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A connect identifier is closely related to the connect descriptor. You can use the connect descriptor as your connect identifier, or you can simply map a database service name to a connect descriptor. For example, you can take a service name such as sales and map it to the connect descriptor you saw in the previous section. Here s an example showing the mapping of the sales connect identifier: sales= (DESCRIPTION (ADDRESS=(PROTOCOL=tcp) (HOST=sales-server) (PORT=1521)) (CONNECT_DATA= (SERVICE_NAME=sales.us.acme.com)))
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You connect to a database by providing a connect string. A connect string contains a username/ password combination and a connect identifier. One of the most common connect identifiers is a net service name, which is a simple name for a database service. The following example shows a connect string that uses a complete connect descriptor as the connect identifier: CONNECT scott/tiger@(DESCRIPTION= (ADDRESS=(PROTOCOL=tcp) (HOST=sales_server1) (PORT=1521)) (CONNECT_DATA=(SERVICE_NAME=sales.us.acme.com))) Here s a much easier way to connect to the same database, using the connect identifier sales: CONNECT scott/tiger@sales Both of the preceding examples will connect you to the sales database, but obviously the second connect string (using the sales connect identifier) is much simpler.
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CHAPTER 10 CONNECTIVITY AND NETWORKING
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Oracle Net provides you with several GUI and command-line tools to configure connections between clients and database services. The most common command line you ll probably use is the lsnrctl utility, which helps manage the Oracle listener service. The following are the important GUI tools that help you manage Oracle Net Services. Oracle Net Configuration Assistant (NCA): This tool is used mostly to configure network components during installation, and it enables you to select one of the available options (I discuss these options later in the chapter) to configure client connectivity. The easy-to-use GUI interface enables you to quickly configure client connections under any naming method you choose. On UNIX/Linux systems, you can start NCA by running netca from the $ORACLE_HOME/bin directory. On Windows, choose Start Programs Oracle - HOME_NAME Configuration and Migration Tools Net Configuration Assistant. Oracle Net Manager: Oracle Net Manager can be run on clients and servers, and it allows you to configure various naming methods and listeners. With this tool, you can configure connect descriptors in local tnsnames.ora files or in a centralized OID, and you can easily add and modify connection methods. To start Oracle Net Manager from the Oracle Enterprise Manager console, select Tools Service Management Oracle Net Manager. To start Oracle Net Manager as a stand-alone application on UNIX, run netmgr from $ORACLE_HOME/bin. On Windows, choose Start Programs Oracle - HOME_NAME Configuration and Migration Tools Net Manager. Oracle Enterprise Manager: OEM in Oracle Database 10g can do everything that the Oracle Net Manager can do, but for multiple Oracle homes across multiple file systems. In addition, using the OEM, you can export directory naming entries to a tnsnames.ora file. Oracle Directory Manager: This powerful tool enables you to create the various domains and contexts necessary for using OID. You can also perform password policy management and many Oracle advanced security tasks with this tool. On UNIX/Linux systems, you can start OID by running oidadmin from the $ORACLE_HOME/bin directory. On Windows, choose Start Programs Oracle - HOME_NAME Integrated Management Tools Oracle Directory Manager.
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Establishing Oracle Connectivity
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In order to connect to an Oracle database using the network, you must first establish a network connection between your client and the server. You must have either the Oracle Client or the Oracle Database Server software installed on the machine you re making the connection from. I explain the installation of the Oracle Client software in the following section. Here are the steps you must take to make a successful connection: 1. Make sure the database server is installed and the Oracle instance is running. 2. Make sure that your Oracle Client software is installed on the client machine. 3. Check that the database server and client are running on the same network. Check this by using the ping command: C:\> ping prod1 Pinging prod1.netbsa.org Reply from 172.14.152.1: Reply from 172.14.152.1: Reply from 172.14.152.1: Reply from 172.14.152.1: [172.14.152.1] with 32 bytes of data: bytes=32 time<1ms TTL=255 bytes=32 time<1ms TTL=255 bytes=32 time<1ms TTL=255 bytes=32 time<1ms TTL=255
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