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Oracle Net Services consists of Oracle Net, Oracle Net Listener, Oracle Connection Manager, Oracle Net Configuration Assistant, and Oracle Net Manager The Oracle Net Services software is installed automatically as part of the Oracle Database Server or the Oracle Client software installation Oracle Net is a software component that initiates, establishes, and maintains connections between clients and servers That s why Oracle Net must be installed on both the client and the server.

Oracle Net consists mainly of two components: Oracle Network Foundation Layer: Responsible for establishing and maintaining the connection between the client application and the server, as well as exchanging messages between them Oracle Protocol Support: Responsible for mapping Transparent Network Substrate (TNS) functionality to industry-standard protocols used in connections All servers that host an Oracle database also run a service called the Oracle Net Listener (commonly referred to as just the listener), whose main function is to listen for requests from client services to log into the Oracle database The listener, after ensuring that the client service has the matching information for the database (protocol, port, and instance name), passes the client request on to the database The database will allow the client to log in, provided the username and password are authenticated.

Once the listener hands off the user request to the database, the client and the database will be in direct contact, without any help from the listener service Oracle provides a number of GUI-based utilities to help configure network connections for your databases These utilities include the Oracle Connection Manager, Oracle Net Manager, and Oracle Net Configuration Assistant These tools can help you take care of all your networking needs After you finish reading this chapter, just click these program icons and start experimenting with test connections..

The client system makes use of only one user-defined type in method calls. The class is called PricedItem and is defined in a component called CommonTypes. Most of the classes in the OrderEntry client component are type coupled to CommonTypes. Figure 13-9 shows the details. The following sections show the salient C# and VB .NET code for the client component. This case study dispenses with builders and binders to avoid introducing additional complexity and classes. The FormMain class in each project acts as both a builder and binder.

To make an Internet connection to an Oracle database, the web browser on the client communicates with the web server and makes the connection request using the HTTP protocol. The web server passes the request along to an application, which processes it and communicates with the Oracle database server using Oracle Net (which is configured on both the database server and the client). In the next sections, you ll look at some important terms that are crucial in Oracle networking.

As you know by now, an Oracle instance consists of the SGA and a set of Oracle processes. The database instance name is specified in the initialization file (init.ora) as the INSTANCE_NAME parameter. When you talk about the Oracle system identifier (SID), you are simply referring to the Oracle instance. Normally, each database can have only one instance associated with it. In an Oracle Real Application Clusters (RAC) configuration, however, a single database could be associated with multiple instances.

Figure 13-9. The coupling related to the component containing the system s common user-defined types

The global database name uniquely identifies an Oracle database and is of the format database_ name.database_domain, for example, sales.us.acme.com. In this global database name, sales is the database name and us.acme.com is the database domain. Since no two databases in the same domain could have the same database name, every global database name is unique.