Sqlplus not find tnsnames.ora

Hey guys,.

I have a question about oracle client and the tnsnames.ora file. Basically, I have the customer put in place and it seems to work on the use of sqldeveloper such that she can see the tnsnames.ora file in the drop-down list but I don't seem to be able to connect using sql, which makes me think that it cannot find the file ora. I set the env as:
DON@donkeyhome:/usr/lib/oracle$ echo $PATH
.:/usr/lib/oracle/oracle_client/bin:.:/usr/lib/jvm/jdk/bin:/usr/lib/jvm/jdk/jre/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
DON@donkeyhome:/usr/lib/oracle$ echo $ORACLE_HOME
/usr/lib/oracle/oracle_client
DON@donkeyhome:/usr/lib/oracle$ echo $TNS_ADMIN
/usr/lib/oracle/network/admin
DON@donkeyhome:/usr/lib/oracle$
Sql developer seems to work with the tns ok but not sqlplus:

DON@donkeyhome:/usr/lib/oracle$ sqlplus SYSADM@STUDA1

SQL*Plus: Release 10.2.0.1.0 - Production on Tue Jan 6 16:26:50 2009

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
Any help with this would be greatly appreciated that I had this problem and commented on many forums for about 1 month now :(

Dave was soon

Published by: wheelie on January 5, 2009 22:28

Published by: wheelie on January 7, 2009 22:32

Wheelie,

I understand that you have tried many options to solve and in general, this mistake is easy to correct. Bad especially as a tnsnames.ora entry, you can also try dos2unix tnsnames.ora see if it removes all special characters and it changes size.

Concerns

Tags: Database

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LISTENERS_RAC =
  (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.mydomain.com)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.mydomain.com)(PORT = 1521))
  )

RAC2 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.mydomain.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = rac)
      (INSTANCE_NAME = rac2)
    )
  )

RAC1 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.mydomain.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = rac)
      (INSTANCE_NAME = rac1)
    )
  )

HRSERV =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.mydomain.com)(PORT = 1521))
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.mydomain.com)(PORT = 1521))
    (LOAD_BALANCE = yes)
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = hrserv)
      (FAILOVER_MODE =
        (TYPE = SESSION)
        (METHOD = BASIC)
        (RETRIES = 180)
        (DELAY = 5)
      )
    )
  )

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )

    Srvctl manages the CRS (OCR), but does not alter the tnsnames.ora.

    You can use netca to manage tnsnames.ora, but personally, I find it easier to manually edit the entries.

  • Net Oracle does not read the tnsnames.ora file.

    I am running 11.2.0.3 on Solaris 10 SPARC x 64. I'm trying to configure oracle net for a new database on hold in order to be able to use rman duplicate to create. LDAP is what we mainly use for all of our connections and, possibly, what I could use very well for my goal of rman duplication. But, I fear that I do nothing seems to allow me to read the tnsnames.ora file.

    My SQLNET. ORA file is as follows:

    NAMES. DIRECTORY_PATH = (LDAP, TNSNAMES)

    NAMES. DEFAULT_DOMAIN = mydomain.com

    My TNSNAMES file. ORA file is as follows on both servers:

    WLDB_HERE =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = primary_server) (PORT = 1521))
    )
    (CONNECT_DATA = (SERVICE_NAME = wldb_here.mydomain.com))
    )

    WLDB_THERE =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = standby_server) (PORT = 1521))
    )
    (CONNECT_DATA = (SERVICE_NAME = wldb_there.mydomain.com))
    )

    I have a static entry in the remote listener.ora file so I can connect to create the instance:

    SID_LIST_LISTENER =
    (SID_LIST =
    (SID_DESC =
    (GLOBAL_DBNAME = wldb_there.mydomain.com)
    (ORACLE_HOME = / u01/app/oracle/product/OraHome112)
    (SID_NAME = WJZI)
    )
    )

    LISTENER =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = standby_server) (PORT = 1521))
    )

    Permissions on my .ora files in $ORACLE_HOME/network/admin are

    -rw - r - r - 1 oracle dba

    The user that I am connected to who is oracle.

    I have set up several times before, but for some reason that I can't get this to work. I get

    AMT-03505: failed to resolve host

    Of

    tnsping wldb_there

    or

    tnsping wldb_here

    I have not tried to take the LDAP Protocol on my sqlnet.ora because I need, but I really want to know if anyone has had an experience like this before.

    Thank you-

    gregb wrote:

    I am running 11.2.0.3 on Solaris 10 SPARC x 64. I'm trying to configure oracle net for a new database on hold in order to be able to use rman duplicate to create. LDAP is what we mainly use for all of our connections and, possibly, what I could use very well for my goal of rman duplication. But, I fear that I do nothing seems to allow me to read the tnsnames.ora file.

    My SQLNET. ORA file is as follows:

    NAMES. DIRECTORY_PATH = (LDAP, TNSNAMES)

    NAMES. DEFAULT_DOMAIN = mydomain.com

    My TNSNAMES file. ORA file is as follows on both servers:

    WLDB_HERE =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = primary_server) (PORT = 1521))
    )
    (CONNECT_DATA = (SERVICE_NAME = wldb_here.mydomain.com))


    )

    Because you have NAMES. DEFAULT_DOMAIN = mydomain.com in your sqlnet.ora, when you try to connect to "WLDB_HERE", before tnsnames.ora is read, sqlnet will transform your application in "WLDB_HERE.mydomain.com".  And that's what he's going to get.

    You do not have an entry in your tnsnames.ora to 'WLDB_HERE.mydomain.com '.

    WLDB_THERE =
    (DESCRIPTION =
    (ADDRESS_LIST =
    (ADDRESS = (PROTOCOL = TCP)(HOST = standby_server) (PORT = 1521))
    )
    (CONNECT_DATA = (SERVICE_NAME = wldb_there.mydomain.com))
    )

    I have a static entry in the remote listener.ora file so I can connect to create the instance:

    SID_LIST_LISTENER =
    (SID_LIST =
    (SID_DESC =
    (GLOBAL_DBNAME = wldb_there.mydomain.com)
    (ORACLE_HOME = / u01/app/oracle/product/OraHome112)
    (SID_NAME = WJZI)
    )
    )

    LISTENER =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = standby_server) (PORT = 1521))
    )

    Permissions on my .ora files in $ORACLE_HOME/network/admin are

    -rw - r - r - 1 oracle dba

    The user that I am connected to who is oracle.

    I have set up several times before, but for some reason that I can't get this to work. I get

    AMT-03505: failed to resolve host

    Of

    tnsping wldb_there

    or

    tnsping wldb_here

    I have not tried to take the LDAP Protocol on my sqlnet.ora because I need, but I really want to know if anyone has had an experience like this before.

    Thank you-

  • connect sqlplus without tnsnames.ora

    Hello

    I have nothing in tnsnames.ora locally.
    I don't have a local instance of the DB, I always have to connect to an instance on a server. How can I connect using sqlplus?
    sqlplus [email protected]:1521/MYSID
    The result is ORA-12514!

    connect without tnsnames.ora. For example:

    sqlplus scott/tiger @(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(Host=server_a) (Port = 1521)) (CONNECT_DATA = (SID = db_a)))

  • EM does not create entry tnsnames.ora with service name orcl11gr2

    Hi all

    I am trying to create a service network with EM Database Control, Net Services Administration link name. On the service name field, under the "Edit Net Service Name" screen, I type in orcl11gr2, and it throws the following error:

    Validation error
    Review and correct the following errors, and then try again:
    Service name - specify a valid service name.

    I wonder what is the additional validation that checks EM. I guess it's to check the number of characters to 8 characters or less.

    In addition, because of this additional validation that is in MS, all entry tnsnames.ora with service name = orcl11gr2, I won't be able to use 'EM to change, as I have the same error.

    But why Oracle implements this additional validation when the same validation is not implemented on other Oracle tools? For example:
    1 dbca allows me to create a database with instance_name greater than 8 characters, and the results of the initialization parameters will be as follows:
    db_name = orcl11gr - truncated to 8 characters
    instance_name = orcl11gr2
    db_unique_name = orcl11gr2
    noms_service = orcl11gr2

    2 oracle Net Manager supports the name of orcl11gr2. The name of the created Service Net, I have no problem connecting to the database.
    3. name of the service orcl11gr2 of listener support

    I am using Oracle 11 g R2 (11.2.0.1.0) for Microsoft Windows (x 64), running on Windows 7.

    Its a known issue fixed 12gc Ms.

    concerning
    Bennett

  • Need PMON use tnsnames.ora to find no-DEFAULT listener?

    Hello

    I just want to confirm that because it is said tnsnames.ora used only for the customer. So I'm a bit confused by this use.
    Please give some explanations about this.


    Thanks in advance.

    BR
    Martin

    I know from experience as well - when I put in place LOCAL_LISTENER and REMOTE_LISTENER in 9iRAC.

    It is quite simple in 11.2 documentation:

    http://download.Oracle.com/docs/CD/E11882_01/server.112/e17110/initparams116.htm#i1128493

    «+ LOCAL_LISTENER specifies a network name that resolves to an address or a list of addresses of Oracle Net local listeners (i.e. listeners who are running on the same computer as this instance).» The address or the address list is specified in the TNSNAMES file. ORA file or another trustee address configured for your system. » +

    http://download.Oracle.com/docs/CD/E11882_01/server.112/e17110/initparams206.htm#i1132970

    "+ REMOTE_LISTENER specifies a network name that resolves to an address or a list of addresses of listeners distance Oracle Net (i.e. the listeners that are not running on the same machine as this instance). The address or the address list is specified in the TNSNAMES file. "ORA file or another trustee address configured for your system.

    I believe that earlier versions of the document indicate clearly that the 'address or address list of Oracle Net remote listeners' carried out since the tnsnames.ora. There was a few messages from forums on this confusion over the years.

    Hemant K Collette

    Published by: Hemant K grapple on May 25, 2011 10:53

  • customer will not use the correct tnsnames.ora file

    Hello all, I installed oracle 10g client on my machine... but here's the thing... I tnsnames.ora several file on my machine (which I can't delete or play with)... and because of this oracle is not able to connect to the database I want it to connect to... I can't do tnsping to the database... is there a way where I can point my client to use a specific tnsnames.ora file? as a pointer? or something where it will look in this file specific tnsnsame.ora?

    You can specify what tnsnames.ora for use the TNS_ADMIN environment variable
    Switch to the directory that contains your tnsnames.ora to use.

    Kind regards
    Uwe

    http://uhesse.WordPress.com

  • Another Post on 'could not resolve identifier' ORA-12154

    Hi experts,

    A new installation of 11g and I CAN connect to the database via SQLPlus but I get ORA-12154 error when you try to connect through RMAN.

    I used the EZCONNECT parameter in netca

    SQLNET. ORA NAMES_DIRECTORY_PATH a = (EZCONNECT)


    Any ideas for what I can check, please?

    Thank you, John

    user629010 wrote:
    Hi experts,

    A new installation of 11g and I CAN connect to the database via SQLPlus but I get ORA-12154 error when you try to connect through RMAN.

    I used the EZCONNECT parameter in netca

    SQLNET. ORA NAMES_DIRECTORY_PATH a = (EZCONNECT)

    Any ideas for what I can check, please?

    Thank you, John

    The connection string, you really used to connect knowing would have been helpful...

    =================================
    ORA-12154: TNS: could not resolve the connect identifier specified

    This error means one thing and one thing only. The customer couldn't find the entry specified in the tnsnames.ora file being used.

    Following this statement, remember that when you use a dblink, the database that defines the link acts as a client to the database that is the target of the link. So in this case, the tnsnames.ora on the host of your source file must have an entry for your db target, as defined in the db_link.

    And for the umpteenth time... This error has NOTHING to do with the status of a listener. The connection request never got far enough to reach a listener. If someone tells you to check a listener in response to ora-12154, they do not pay attention, or do not understand how works the TNS. This error is equivalent to not be able to place a phone call because you do not know the number of the part you want to reach. You would not debug this situation by going to the home of the other guy and test his phone, or by accessing the phone company and the standard test. And you are debugging an ORA-12154 by checking the listener. If I had a list of ten albums of 'Incredibly Simple Concepts (tm)' which must be burned in the brain of anyone claiming to be an Oracle DBA, it would include "ORA-12154 has nothing to do with the listener.

    =================================

    Suppose 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@larry

    TNS will appear in your tnsnames.ora for an entry called "larry". Then, tns sends a request to (PORT = 1521) on (HOST = myhost) to aid (PROTOCOL = TCP), requesting a connection to (SERVICE_NAME = curley).

    Where's (HOST = myhost) on the network? When the request is passed to tns to the next layer in the network stack, the name "myhost" resolves to an IP address, either via a file 'hosts' local, through DNS, or possibly other mechanisms being used less. Alternatively, you can hard-code the IP (HOST = 123.456.789.101) in the tnsnames.ora.

    Then, the request arrives at port 1521 myhost. If all goes well, there is a listener on myhost configured to listen on port 1521, and this listener knows SERVICE_NAME = curley. If so, you'll be connected.

    A few important points.

    First, the listener is a process only server-side . It's all in life seeks applications for reception for connections to the databases and set up these connections. Once the connection is established, the listener is out of the picture. It creates the connection. Is not maintain the connection. A listener, linking an oracle of the House, listening on a single port, use multiple instances of database in several versions of several houses. It is unnecessary complexity to try to have several headphones. It's like the telephone company, to build a separate table for each customer.

    Secondly, the tnsnames.ora file is a problem on the client side . Its purpose is to address resolution - the equivalent of the 'hosts' file tns further to the bottom of the network stack. The only reason it exists on a host computer is because this machine also can run client processes.

    What can go wrong?

    First, there may not be an entry for 'larry' in your tnsnames file. In this 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 cannot place a phone call because you do not know the number (cannot find your phonebook (tnsnames.ora) or can not find the party looking for listed in it (no entry for larry)) you don't look at problems at the switchboard.

    Perhaps the entry for larry was found, but myhost could not be resolved to an IP address (for example there is no entry for myhost in the local hosts file). This will mean by "ORA-12545: Connect failed because target host or object does not exist.

    Maybe there is an entry for MyServer in the local hosts file, but it specified a bad IP address. This will mean by "ORA-12545: Connect failed because target host or object does not exist.

    Maybe the INVESTIGATION period was good, but there is no listener running: "ORA-12541: TNS:no listener.

    Maybe the INVESTIGATION period was good, there is a listener to myhost, but he is listening on a different port. "ORA-12560: TNS:protocol adapter error.

    Maybe the INVESTIGATION period was good, there is a listener to myhost, listening on the specified port, it's unknown SERVICE_NAME = curley. "ORA-12514: TNS:listener is not currently of service requested in connect descriptor.

  • Earphone & tnsnames.ora

    I'm confused verymuch is a client/server configuration.
    I need help you popular.
    I posted the two clients/server listener & tnsnames.ora,.
    that I set up.

    Server listener.ora (test1)

    SID_LIST_LISTENER =
    *(SID_LIST =*)
    *(SID_DESC =*)
    * (SID_NAME = PLSExtProc) *.
    * (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)*
    * (= Extproc program) *.
    *)*
    *(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) *.
    *)*
    *)*

    customer listener.ora (orcl)

    SID_LIST_LISTENER =
    *(SID_LIST =*)
    *(SID_DESC =*)
    * (SID_NAME = PLSExtProc) *.
    * (ORACLE_HOME = E:\Sample1oracle\product\10.2.0\db_2)*
    * (= Extproc program) *.
    *)*

    *)*

    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)) *.
    *)*

    Customer 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) *.
    *)*
    *)*

    user11345217 wrote:
    I'm confused verymuch is a client/server configuration.
    I need help you popular.
    I posted the two clients/Server Listener and tnsnames .ora,
    that I set up.

    Server listener.ora (test1)

    SID_LIST_LISTENER =
    *(SID_LIST =*)
    *(SID_DESC =*)
    * (SID_NAME = PLSExtProc) *.
    * (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)*
    * (= Extproc program) *.
    *)*
    *(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, it's certainly the most, uh, listener.ora interesting I've ever seen... where did you find with this?

    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) *.
    *)*
    *)*

    customer listener.ora (orcl)

    A listener.ora on the client makes as much sense as a radiator on a 1965 Volkswagen. The listener is strictly a process on the server side. That's the whole reason to live is to 'listen' (where its name) for connection requests.

    Customer 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 up a few things.

    First of all, as mentioned, the listener is purely a process on the client side. There is therefore no use to a listener.ora on the client.

    Second, a single listener, listening on a single port, can serve several databases multiple editions in multiple oracle homes. He listens to a connection, it puts in place (on a different listening port on) and then is out of the picture for this connection. It establishes the connection, but not the support it. Your listener.ora is much more complex (dare I say convoluted) as necessary.

    On the client side (the server can also act as a client) and the tnsnames.ora is used to resolve an alias (a tns service name) to a real destination on the network.

    Suppose 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@larry

    TNS will appear in your tnsnames.ora for an entry called "larry". Then, tns sends a request to (PORT = 1521) on (HOST = myhost) to aid (PROTOCOL = TCP), requesting a connection to (SERVICE_NAME = curley).

    Where's (HOST = myhost) on the network? When the request is passed to tns to the next layer in the network stack, the name "myhost" resolves to an IP address, either via a file 'hosts' local, through DNS, or possibly other mechanisms being used less. Alternatively, you can hard-code the IP (HOST = 123.456.789.101) in the tnsnames.ora.

    Then, the request arrives (port = 1521) on (HOST = myhost). If all goes well, there is a listener on myhost configured to listen on (PORT = 1521), and this listener knows (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 file. In this 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 cannot place a phone call because you do not know the number (can't phone your telephone book or can't find the group you're looking for it contained therein) you don't look at problems at the switchboard.

    Perhaps the entry for larry was found, but myhost could not be resolved to an IP address (for example there is no entry for myhost in the local hosts file). This will mean by "ORA-12545: Connect failed because target host or object does not exist.

    Maybe there is an entry for MyServer in the local hosts file, but it specified a bad IP address. This will mean by "ORA-12545: Connect failed because target host or object does not exist.

    Maybe the INVESTIGATION period was good, but there is no listener running: "ORA-12541: TNS:no listener.

    Maybe the INVESTIGATION period was good, there is a listener to myhost, but he is listening on a different port. "ORA-12560: TNS:protocol adapter error.

    Maybe the INVESTIGATION period was good, there is a listener to myhost, listening on the specified port, it's unknown SERVICE_NAME = curley. "ORA-12514: TNS:listener is not currently of service requested in connect descriptor.

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    Hemant K Collette
    http://hemantoracledba.blogspot.com

    Published by: Hemant K grapple on November 6, 2008 09:31
    corrected "orcl" to "myodb.

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