前言
先赞后看，此生必赚！
每次安装Oracle以后，都会出现使用plsql连接不上的问题！多次重启电脑、重装系统的磨人经历之后，
有木有想说句 TMD 平复一下心情？
先别骂！今天看到这篇文章算是你我之幸！希望能帮助广大技术人员减少一些时间，顺利进行连接！
注：也可以用plsql连接远程数据库（只要有oracle的network\admin\tnsnames.ora就行）。
首先下载64位oracle以及32位轻量级客户端(注意版本的对应，我用的是11g的oracle和11.2的客户端)：
点击进入oracle下载页面 点击进入客户端下载页面
以下步骤请自行更改路径，不然，出错了别怪我哦：
step1 复制network文件
oracle安装到某路径下，安装步骤很简单，网上可以搜到！
客户端随便解压到一个路径，我的是放在D:\app\shuhao\instantclient_11_2了。
然后把oracle中的D:\app\shuhao\product\11.2.0\dbhome_1里面的整个network文件夹复制，
粘贴到客户端文件夹D:\app\shuhao\instantclient_11_2下面，如下图所示：
step2 修改配置文件
2.1 修改oracle数据库文件
D:\app\shuhao\product\11.2.0\dbhome_1\NETWORK\ADMIN\listener.ora文件内容，添加一个SID_DESC：
# listener.ora Network Configuration File: D:\app\shuhao\product\11.2.0\dbhome_1\network\admin\listener.ora # Generated by Oracle configuration tools. SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (SID_NAME = CLRExtProc) (ORACLE_HOME = D:\app\shuhao\product\11.2.0\dbhome_1) (PROGRAM = extproc) (ENVS = "EXTPROC_DLLS=ONLY:D:\app\shuhao\product\11.2.0\dbhome_1\bin\oraclr11.dll") ) #下面的SID_DESC是新增加的内容，注意修改ORACLE_HOME路径 (SID_DESC = (SID_NAME = orcl) (ORACLE_HOME = D:\app\shuhao\product\11.2.0\dbhome_1) (GLOBAL_DBNAME = orcl) ) ) LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) ) ) ADR_BASE_LISTENER = D:\app\shuhao
2.2 修改oracle数据库文件
D:\app\shuhao\product\11.2.0\dbhome_1\NETWORK\ADMIN\tnsnames.ora文件内容，源文件没有做改动：
# tnsnames.ora Network Configuration File: D:\app\shuhao\product\11.2.0\dbhome_1\network\admin\tnsnames.ora # Generated by Oracle configuration tools. ORACLR_CONNECTION_DATA = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = orcl) ) ) LISTENER_ORCL = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) )
2.3 修改客户端文件
D:\app\shuhao\instantclient_11_2\network\admin\tnsnames.ora文件内容:
# tnsnames.ora Network Configuration File: D:\app\shuhao\product\11.2.0\dbhome_1\network\admin\tnsnames.ora # Generated by Oracle configuration tools. ORACLR_CONNECTION_DATA = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = orcl) ) ) LISTENER_ORCL = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) ) #新增 @ 标识符，用于区分本地与远程oracle ORCL@192.168.0.164 = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.164)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) )
step3 配置OCI
不登录plsql，直接按Cancel，进入后在Tools--->Preferences---->Connection中配置OCI为32位客户端的OCI
D:\app\shuhao\instantclient_11_2\oci.dll
step4 环境变量配置
添加前2个系统变量：
1. 变量名：TNS_ADMIN
变量值：D:\app\shuhao\instantclient_11_2\network\admin
2. 变量名：NLS_LANG
变量值：SIMPLIFIED CHINESE_CHINA.ZHS16GBK
3. Path中配置加入：
D:\app\shuhao\product\11.2.0\dbhome_1\BIN;D:\app\shuhao\instantclient_11_2;
step5 重启电脑（有时候不需要重启）
启动oracle服务与监听，这个就不需要描述了。
step6 登录plsql！！！
当看到Database下拉框中有本地的ORCL以及远程的ORCL@192.168.0.164就算成功了！！！
