oracle instantclient and plsql configuration

1. After downloading instantclient
, extract it to a certain folder,
such as : c:\instantclient11
Note that there can be no Chinese and no spaces in the path where the folder is located.
2. Add environment variables and create a
new c:\instantclient11\tnsnames.ora
The content of the file is as follows

orclaaaa =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.207)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SID = orcl)
    )
  )
orclbbbb =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.208)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SID = orcl)
    )
  )

Add environment variable
TNS_ADMIN=c:\instantclient11

3. Configure plsql

tools-->preference-->
                     oracle-->connection
                     oracle home c:\instantclient11
                     OCI library c:\instantclient11\oci.dll
                    
                     oracle-->logon history
                     store with Save the password
, reopen the plsql


instantclient sqlplus configuration,
download the instantclient-sqlplus-11.1.0.2.0 and
decompress it, copy the file to the c:\instantclient11

environment variable and add %TNS_ADMIN%

%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;%TNS_ADMIN%

Open the command line and log in to

sqlplus sys/oracle@orclaaaa as sysdba