在客戶服務(wù)器上嘗試登錄數(shù)據(jù)庫是碰到錯(cuò)誤。

步驟如下：

> sqlplus /nolog

SQL*Plus: Release 10.2.0.1.0 - Production ON Thu Nov 17 17:24:16 2011

Copyright (c) 1982, 2005, Oracle. ALL rights reserved.

SQL> conn / AS sysdba

ERROR:

ORA-12545: CONNECT failed because target host OR object does NOT exist

SQL> conn USER/password

ERROR:

ORA-12545: CONNECT failed because target host OR object does NOT exist

SQL> conn USER/password@100.300.100.200/db

Connected.

> sqlplus /nolog

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Nov 17 17:24:16 2011

Copyright (c) 1982, 2005, Oracle. All rights reserved.

SQL> conn / as sysdba

ERROR:

ORA-12545: Connect failed because target host or object does not exist

SQL> conn user/password

ERROR:

ORA-12545: Connect failed because target host or object does not exist

SQL> conn user/password@100.300.100.200/db

Connected.

嘗試連接本地的數(shù)據(jù)庫，結(jié)果出現(xiàn)了ORA-12545錯(cuò)誤，嘗試通過網(wǎng)絡(luò)方式連接，反而沒有碰到問題。這說明數(shù)據(jù)庫本身是正常的，而本地?zé)o法連接，顯示是本地設(shè)置出現(xiàn)了問題。

檢查了環(huán)境變量的設(shè)置，包括ORACLE_SID、ORACLE_HOME和PATH，都未發(fā)現(xiàn)任何異常，再次嘗試連接數(shù)據(jù)庫：

> sqlplus USER/password@100.300.100.200/db

SQL*Plus: Release 10.2.0.1.0 - Production ON Thu Nov 17 17:26:54 2011

Copyright (c) 1982, 2005, Oracle. ALL rights reserved.

Connected TO:

Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production

WITH the Partitioning, OLAP AND Oracle DATA Mining options

JServer Release 9.2.0.4.0 - Production

SQL> exit

Disconnected FROM Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production

WITH the Partitioning, OLAP AND Oracle DATA Mining options

JServer Release 9.2.0.4.0 - Production

> sqlplus user/password@100.300.100.200/db

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Nov 17 17:26:54 2011

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:

Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.4.0 - Production

SQL> exit

Disconnected from Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.4.0 - Production

這次同樣連接到數(shù)據(jù)庫，但是由于連接方式和第一次的不同，通過Oracle提示的信息找到了錯(cuò)誤的原因。

首先嘗試的簡易連接方式是10g的新特性，而且從sqlplus的工具版本信息也可以看得出，sqlplus是10.2.0.1版本的。而連接到數(shù)據(jù)庫后顯示的數(shù)據(jù)庫服務(wù)器版本信息卻是9.2.0.4。

顯然當(dāng)前是通過一個(gè)10.2的sqlplus客戶端，連接到9.2的數(shù)據(jù)庫。那么無論ORACLE_HOME還是PATH都是指向10.2的客戶端的，這就是為什么出現(xiàn)ORA-12545錯(cuò)誤的原因：

[DEV]dev:/app/oracle/product

> export ORACLE_HOME=/app/oracle/product/920

[DEV]dev:/app/oracle/product

> export PATH=$ORACLE_HOME/bin:$PATH

[DEV]dev:/app/oracle/product

> sqlplus '/ as sysdba'

SQL*Plus: Release 9.2.0.4.0 - Production ON Thu Nov 17 17:28:41 2011

Copyright (c) 1982, 2002, Oracle Corporation. ALL rights reserved.

Connected TO:

Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production

WITH the Partitioning, OLAP AND Oracle DATA Mining options

JServer Release 9.2.0.4.0 - Production

SQL>

[DEV]dev:/app/oracle/product

> export ORACLE_HOME=/app/oracle/product/920

[DEV]dev:/app/oracle/product

> export PATH=$ORACLE_HOME/bin:$PATH

[DEV]dev:/app/oracle/product

> sqlplus '/ as sysdba'

SQL*Plus: Release 9.2.0.4.0 - Production on Thu Nov 17 17:28:41 2011

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.

Connected to:

Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.4.0 - Production

SQL>

定位問題的原因，解決就很簡單了，設(shè)置ORACLE_HOME和PATH到9.2對應(yīng)的目錄后，在本地sqlplus成功連接數(shù)據(jù)庫。

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