前言

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，终于做出这么一篇文章，希望能帮助广大技术人员减少一些时间，顺利进行连接。

注：不安装oracle，可以用plsql连接远程数据库（只要有oracle的network文件夹就行）。

本文主要讲述如何连接本地oracle数据库或者远程oracle数据库，实现随意切换。

注：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

安装步骤很简单，网上可以搜到！

oracle安装到某路径下，

客户端随便解压到一个路径，我的是放在D:appshuhaoinstantclient_11_2了。

然后把oracle中的D:appshuhaoproduct11.2.0dbhome_1里面的整个network文件夹复制，

粘贴到客户端文件夹D:appshuhaoinstantclient_11_2下面，如下图所示：

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step2 修改配置文件

2.1  修改oracle数据库文件

D:appshuhaoproduct11.2.0dbhome_1NETWORKADMINlistener.ora文件内容，添加一个SID_DESC：

# listener.ora Network Configuration File: D:appshuhaoproduct11.2.0dbhome_1networkadminlistener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = D:appshuhaoproduct11.2.0dbhome_1)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:D:appshuhaoproduct11.2.0dbhome_1binoraclr11.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:appshuhaoproduct11.2.0dbhome_1)
      (GLOBAL_DBNAME = orcl)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
  )

ADR_BASE_LISTENER = D:appshuhao

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2.2  修改oracle数据库文件

D:appshuhaoproduct11.2.0dbhome_1NETWORKADMINtnsnames.ora文件内容，源文件没有做改动：

# tnsnames.ora Network Configuration File: D:appshuhaoproduct11.2.0dbhome_1networkadmintnsnames.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)
    )
  )

===========================分割线==========================

2.3  修改客户端文件

D:appshuhaoinstantclient_11_2networkadmintnsnames.ora文件内容:

# tnsnames.ora Network Configuration File: D:appshuhaoproduct11.2.0dbhome_1networkadmintnsnames.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:appshuhaoinstantclient_11_2oci.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:appshuhaoinstantclient_11_2networkadmin

2. 变量名：NLS_LANG

    变量值：SIMPLIFIED CHINESE_CHINA.ZHS16GBK

3. Path中配置加入：

D:appshuhaoproduct11.2.0dbhome_1BIN;D:appshuhaoinstantclient_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！！！

OK, GAME OVER !

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