一、問題描述

1.作業系統資訊
$ 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.資料庫版本資訊
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.問題現象
當RAC部署完成後，從客戶端反覆連線資料庫時，出現時而能連通，時而斷開連線的錯誤，連線資料庫不穩定！
具體情況如下：
sys@orcl> conn system/system@tnsrac
已連線。
sys@orcl> conn system/system@tnsrac
ERROR:
ORA-12545: 因目標主機或物件不存在，連線失敗

警告: 您不再連線到 ORACLE。
sys@orcl> conn system/system@tnsrac
已連線。
sys@orcl> conn system/system@tnsrac
已連線。
sys@orcl> conn system/system@tnsrac
ERROR:
ORA-12545: 因目標主機或物件不存在，連線失敗

警告: 您不再連線到 ORACLE。

客戶端 tnsnames.ora 配置情況如下：
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)
)
)

伺服器端hosts檔案內容：
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、解決方法

1.使用 sqlplus / as sysdba 登陸資料庫檢視local_listener設定情況
sys@orcl> show parameter list
NAME TYPE VALUE
------------------- -------------------- --------------------
local_listener string
remote_listener string LISTENERS_ORCL

2.在伺服器端racdb1,racdb2上分別編輯tnsnames.ora和listener.ora檔案,將兩個檔案中的host主機名字均修改為具體的VIP地址
如將下面部分
LISTENERS_ORCL =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = racdb1-vip)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = racdb2-vip)(PORT = 1521))
)
改為:
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節點的tnsnames.ora增加如下內容
local_listener_rac =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.12.21)(PORT = 1521))
)

4.在racdb2節點的tnsnames.ora增加如下內容
local_listener_rac =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.12.22)(PORT = 1521))
)

4.使用 sqlplus / as sysdba 登陸資料庫修改local_listener引數

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

5.重啟兩節點的例項和監聽
sys@orcl> shutdown immediate;
sys@orcl> startup;

$ lsnrctl stop
$ lsnrctl start

三、測試
system@orcl> conn system/system@tnsrac
已連線。
system@orcl> select instance_name from v$instance;

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

system@orcl> conn system/system@tnsrac
已連線。
system@orcl> select instance_name from v$instance;

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

system@orcl> conn system/system@tnsrac
已連線。
system@orcl> select instance_name from v$instance;

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

system@orcl> conn system/system@tnsrac
已連線。
system@orcl> select instance_name from v$instance;

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

到此，該問題已經處理完成。

ORACLE 10G rac故障處理一例

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