更改数据库编码格式

--查看oracle数据库字符集：

select userenv('language') from dual;

查询结果：

SIMPLIFIED CHINESE_CHINA.AL32UTF8

--修改oracle数据库字符集：（在SQL Plus中）

sql> conn / as sysdba;

sql> shutdown immediate;

database closed.

database dismounted.

oracle instance shut down.

sql> startup mount;

oracle instance started.

total system global area 135337420 bytes

fixed size 452044 bytes variable size 109051904 bytes

database buffers 25165824 bytes

redo buffers 667648 bytes

database mounted.

sql> alter system enable restricted session;

system altered.

sql> alter system set job_queue_processes=0;

system altered.

sql> alter system set aq_tm_processes=0;

system altered.

sql> alter database open;

database altered.

sql> alter database character set internal_use JA16SJIS; sql> shutdown immediate;

sql> startup;

1 2 3 4

5

1 2 3

下面就是网络和操作系统的配置问题了，怎么样能够解析我的主机名的问题了

可以通过下面的方式连接

sqlplus sys/oracle@boway

这样的话，会连接boway这台服务器，并且listener来确定你所要连接的service_name。其中,SERVICE_NAME 未SID的名称非数据库名称

ORA-12518: TNS: 监听程序无法分发客户机连接

ORACLE 2008-07-12 13:25:55 阅读395 评论0 字号：大中小

今天在自己的T61上装了ORACLE10G，成功装好后，连数据库报如下错误：

SQL> conn sys/sys@my10g as sysdba

ERROR:

ORA-12518: TNS: 监听程序无法分发客户机连接

SQL> conn sjh/sjh@my10g

ERROR:

ORA-12518: TNS: 监听程序无法分发客户机连接

C:\Documents and Settings\is_sjh>tnsping my10g

TNS Ping Utility for 32-bit Windows: Version 10.2.0.1.0 - Production on 12-3月-

2008 19:59:46

Copyright (c) 1997, 2005, Oracle. All rights reserved.

已使用的参数文件:

c:\oracle\product\10.2.0\db_1\network\admin\sqlnet.ora

已使用TNSNAMES 适配器来解析别名

Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = localhost)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = oracsjh)))

OK (20 毫秒)

TNSNAMES.ORA的内容如下：

MY10G =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = oracsjh)

)

)

listner.ora的内容如下：

# listener.ora Network Configuration File: c:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\listener.ora # Generated by Oracle configuration tools.

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC =

(SID_NAME = PLSExtProc)

(ORACLE_HOME = c:\oracle\product\10.2.0\db_1)

(PROGRAM = extproc)

)

(SID_DESC =

(GLOBAL_DBNAME = oracsjh)

(ORACLE_HOME = c:\oracle\product\10.2.0\db_1)

(SID_NAME = oracsjh)

)

)

LISTENER =

(DESCRIPTION_LIST =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(HOST = )(PORT = 1521)) )

(DESCRIPTION =

(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))

)

)

一再检查没发现什么问题啊，后来用OS认证的方式连到DB上一看才知道自己犯了一个很低级的错误。INSTANCE NAME跟两个配置文件的配置不一样。将oracsjh改为跟数据库INSTANCE名一样：sjhorac 问题解决。为了证实自己的想法，我又让问题重现：

TNSNAMES.ORA的内容如下：

MY10G =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = ABC)

)

)

listner.ora的内容如下：

# listener.ora Network Configuration File: c:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\listener.ora # Generated by Oracle configuration tools.

SID_LIST_LISTENER =

(SID_LIST =

(SID_DESC =

(SID_NAME = PLSExtProc)

(ORACLE_HOME = c:\oracle\product\10.2.0\db_1)

(PROGRAM = extproc)

)

(SID_DESC =