Listener&tnsnames.ora

Question

i'm verymuch confused is server/client configuration,
i need you people's help,
i have posted both server/clients Listener&tnsnames.ora,
which i configured.
server listener.ora(test1)
SID_LIST_LISTENER =
*(SID_LIST =*
*(SID_DESC =*
*(SID_NAME = PLSExtProc)*
*(ORACLE_HOME = D:\oracle\product\10.2.0\db_1)*
*(PROGRAM = extproc)*
*(SID_DESC =*
*(GLOBAL_DBNAME = TEST1)*
*(ORACLE_HOME = D:\oracle\product\10.2.0\db_1)*
*(SID_NAME = TEST1)*
TEST1 =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop029.tvsil.com)(PORT = 1521))*
SID_LIST_ORCL =
*(SID_LIST =*
*(SID_DESC =*
*(GLOBAL_DBNAME = TEST1)*
*(ORACLE_HOME = D:\oracle\product\10.2.0\db_1)*
*(SID_NAME = TEST1)*
LISTENER =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))*
ORCL =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop041.tvsil.com)(PORT = 1522))*
server tnsnames.ora
TEST1 =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop029.tvsil.com)(PORT = 1521))*
*(CONNECT_DATA =*
*(SERVER = DEDICATED)*
*(SERVICE_NAME = TEST1)*
orcl =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop041.tvsil.com)(PORT = 1522))*
*(CONNECT_DATA =*
*(SERVICE_NAME = orcl)*
EXTPROC_CONNECTION_DATA =
*(DESCRIPTION =*
*(ADDRESS_LIST =*
*(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))*
*(CONNECT_DATA =*
*(SID = PLSExtProc)*
*(PRESENTATION = RO)*
client listener.ora(orcl)
SID_LIST_LISTENER =
*(SID_LIST =*
*(SID_DESC =*
*(SID_NAME = PLSExtProc)*
*(ORACLE_HOME = E:\Sample1oracle\product\10.2.0\db_2)*
*(PROGRAM = extproc)*
LISTENER =
*(DESCRIPTION_LIST =*
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop041.tvsil.com)(PORT = 1523))*
*(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))*
ORCL =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop041.tvsil.com)(PORT = 1522))*
TEST1 =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop029.tvsil.com)(PORT = 1521))*
Client tnsnames.ora
LISTENER_TEST1 =
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop029.tvsil.com)(PORT = 1521))*
TEST1 =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop029.tvsil.com)(PORT = 1521))*
*(CONNECT_DATA =*
*(SERVER = DEDICATED)*
*(SERVICE_NAME = TEST1)*
ORCL =
*(DESCRIPTION =*
*(ADDRESS_LIST =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = desktop041.tvsil.com)(PORT = 1522)))*
*(CONNECT_DATA =*
*(SERVICE_NAME = orcl)*
EXTPROC_CONNECTION_DATA =
*(DESCRIPTION =*
*(ADDRESS_LIST =*
*(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC2))*
*(CONNECT_DATA =*
*(SID = PLSExtProc)*
*(PRESENTATION = RO)*
*)*

Answer 1

user11345217 wrote:
i'm verymuch confused is server/client configuration,
i need you people's help,
i have posted both server/clients Listener&tnsnames.ora,
which i configured.
server listener.ora(test1)
SID_LIST_LISTENER =
*(SID_LIST =*
*(SID_DESC =*
*(SID_NAME = PLSExtProc)*
*(ORACLE_HOME = D:\oracle\product\10.2.0\db_1)*
*(PROGRAM = extproc)*
*(SID_DESC =*
*(GLOBAL_DBNAME = TEST1)*
*(ORACLE_HOME = D:\oracle\product\10.2.0\db_1)*
*(SID_NAME = TEST1)*
TEST1 =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop029.tvsil.com)(PORT = 1521))*
SID_LIST_ORCL =
*(SID_LIST =*
*(SID_DESC =*
*(GLOBAL_DBNAME = TEST1)*
*(ORACLE_HOME = D:\oracle\product\10.2.0\db_1)*
*(SID_NAME = TEST1)*
LISTENER =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))*
ORCL =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop041.tvsil.com)(PORT = 1522))*
Well, that is certainly the most, uh, <i>interesting</i> listener.ora I've ever seen .... where did you come up with all that?
server tnsnames.ora
TEST1 =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop029.tvsil.com)(PORT = 1521))*
*(CONNECT_DATA =*
*(SERVER = DEDICATED)*
*(SERVICE_NAME = TEST1)*
orcl =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop041.tvsil.com)(PORT = 1522))*
*(CONNECT_DATA =*
*(SERVICE_NAME = orcl)*
EXTPROC_CONNECTION_DATA =
*(DESCRIPTION =*
*(ADDRESS_LIST =*
*(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))*
*(CONNECT_DATA =*
*(SID = PLSExtProc)*
*(PRESENTATION = RO)*
client listener.ora(orcl)
<snip>A listener.ora on the client makes as much sense as a radiator on a 1965 Volkswagen. The listener is strictly a server-side process. It's whole reason for living is to "listen" (hence its name) for connection requests.
Client tnsnames.ora
LISTENER_TEST1 =
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop029.tvsil.com)(PORT = 1521))*
TEST1 =
*(DESCRIPTION =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = Desktop029.tvsil.com)(PORT = 1521))*
*(CONNECT_DATA =*
*(SERVER = DEDICATED)*
*(SERVICE_NAME = TEST1)*
ORCL =
*(DESCRIPTION =*
*(ADDRESS_LIST =*
*(ADDRESS = (PROTOCOL = TCP)(HOST = desktop041.tvsil.com)(PORT = 1522)))*
*(CONNECT_DATA =*
*(SERVICE_NAME = orcl)*
EXTPROC_CONNECTION_DATA =
*(DESCRIPTION =*
*(ADDRESS_LIST =*
*(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC2))*
*(CONNECT_DATA =*
*(SID = PLSExtProc)*
*(PRESENTATION = RO)*
*)*OK, let's clear a few things up.
First, as mentioned, the listener is purely a client-side process. Hence there is no use of a listener.ora on the client.
Second, a single listener, listening on a single port, can service multiple databases of multiple versions running from multiple oracle homes. It listens for a connection, sets it up (on a different port than its listening on) and is then out of the picture for that connection. It establishes the connection, but does not sustain it. Your listener.ora is far more complex (dare I say convoluted) than need be.
On the client side (and the server can also act as a client), the tnsnames.ora serves the purpose of resolving a an alias (a tns service name) to an actual destination on the network.
Assume you have the following in your tnsnames.ora:
larry =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = myhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVICE_NAME = curley)
  )Now, when you issue a connect, say like this:
$> sqlplus scott/tiger@larrytns will look in your tnsnames.ora for an entry called 'larry'. Next, tns sends a request to (PORT = 1521) on (HOST = myhost) using (PROTOCOL = TCP), asking for a connection to (SERVICE_NAME = curley).
Where is (HOST = myhost) on the network? When the request gets passed from tns to the next layer in the network stack, the name 'myhost' will get resolved to an IP address, either via a local 'hosts' file, via DNS, or possibly other less used mechanisms. You can also hard-code the ip address (HOST = 123.456.789.101) in the tnsnames.ora.
Next, the request arrives at (PORT = 1521) on (HOST = myhost). Hopefully, there is a listener on myhost configured to listen on (PORT = 1521), and that listener knows about (SERVICE_NAME = curley). If so, you'll be connected.
What can go wrong?
First, there may not be an entry for 'larry' in your tnsnames. In that case you get "ORA-12154: TNS:could not resolve the connect identifier specified" No need to go looking for a problem on the host, with the listener, etc. If you can't place a telephone call because you don't know the number (can't phone your telephone directory or can't find the party you are looking for listed in it) you don't look for problems at the telephone switchboard.
Maybe the entry for larry was found, but myhost couldn't be resolved to an IP address (say there was no entry for myhost in the local hosts file). This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe there was an entry for myserver in the local hosts file, but it specified a bad IP address. This will result in "ORA-12545: Connect failed because target host or object does not exist"
Maybe the IP was good, but there is no listener running: "ORA-12541: TNS:no listener"
Maybe the IP was good, there is a listener at myhost, but it is listening on a different port. "ORA-12560: TNS:protocol adapter error"
Maybe the IP was good, there is a listener at myhost, it is listening on the specified port, but doesn't know about SERVICE_NAME = curley. "ORA-12514: TNS:listener does not currently know of service requested in connect descriptor"