168.180.2  rac1

192.168.180.3  rac2

\#private ip

10.10.10.2     rac1-priv

10.10.10.3     rac2-priv

\#vip

192.168.180.4  rac1-vip

192.168.180.5  rac2-vip

\#scan ip

192.168.180.6  rac-scan

注意：除了本机主机名映射地址条目外，两个节点的/etc/hosts 配置文件需要一致。上述建议

信息中：public ip、virtual ip、scan 为提供服务的 ip；privateip 为心跳私有 ip

**7.  配置节点互信机制（所有节点）**

需要将 grid 用户、oracle 用户配置好集群节点之间的互信机制。配置集群节点互信机制建议

采用ssh 协议。主要涉及的配置文件有：

$HOME/.ssh/authorized\_keys

注意：此文件需要手工创建。

具体可参考：http://blog.csdn.net/shiyu1157758655/article/details/56838603

**8.  配置环境变量（所有节点）**

需要对 grid 用户、oracle 用户配置好环境变量。

**grid 用户的环境变量配置建议如下：**

umask 022

PS1='$ORACLE\_SID'":"'$PWD'"@"\`hostname\`">"

ORACLE\_BASE=/u01/app/oracle; export ORACLE\_BASE

ORACLE\_HOME=/u01/app/grid/product/11.2.0/grid\_1; export ORACLE\_HOME

ORACLE\_SID=+ASM1; export ORACLE\_SID

ORACLE\_TERM=xterm; export ORACLE\_TERM

TMPDIR=/var/tmp; export TMPDIR

NLS\_DATE\_FORMAT="YYYY/MM/DD hh24:mi:ss"; export NLS\_DATE\_FORMAT

ORA\_NLS33=$ORACLE\_HOME/ocommon/nls/admin/data; export ORA\_NLS33

TNS\_ADMIN=$ORACLE\_HOME/network/admin; export TNS\_ADMIN DISPLAY

LIBPATH=$ORACLE\_HOME/lib; export LIBPATH

PATH=$PATH:$ORACLE\_HOME/bin:/usr/sbin; export PATH

**Oracle用户的环境变量配置建议如下：**

umask 022

PS1='$ORACLE\_SID'":"'$PWD'"@"\`hostname\`">"

ORACLE\_BASE=/u01/app/oracle\_base; export ORACLE\_BASE

ORACLE\_HOME=$ORACLE\_BASE/product/11.2.0/db\_1; export ORACLE\_HOME

ORACLE\_SID=rac1; export ORACLE\_SID

ORACLE\_TERM=xterm; export ORACLE\_TERM

TMPDIR=/var/tmp; export TMPDIR

NLS\_DATE\_FORMAT="YYYY/MM/DD hh24:mi:ss"; export NLS\_DATE\_FORMAT

ORA\_NLS33=$ORACLE\_HOME/ocommon/nls/admin/data; export ORA\_NLS33

TNS\_ADMIN=$ORACLE\_HOME/network/admin; export TNS\_ADMIN DISPLAY

LIBPATH=$ORACLE\_HOME/lib; export LIBPATH

PATH=$PATH:$ORACLE\_HOME/bin:/usr/sbin; export PATH

**9.  修改/etc/security/limits.conf（所有节点）**

以 root 用户身份，在每个 OracleRAC 节点上，在 /etc/security/limits.conf 文件中添加如下内容，或者执行执行如下命令：

root@rac1 ~]# cat >> /etc/security/limits.conf <<EOF

grid soft nproc 2047

grid hard nproc 16384

grid soft nofile 1024

grid hard nofile 65536

oracle soft nproc 2047

oracle hard nproc 16384

oracle soft nofile 1024

oracle hard nofile 65536

EOF

**10. 修改/etc/pam.d/login（所有节点）**

在每个 OracleRAC 节点上，在/etc/pam.d/login 文件中添加或编辑下面一行内容：

[root@rac1 ~]# cat >> /etc/pam.d/login <<EOF

session required pam_limits.so

EOF

**11. 配置系统默认 profile （所有节点）**

确认以下配置加载到系统的默认 profile 中。具体涉及到的主要配置文件如下：

if \[ $USER = "oracle" \] || \[ $USER = "grid" \]; then

if \[ $SHELL = "/bin/ksh" \]; then

ulimit -p 16384

ulimit -n 65536

else

ulimit -u 16384 -n 65536

umask 022

**12. 修改/etc/sysctl.conf（所有节点）**

\#vi /etc/sysctl.conf

kernel.shmmax = 4294967295

kernel.shmall = 2097152

kernel.shmmni = 4096

kernel.sem = 250 32000 100 128

fs.file-max = 6815744

net.ipv4.ip\_local\_port\_range = 9000 65500

net.core.rmem\_default=262144

net.core.rmem\_max=4194304

net.core.wmem\_default=262144

net.core.wmem\_max=1048576

fs.aio-max-nr=1048576

kernel.panic\_on\_oops=1

**使修改的参数生效：**

\[root@rac1 ~\]\# sysctl -p

**13. 安装前检查**

\+ASM1:/src/oracle/grid@rac1>./runcluvfy.sh stage -pre crsinst -nrac1,rac2

Performing pre-checks for cluster services setup

Checking node reachability...

Node reachability check passed from node "rac1"

Checking user equivalence...

User equivalence check passed for user "grid"

Checking node connectivity...

Checking hosts config file...

Verification of the hosts config file successful

Node connectivity passed for subnet "192.168.180.0" with node(s)rac2,rac1

TCP connectivity check passed for subnet "192.168.180.0"

Node connectivity passed for subnet "10.10.10.0" with node(s)rac2,rac1

TCP connectivity check passed for subnet "10.10.10.0"

Interfaces found on subnet "192.168.180.0" that are likelycandidates for VIP are:

rac2 eth0:192.168.180.3

rac1 eth0:192.168.180.2

Interfaces found on subnet "10.10.10.0" that are likelycandidates for a private interconnect are:

rac2 eth1:10.10.10.3

rac1 eth1:10.10.10.2

Checking subnet mask consistency...

Subnet mask consistency check passed for subnet "192.168.180.0".

Subnet mask consistency check passed for subnet "10.10.10.0".

Subnet mask consistency check passed.

Node connectivity check passed

Checking multicast communication...

Checking subnet "192.168.180.0" for multicast communication withmulticast group "230.0.1.0"...

Check of subnet "192.168.180.0" for multicast communication withmulticast group "230.0.1.0" passed.

Checking subnet "10.10.10.0" for multicast communication withmulticast group "230.0.1.0"...

Check of subnet "10.10.10.0" for multicast communication withmulticast group "230.0.1.0" passed.

Check of multicast communication passed.

Checking ASMLib configuration.

Check for ASMLib configuration passed.

Total memory check passed

Available memory check passed

Swap space check passed

Free disk space check passed for "rac2:/var/tmp"

Free disk space check passed for "rac1:/var/tmp"

Check for multiple users with UID value 1100 passed

User existence check passed for "grid"

Group existence check passed for "oinstall"

Group existence check passed for "dba"

Membership check for user "grid" in group "oinstall"\[as Primary\] passed

Membership check for user "grid" in group "dba" passed

Run level check passed

Hard limits check passed for "maximum open file descriptors"

Soft limits check passed for "maximum open file descriptors"

Hard limits check passed for "maximum user processes"

Soft limits check passed for "maximum user processes"

System architecture check passed

Kernel version check passed

Kernel parameter check passed for "semmsl"

Kernel parameter check passed for "semmns"

Kernel parameter check passed for "semopm"

Kernel parameter check passed for "semmni"

Kernel parameter check passed for "shmmax"

Kernel parameter check passed for "shmmni"

Kernel parameter check passed for "shmall"

Kernel parameter check passed for "file-max"

Kernel parameter check passed for "ip\_local\_port\_range"

Kernel parameter check passed for "rmem\_default"

Kernel parameter check passed for "rmem\_max"

Kernel parameter check passed for "wmem\_default"

Kernel parameter check passed for "wmem\_max"

Kernel parameter check passed for "aio-max-nr"

Package existence check passed for "make"

Package existence check passed for "binutils"

Package existence check passed for "gcc(x86\_64)"

Package existence check passed for "libaio(x86\_64)"

Package existence check passed for "glibc(x86\_64)"

Package existence check passed for "compat-libstdc++-33(x86\_64)"

Package existence check passed for "elfutils-libelf(x86\_64)"

Package existence check failed for"elfutils-libelf-devel"

Check failed on nodes:

rac2,rac1

Package existence check passed for "glibc-common"

Package existence check passed for "glibc-devel(x86\_64)"

Package existence check passed for "glibc-headers"

Package existence check passed for "gcc-c++(x86\_64)"

Package existence check passed for "libaio-devel(x86\_64)"

Package existence check passed for "libgcc(x86\_64)"

Package existence check passed for "libstdc++(x86\_64)"

Package existence check passed for "libstdc++-devel(x86\_64)"

Package existence check passed for "sysstat"

Package existence check passed for "pdksh"

Package existence check passed for "expat(x86\_64)"

Check for multiple users with UID value 0 passed

Current group ID check passed

Starting check for consistency of primary group of root user

Check for consistency of root user's primary group passed

Starting Clock synchronization checks using Network Time Protocol(NTP)...

NTP Configuration file check started...

No NTP Daemons or Services were found to be running

Clock synchronization check using Network Time Protocol(NTP) passed

Core file name pattern consistency check passed.

User "grid" is not part of "root" group. Check passed

Default user file creation mask check passed

Checking consistency of file "/etc/resolv.conf" across nodes

File "/etc/resolv.conf" does not have both domain and searchentries defined

domain entry in file "/etc/resolv.conf" is consistent acrossnodes

search entry in file "/etc/resolv.conf" is consistent acrossnodes

PRVF-5636 : The DNS response time for an unreachable nodeexceeded "15000" ms on following nodes: rac2,rac1

File "/etc/resolv.conf" is not consistent across nodes

Time zone consistency check passed

Pre-check for cluster services setup was unsuccessful on all the nodes.

**   要根据上面的检查去进行排查解决，如果没有配置DNS的话，**

PRVF-5636 : The DNS response time for an unreachable nodeexceeded "15000" ms on following nodes: rac2,rac1

这个可以忽略。

**14.安装grid**

在节点1，用grid用户运行runInstaller。

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\[root@rac1app\]\# chown -R grid:oinstall oracle  //2个节点都要执行

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上面2个可以忽略

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**节点1上执行：**

\[root@rac1~\]\# /u01/app/oraInventory/orainstRoot.sh

Changing permissions of /u01/app/oraInventory.

Adding read,write permissions for group.

Removing read,write,execute permissions for world.

Changing groupname of /u01/app/oraInventory to oinstall.

The execution of the script is complete.

**节点2上执行：**

\[root@rac2~\]\#/u01/app/oraInventory/orainstRoot.sh

Changingpermissions of /u01/app/oraInventory.

Addingread,write permissions for group.

Removingread,write,execute permissions for world.

Changinggroupname of /u01/app/oraInventory to oinstall.

Theexecution of the script is complete.

**节点1上执行：**

\[root@rac1~\]\# /u01/app/grid/product/11.2.0/grid\_1/root.sh

Performingroot user operation for Oracle 11g

Thefollowing environment variables are set as:

ORACLE\_OWNER= grid

ORACLE\_HOME=  /u01/app/grid/product/11.2.0/grid\_1

Enterthe full pathname of the local bin directory: \[/usr/local/bin\]:

Copying dbhome to /usr/local/bin ...

Copying oraenv to /usr/local/bin ...

Copying coraenv to /usr/local/bin ...

Creating/etc/oratab file...

Entrieswill be added to the /etc/oratab file as needed by

DatabaseConfiguration Assistant when a database is created

Finishedrunning generic part of root script.

Nowproduct-specific root actions will be performed.

Usingconfiguration parameter file:/u01/app/grid/product/11.2.0/grid\_1/crs/install/crsconfig\_params

Creatingtrace directory

Userignored Prerequisites during installation

InstallingTrace File Analyzer

Failedto create keys in the OLR, rc = 127, Message:

shared object file: No such file or directory

Failedto create keys in the OLR at/u01/app/grid/product/11.2.0/grid\_1/crs/install/crsconfig\_lib.pm line 7660.

duct/11.2.0/grid\_1/crs/install/u01/app/grid/product/11.2.0/grid\_1/crs/install/rootcrs.pl execution failed

这个报错是缺少包造成的，在2个节点上都安装这个包就行了，具体可参考：[http://blog.csdn.net/shiyu1157758655/article/details/59486625][http_blog.csdn.net_shiyu1157758655_article_details_59486625]

\[root@rac1 ~\]\# rpm -ivh/os/Packages/compat-libcap1-1.10-1.x86\_64.rpm

warning:/os/Packages/compat-libcap1-1.10-1.x86\_64.rpm: Header V3 RSA/SHA256 Signature,key ID c105b9de: NOKEY

Preparing...               \#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# \[100%\]

1:compat-libcap1        \#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\# \[100%\]

**再次执行：**

\[root@rac1~\]\# /u01/app/grid/product/11.2.0/grid\_1/root.sh

Performingroot user operation for Oracle 11g

Thefollowing environment variables are set as:

ORACLE\_OWNER= grid

ORACLE\_HOME=  /u01/app/grid/product/11.2.0/grid\_1

Enterthe full pathname of the local bin directory: \[/usr/local/bin\]:

Thecontents of "dbhome" have not changed. No need to overwrite.

Thecontents of "oraenv" have not changed. No need to overwrite.

Thecontents of "coraenv" have not changed. No need to overwrite.

Entrieswill be added to the /etc/oratab file as needed by

DatabaseConfiguration Assistant when a database is created

Finishedrunning generic part of root script.

Nowproduct-specific root actions will be performed.

Usingconfiguration parameter file:/u01/app/grid/product/11.2.0/grid\_1/crs/install/crsconfig\_params

Userignored Prerequisites during installation

InstallingTrace File Analyzer

OLRinitialization - successful

root wallet

root wallet cert

root cert export

peer wallet

profile reader wallet

pa wallet

peer wallet keys

pa wallet keys

peer cert request

pa cert request

peer cert

pa cert

peer root cert TP

profile reader root cert TP

pa root cert TP

peer pa cert TP

pa peer cert TP

profile reader pa cert TP

profile reader peer cert TP

peer user cert

pa user cert

AddingClusterware entries to upstart

CRS-2672:Attempting to start 'ora.mdnsd' on 'rac1'

CRS-2676:Start of 'ora.mdnsd' on 'rac1' succeeded

CRS-2672:Attempting to start 'ora.gpnpd' on 'rac1'

CRS-2676:Start of 'ora.gpnpd' on 'rac1' succeeded

CRS-2672:Attempting to start 'ora.cssdmonitor' on 'rac1'

CRS-2672:Attempting to start 'ora.gipcd' on 'rac1'

CRS-2676:Start of 'ora.gipcd' on 'rac1' succeeded

CRS-2676:Start of 'ora.cssdmonitor' on 'rac1' succeeded

CRS-2672:Attempting to start 'ora.cssd' on 'rac1'

CRS-2672:Attempting to start 'ora.diskmon' on 'rac1'

CRS-2676:Start of 'ora.diskmon' on 'rac1' succeeded

CRS-2676:Start of 'ora.cssd' on 'rac1' succeeded

ASMcreated and started successfully.

DiskGroup OCR\_VOTING created successfully.

clscfg:-install mode specified

Successfullyaccumulated necessary OCR keys.

CreatingOCR keys for user 'root', privgrp 'root'..

Operationsuccessful.

CRS-4256:Updating the profile

Successfuladdition of voting disk 5ddc4ea587f04f18bfb066d1d3ff07d9.

Successfuladdition of voting disk 64611da725794f0ebf206204283eff9a.

Successfuladdition of voting disk 46a2f2c1a5a14f4fbf58e6505f889674.

Successfullyreplaced voting disk group with +OCR\_VOTING.

CRS-4256:Updating the profile

CRS-4266:Voting file(s) successfully replaced

\#\#  STATE   File Universal Id               File Name Disk group

\--  -----   -----------------               --------- ---------

1. ONLINE  5ddc4ea587f04f18bfb066d1d3ff07d9 (/dev/asm-diskc) \[OCR\_VOTING\]

2. ONLINE  64611da725794f0ebf206204283eff9a (/dev/asm-diskd) \[OCR\_VOTING\]

3. ONLINE  46a2f2c1a5a14f4fbf58e6505f889674 (/dev/asm-diske) \[OCR\_VOTING\]

Located3 voting disk(s).

CRS-2672:Attempting to start 'ora.asm' on 'rac1'

CRS-2676:Start of 'ora.asm' on 'rac1' succeeded

CRS-2672:Attempting to start 'ora.OCR\_VOTING.dg' on 'rac1'

CRS-2676:Start of 'ora.OCR\_VOTING.dg' on 'rac1' succeeded

ConfigureOracle Grid Infrastructure for a Cluster ... succeeded

**节点2上执行：**

\[root@rac2~\]\# /u01/app/grid/product/11.2.0/grid\_1/root.sh

Performingroot user operation for Oracle 11g

Thefollowing environment variables are set as:

ORACLE\_OWNER= grid

ORACLE\_HOME=  /u01/app/grid/product/11.2.0/grid\_1

Enterthe full pathname of the local bin directory: \[/usr/local/bin\]:

Copying dbhome to /usr/local/bin ...

Copying oraenv to /usr/local/bin ...

Copying coraenv to /usr/local/bin ...

Creating/etc/oratab file...

Entrieswill be added to the /etc/oratab file as needed by

DatabaseConfiguration Assistant when a database is created

Finishedrunning generic part of root script.

Nowproduct-specific root actions will be performed.

Usingconfiguration parameter file:/u01/app/grid/product/11.2.0/grid\_1/crs/install/crsconfig\_params

Creatingtrace directory

Userignored Prerequisites during installation

InstallingTrace File Analyzer

OLRinitialization - successful

AddingClusterware entries to upstart

terminating

Anactive cluster was found during exclusive startup, restarting to join thecluster

ConfigureOracle Grid Infrastructure for a Cluster ... succeeded

点击ok继续安装：

这里有个报错，我选择忽略掉，貌似没啥影响。

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到此grid已经安装成功。

**15. 创建ASM磁盘组**

以grid用户登陆，执行asmca

选择【create】

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**16. 安装Oracle RDBMS软件**

在创建完磁盘组之后，即可安装RDBMS软件

注意：安装RDBMS软件，需要使用oracle用户创建

./runInstaller

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这里仅安装软件

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忽略上面2个报错

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点击安装即可

**17. 创建数据库**

以oracle用户执行dbca

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点击执行即可

**18. 总结**

到此oracle11g rac 安装完成，期间遇到的各种问题，需要耐心的一个个解决。

[http_blog.csdn.net_shiyu1157758655_article_details_56837550]: http://blog.csdn.net/shiyu1157758655/article/details/56837550
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[http_blog.csdn.net_shiyu1157758655_article_details_59486625]: http://blog.csdn.net/shiyu1157758655/article/details/59486625
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