配置客户端 在步骤1中解压文件的目录下安装建立文件夹NETWORK/ADMIN两层目录，在ADMIN其中创建tnsnames.ora文件 文件中输入DB的连接字符串如： oradb = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.120.13)(PORT = 1521)) )
配置客户端
在步骤1中解压文件的目录下安装建立文件夹NETWORK/ADMIN两层目录，在ADMIN其中创建tnsnames.ora文件
文件中输入DB的连接字符串如：
oradb =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.120.13)(PORT = 1521))
)
(CONNECT_DATA =
(SID = oradb)
)
)
主要是配置DB服务器的IP地址和DB名称。相信使用过PL/SQL连接oracle的朋友都知道这个连接文件，就不再详述了。
3、下载安装PL/SQL Developer
下载正式版或是破解版的PL/SQL都可以，直接安装就可以了。注意：安装路径中不能有括号，不要安装在C:\Program Files (x86)目录下面
4、配置PL/SQL
4.1、无用户登录状态下打开PL/SQL
4.2、通过TOOLS菜单，打开Preference菜单项
4.3、修改Oracle Home和OCI Library路径如下图：
Oracle Home和OCI Library根据自己解压路径设置。
5、配置好以上四步后，重新打开PL/SQL，会出现如下登录画面，输入用户名和密码，就应该能正常登录了。
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oracle查询怎么不区分大小写May 10, 2022 pm 05:45 PM方法：1、利用“LOWER(字段值)”将字段转为小写，或者利用“UPPER(字段值)”将字段转为大写；2、利用“REGEXP_LIKE(字符串,正则表达式,'i')”，当参数设置为“i”时，说明进行匹配不区分大小写。
Oracle怎么修改sessionMay 13, 2022 pm 05:06 PM方法：1、利用“alter system set sessions=修改后的数值 scope=spfile”语句修改session参数；2、修改参数之后利用“shutdown immediate – startup”语句重启服务器即可生效。
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