操作系統是Redhat Enterprise Linux 5.2，需連接數據庫，oracle安裝程序提供的客戶端太大了，有幾百M，如果只需要數據庫連接功能，可以使用instant client。下載以下3個包：

instantclient-basic-linux32-10.2.0.3-20061115.zip

instantclient-sdk-linux32-10.2.0.3-20061115.zip

instantclient-sqlplus-linux32-10.2.0.3-20061115.zip

sqlplus是用來檢驗是否安裝成功的。依次解壓，得到一個統一的文件夾，instantclient_10_2。如我前面的文章DBArtisan無法加載OCI，配置好TNS_ADMIN、LD_LIBRARY_PATH等，復制.bashrc文件部分內容如下：

export ORACLE_HOME=/usr/local/oracle

export TNS_ADMIN=$ORACLE_HOME/NETWORK/ADMIN

export LD_LIBRARY_PATH=$ORACLE_HOME

export SQLPATH=$ORACLE_HOME

export NLS_LANG=AMERICAN_AMERICA.ZHS16GBK

PATH=$PATH:$ORACLE_HOME

export PATH

找一個配置好的tnsnames.ora文件放到TNS_ADMIN變量設置的位置，也就是/usr/local/oracle/NETWORK/ADMIN目錄下。接下來就可以使用sqlplus驗證是否安裝成功。當我使用如下命令：sqlplus username/password@測試時，系統提示段錯誤 (segmentation fault)。有提示解決方法如下：

1. cd /usr/bin (as root)

2. mv gcc gcc.script

3. mv g++ g++.script

4. ln -s gcc32 gcc

5. ln -s g++32 g++

6. login as oracle software owner (make sure environment is correct)

7. cd $ORACLE_HOME/bin

8. relink all

首先，這個是64位系統的解決方法，其次，我在當前linux系統中找不到relink命令。后來，傳說中的高人又出現了，一頓檢查以后，得出結論如下，這個linux的內核版本太高了，instant client這個版本可能還不支持，于是建議安裝instant client 11。

下載如下文件：

instantclient-basic-linux32-11.2.0.1.zip

instantclient-sdk-linux32-11.2.0.1.zip

instantclient-sqlplus-linux32-11.2.0.1.zip

操作步驟與上面一樣，其實配置已經做好了，只需將原來instant client 的文件都刪除，替換成instant client 11的文件就行。再使用sqlplus測試，連接成功。

以下是討論不設置環境變量安裝Oracle instant client的內容，先記錄下來，有空再嘗試。

Oracle's instructions specify setting LD_LIBRARY_PATH. This makes my application dependent on random users' configuration and is very troublesome to set up.

How can I avoid having to set any environment variables?

answer:Add the library path to /etc/ld.so.conf, then run /sbin/ldconfig. You don't need to set LD_LIBRARY_PATH for libraries installed in standard locations like /usr/lib because these locations are already configured in /etc/ld.so.conf.

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Oracle's instantclient installation instructions specify that the user set LD_LIBRARY_PATH. This is very troublesome to manage for multiple users.

To use the instantclient without setting any environment variables:

Download the instantclient distribution from oracle.com. For doing non-java software development, you will need (assuming Oracle 10.2): instantclient-basic-linux-x86_64-10.2.0.4.0.zip

instantclient-sdk-linux-x86_64-10.2.0.4.0.zip

instantclient-sqlplus-linux-x86_64-10.2.0.4.0.zip

Unzip the three files. This will give you a directory instantclient_10_2/

Copy the files to /usr, which is one of the default places the dynamic loader searches. sudo cp instantclient_10_2/sdk/include/*.h /usr/include

sudo cp instantclient_10_2/sqlplus ? ? ? ? /usr/bin

sudo cp instantclient_10_2/*.so* ? ? ? ? ? /usr/lib

If you use tnsnames.ora, copy it to /etc, which is the default global place the oracle runtime searches. sudo cp tnsnames.ora /etc

Test with /usr/bin/sqlplus scott/tiger@myoracle

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You could of course rename sqlplus to sqlplus.real and make a wrapper script: #!/bin/sh

if [ "$LD_LIBRARY_PATH" = "" ]

then

LD_LIBRARY_PATH=/what/ever

else

LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/what/ever

fi

export LD_LIBRARY_PATH

exec sqlplus.real ${1+"$@"}

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For anyone playing with Solaris (like me!) coming from a Linux background, I found that @David Phillips solution worked well using the Solaris command crle -u -l /opt/instantclient

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