1、下載Instant Client。下載完成後解壓該檔案。如：我將其解壓在E:\oracleClient\instantclient_11_2該路徑下。進入到instantclient_11_2下建立目錄NETWORK，然後再NETWORK下建立目錄ADMIN。在ADMIN目錄下建立tnsnames.ora檔案，在該tnsnames.ora檔案中新增如下內容：

LISTENER_ORCL =
  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))


ORACLR_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
    (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
    )
  )

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )
  )

128 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.48.128)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl.wtLinux)
    )
  )

2：環境變數的配置

安裝完成後進入PLSQL Developer，選擇tools->preferences->connection

Oracle Home             

E:\oracleClient\instantclient_11_2 或 E:\app\lijuan\product\11.2.0\dbhome_1（本機oracle安裝主目錄

OCI library

E:\oracleClient\instantclient_11_2\oci.dll

修改完畢後儲存並重啟PLSQL Developer就可以使用該工具了。