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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html lang="en-us"> <head> <title>Oracle Net Connectivity Overview</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="topic-id" content="Net_Connectivity_Overview"> <link rel="stylesheet" href="blafdoc.css" type="text/css"> <meta name="Description" content="enter description here..."> <style type="text/css"> <!-- .style1 {font-size: 9px} --> </style> </head> <body><h1>Oracle Net Connectivity Overview</h1> <p>Oracle Net enables connections to various services, such as Oracle databases, non-Oracle databases, gateways, and <a href="external_procedures.htm">external procedures</a>.</p> <p>Users initiate a connect request by passing a user name and password along with an identifier for the service to which they wish to connect. That identifier, called a <a href="connect_identifier.htm">connect identifier</a>, identifies:</p> <ul> <li> <p>The destination service</p> </li> <li> <p>The path, or network route, across the network to get to that service</p> </li> </ul> <p>A connect identifier is specified in several different ways. One of the most common ways is through use of a <a href="net_service_name.htm">net service name</a>, another name for the service, which maps to a <a href="connect_descriptor.htm">connect descriptor</a>. A connect descriptor contains destination service and network route information. The desired service is indicated by using its service name for Oracle8 i or later release databases or its Oracle System Identifier (SID) for Oracle8 databases. The network route provides, at a minimum, the location of the listener through use of a network address.</p> <p>The following shows a net service name called sales mapped to a connect descriptor:</p> <p><span class="Code">sales=</span><br> <span class="Code">(DESCRIPTION=</span><br> <span class="Code">  (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server1)(PORT=1521))</span><br> <span class="Code">  (CONNECT_DATA=(SERVICE_NAME=sales.us.example.com))</span></p> <p>The listener, located on <span class="Code">sales1-server</span>, listens with the TCP/IP protocol on port 1521 for connection requests for a database service called <span class="Code">sales.us.example.com</span>.</p> <p>The connect identifier and its connect descriptor is stored in at least one <a href="naming_method.htm">naming method</a>. During a connection request, the client contacts a naming method to resolve the connect identifier (<span class="Code">sales</span> in the previous example) to a connect descriptor. The client then contacts the listener specified in the connect descriptor.</p> <p>The listener, through a protocol, accepts the client connection. It compares the client information with the information it has received from the database service through <a href="service_registration.htm">service registration</a>, as well as information it has stored in its own configuration file, <a href="listenerora_file.htm">listener.ora</a>. If the information matches, a connection is granted.</p> <h2>Related Topics</h2> <p><a href="net_configuration_overview.htm">Oracle Net Services Configuration Overview</a></p> <P CLASS="zz-legal-notice">Copyright © 1996, 2009, Oracle and/or its affiliates. All rights reserved.<BR> Oracle is a registered trademark of Oracle Corporation and/or its affiliates. <BR>Other names may be trademarks of their respective owners.</p> </body> </html>
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