Oracle Database Remote Connection

Question

I've been searching online for a solution to my problem without any luck. I'm trying to connect to a remote server (~ 700 km of distance), but since I'm new in this Database administration world I'm afraid of messing this up. So I've been practicing with a VirtualBox machine (Windows 7) on my Ubuntu real Machine for almost a week and nothing seems to work.

This are the steps that I'm following to achieve the connection:

ON SERVER SIDE:

• Start database: conn sys as sysdba.
• Start LISTENER: lsrnctl start on cmd.
• listener.ora:

listener.ora:

SID_LIST_LISTENER =
 (SID_LIST =
 (SID_DESC =
 (SID_NAME = PLSExtProc)
 (ORACLE_HOME = C:\oraclexe\app\oracle\product11円.2.0\xe)
 (PROGRAM = extproc)
 )
 (SID_DESC =
 (SID_NAME = CLRExtProc)
 (ORACLE_HOME = C:\oraclexe\app\oracle\product11円.2.0\xe)
 (PROGRAM = extproc)
 )
LISTENER =
 (DESCRIPTION_LIST =
 (DESCRIPTION =
 (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
 (ADDRESS = (PROTOCOL = TCP)(HOST = ServerHostName)(PORT = 1521))
 )
 )
DEFAULT_SERVICE_LISTENER = (XE)

tnsnames.ora:

XE =
 (DESCRIPTION =
 (ADDRESS = (PROTOCOL = TCP)(HOST = ServerHostName)(PORT = 1521))
 (CONNECT_DATA =
 (SERVER = DEDICATED)
 (SERVICE_NAME = XE)
 )
 )
EXTPROC_CONNECTION_DATA =
 (DESCRIPTION =
 (ADDRESS_LIST =
 (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
 )
 (CONNECT_DATA =
 (SID = PLSExtProc)
 (PRESENTATION = RO)
 )
 )
ORACLR_CONNECTION_DATA = 
 (DESCRIPTION = 
 (ADDRESS_LIST = 
 (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1)) 
 ) 
 (CONNECT_DATA = 
 (SID = CLRExtProc) 
 (PRESENTATION = RO) 
 ) 
 ) 

ON CLIENT SIDE:

tnsnames.ora:

SID_LIST_LISTENER =
 (SID_LIST =
 (SID_DESC =
 (SID_NAME = PLSExtProc)
 (ORACLE_HOME = /u01/app/oracle/product/11.2.0/xe)
 (PROGRAM = extproc)
 )
 )
LISTENER =
 (DESCRIPTION_LIST =
 (DESCRIPTION =
 (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
 (ADDRESS = (PROTOCOL = TCP)(HOST = ServerHostName)(PORT = 1521))
 )
 )
DEFAULT_SERVICE_LISTENER = (XE)

• Start oracle client: sudo service start oracle-xe start
• Try to connect: conn SYS/pass@HostName (tried with different users and host IP)

Please help!

Answer 1

Your connection string is wrong. With easy connect you need to provide a hostname and servicename/SID. In your case you would provide sqlplus user/"SomePass"@HOSTNAME:$PORT/servicename

If you want to configure your connection in the tnsnames.ora, you can connect to it using sqlplus user/"SomePass"@TNSALIAS

I actually don't understand the part of your question with your local Oracle XE installation. If you only want to connect to a remote database, you don't need it. All you need is an oracle Client (Instant Client with sqlplus will do fine), or a tool like SQLDeveloper. If you are unfamiliar with Database administration a tool like SQLDeveloper might make life a little bit easier.