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Creator QR Code in Font The Local Naming Method

The Local Naming Method
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Local naming is the simplest and easiest way to establish Oracle connectivity. Using this method, you store service names and their connect descriptors in a localized configuration file named tnsnames.ora. By default, this file is always stored in the $ORACLE_HOME/network/admin directory. Oracle provides a sample tnsnames.ora file for your use, and you can find it in the default directory. (You can think of the tnsnames.ora file as being similar to the /etc/hosts file, which contains the networking information for UNIX/Linux systems.) The tnsnames.ora file is always present
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CHAPTER 10 CONNECTIVITY AND NETWORKING
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on the client machine; if the database server is also used for client-type connections, there will be a tnsnames.ora file on the server for the other databases you need to connect to from that server. When you initiate a connection by using either the SQL*Plus interface or some other means, you need to provide your username and password for the database you are connecting to. Once you do so, Oracle Net has to figure out which server the database is running on, so it consults the tnsnames.ora file to resolve the network address, the protocol, and the port for the database server. When it successfully resolves these, it initiates contact with the listener on the machine where the database server is located. Once the listener hands off the connection to the database server, the database authenticates your username and password. Once you configure connections using the local naming method, all database connections, whether they are made directly through SQL*Plus or through an application s logon page, will use the tnsnames.ora file to resolve service names. In addition to the tnsnames.ora file, client machines make use of another file called sqlnet.ora when they use the local naming method. The sqlnet.ora file is located on each client and contains import network configuration parameters. (Of course, if a server is used as a client as well, there will be a sqlnet.ora file on the server.) 11 shows how to use the SQLNET.AUTHENTICATION_ SERVICES parameter to configure operating system authentication. Here s a typical sqlnet.ora file: # SQLNET.ORA Network Configuration File: /u01/app/oracle/product/10.2.0/db_1/network/admin/sqlnet.ora # Generated by Oracle configuration tools. NAMES.DEFAULT_DOMAIN = wowcompany.com SQLNET.AUTHENTICATION_SERVICES= (NTS) NAMES.DIRECTORY_PATH= (TNSNAMES) The tnsnames.ora and sqlnet.ora configuration files are usually located in the $ORACLE_HOME/ network/admin directory on UNIX/Linux systems and in the $ORACLE_HOME\network\admin directory on Windows systems. However, you can place these files anywhere you like. If you place them in a nondefault location, you have to use the TNS_ADMIN environment variable to tell Oracle where the files are. Oracle will search for the two files in the following locations, and it will use the first of each it finds: 1. Oracle looks in the directory specified by the TNS_ADMIN environment variable. 2. For the tnsnames.ora file, Oracle will look in the global configuration directory. For a UNIX/Linux system, this is usually the /var/opt/oracle directory. 3. Oracle will look in the standard network directories: $ORACLE_HOME/network/admin on UNIX/Linux systems and $ORACLE_HOME\network\admin on Windows systems.
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Modifying tnsnames.ora Manually
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To configure local naming, you have to edit the tnsnames.ora file provided by Oracle when you create a database. All you need to do is go to the default tnsnames.ora location, $ORACLE_HOME/ network/admin, and edit this file to reflect your network and database service name information. When you add a new database to your system, you also need to physically add the new database service name mapping to each user s tnsnames.ora file or send all your users a new, updated tnsnames.ora file to replace the old one. Listing 10-6 shows a typical tnsnames.ora file. Listing 10-6. A Typical tnsnames.ora File # TNSNAMES.ORA Network Configuration File: /u01/app/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora # Generated by Oracle configuration tools. finance =
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