一、问题描述

1.操作系统信息
$ uname -a
Linux racdb1 2.6.18-53.el5xen #1 SMP Wed Oct 10 16:48:44 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux

2.数据库版本信息
sys@orcl> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production

3.问题现象
当RAC部署完成后，从客户端反复连接数据库时，出现时而能连通，时而断开连接的错误，连接数据库不稳定！
具体情况如下：
sys@orcl> conn system/system@tnsrac
已连接。
sys@orcl> conn system/system@tnsrac
ERROR:
ORA-12545: 因目标主机或对象不存在，连接失败

警告: 您不再连接到 ORACLE。
sys@orcl> conn system/system@tnsrac
已连接。
sys@orcl> conn system/system@tnsrac
已连接。
sys@orcl> conn system/system@tnsrac
ERROR:
ORA-12545: 因目标主机或对象不存在，连接失败

警告: 您不再连接到 ORACLE。

客户端 tnsnames.ora 配置情况如下：
tnsrac =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.12.21)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.12.22)(PORT = 1521))
(LOAD_BALANCE = yes)
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)

服务器端hosts文件内容：
orcl1@racdb1 /home/oracle$ cat /etc/hosts
127.0.0.1 localhost.localdomain localhost
# Public IP - (eth0)
172.16.12.23 racdb1
172.16.12.24 racdb2
# Virtual IP (VIP) - (eth0)
172.16.12.21 racdb1-vip
172.16.12.22 racdb2-vip
# Private IP - (eth1)
10.10.10.1 racdb1-priv
10.10.10.2 racdb2-priv

二、解决方法

1.使用 sqlplus / as sysdba 登陆数据库查看local_listener设置情况
sys@orcl> show parameter list
NAME TYPE VALUE
------------------- -------------------- --------------------
local_listener string
remote_listener string LISTENERS_ORCL

2.在服务器端racdb1,racdb2上分别编辑tnsnames.ora和listener.ora文件,将两个文件中的host主机名字均修改为具体的VIP地址
如将下面部分
LISTENERS_ORCL =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = racdb1-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = racdb2-vip)(PORT = 1521))
)
改为:
LISTENERS_ORCL =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.12.21)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.12.22)(PORT = 1521))
)

3.在racdb1节点的tnsnames.ora增加如下内容
local_listener_rac =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.12.21)(PORT = 1521))
)

4.在racdb2节点的tnsnames.ora增加如下内容
local_listener_rac =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.12.22)(PORT = 1521))
)

4.使用 sqlplus / as sysdba 登陆数据库修改local_listener参数

alter system set local_listener='local_listener_rac' scope=both;

5.重启两节点的实例和监听
sys@orcl> shutdown immediate;
sys@orcl> startup;

$ lsnrctl stop
$ lsnrctl start

三、测试
system@orcl> conn system/system@tnsrac
已连接。
system@orcl> select instance_name from v$instance;

INSTANCE_NAME
--------------------------------
orcl2

system@orcl> conn system/system@tnsrac
已连接。
system@orcl> select instance_name from v$instance;

INSTANCE_NAME
--------------------------------
orcl1

system@orcl> conn system/system@tnsrac
已连接。
system@orcl> select instance_name from v$instance;

INSTANCE_NAME
--------------------------------
orcl2

system@orcl> conn system/system@tnsrac
已连接。
system@orcl> select instance_name from v$instance;

INSTANCE_NAME
--------------------------------
orcl1

到此，该问题已经处理完成。

ITPub博客

ORACLE 10G rac故障处理一例

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