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CHAPTER 10 CONNECTIVITY AND NETWORKING
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If there are multiple Oracle installations on a PC, there may be several tnsnames.ora files on the system as well. A user may be unable to connect to a new database after adding the network configuration information to a tnsnames.ora file if it s not the one in use. Make sure the correct tnsnames.ora file is in the Oracle Client s path.
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Using the TWO_TASK Environment Variable
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You can bypass the use of an Oracle Net name by setting the TWO_TASK environment variable (on UNIX/Linux) or the LOCAL environment variable (on Windows). The TWO_TASK environment variable specifies the connect string for connecting to a remote machine. SQL*Net will check the value of the TWO_TASK environment variable and automatically add it to your connect string, as shown in the following example: $ export TWO_TASK=mydb Once you set the TWO_TASK environment variable, you can connect to the mydb database in the following way: $ sqlplus scott/tiger Note that you didn t have to use the specification sqlplus scott/tiger@mydb, since you re using the TWO_TASK variable. On a Windows server, the following is the equivalent for setting the TWO_TASK environment variable: $ SET LOCAL=<mydb> $ sqlplus scott/tiger
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The Instant Client
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The Oracle Client installation described in the previous section requires you to go through all the preparatory steps needed for a regular Oracle Database Server software installation. As you learned in 7, preparing for the Oracle software installation takes quite a bit of time and effort. Fortunately, you may not always need to install the complete Oracle Client software for connecting to an Oracle database. Oracle s new Instant Client software allows you to run your applications without installing the standard Oracle Client or having an ORACLE_HOME. You don t need to install the Oracle Client software on every machine that needs access to the Oracle database. All existing OCI, ODBC, and JDBC applications will work with the Instant Client. If you wish, you can even use SQL*Plus with the Instant Client. The Instant Client offers the following advantages, as compared to the full-blown Oracle Client software: It is free. It takes less disk space. The installation is faster (five minutes or so). No CD is required. It has all the features of the regular Oracle Client, including SQL*Plus if necessary.
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CHAPTER 10 CONNECTIVITY AND NETWORKING
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Installing the Instant Client
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Here are the steps to install the new Instant Client software and connect quickly to an Oracle database: 1. Download the Instant Client software from the OTN web site. You must install the Basic client package and you can also include any of the advanced optional packages. The packages contain the following items: Basic: Files required to run OCI, OCCI, and JDBC-OCI applications SQL*Plus: Additional libraries and executables for running SQL*Plus with Instant Client JDBC Supplement: Additional support for XA, Internationalization, and RowSet operations under JDBC ODBC Supplement: Additional libraries for enabling ODBC applications with Instant Client (Windows only) SDK: Additional files for developing Oracle applications with Instant Client 2. Unzip the selected packages into a single directory, and name it something like instantclient . 3. In UNIX and Linux systems, set the environment variable LD_LIBRARY_PATH to instantclient (thus making sure the setting for the parameter matches the name of the directory that contains the packages). On Windows systems, set the environment variable PATH to instantclient. 4. Test your connection to the Oracle server.
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The Listener and Connectivity
The Oracle listener is a service that runs only on the server and listens for incoming connection requests. Oracle provides a utility called lsnrctl to manage the listener process. Here s a summary of how the listener fits into Oracle networking: The database registers information about the services, instances, and service handlers with the listener. The client makes the initial connection with the listener. The listener receives and verifies the client connection request and forwards it to the service handler for the database service. Once the listener hands off the client request, the listener is out of the picture for that connection. The listener.ora file, whose default location is the $ORACLE_HOME/network/admin directory on UNIX systems and the $ORACLE_HOME\network\admin directory on Windows systems, contains the configuration information for the listener. Because the listener service is run only on the server, there is no listener.ora file on the client machines. Listing 10-1 shows a typical listener.ora file. All the configuration parameters in listener.ora have default values, and you don t have to configure a listener service manually anymore. After the first database on the server is created, the listener service automatically starts, and the listener configuration file, listener.ora, is placed in the default directory. Upon the creation of a new database, the database s network and service information is automatically added to the listener s configuration file. Upon instance startup, the database registers itself automatically with the listener, and the listener starts listening for connection requests to this database.
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