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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>database link</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="topic-id" content="n8ahelpdatabase_link"> <link rel="stylesheet" href="blafdoc.css" type="text/css"> </head> <body> <h1>database link</h1> <p>A pointer that defines a one-way communication path from an Oracle database server to another database server. The link pointer is actually defined as an entry in a data dictionary table. To access the link, you must be connected to the local database that contains the data dictionary entry.</p> <p>A database link connection is one-way in the sense that a client connected to local database A can use a link stored in database A to access information in remote database B, but users connected to database B cannot use the same link to access data in database A. If local users on database B want to access data on database A, then they must define a link that is stored in the data dictionary of database B.</p> <p>The following database link types are supported:</p> <ul> <li> <p>A private database link in a specific schema of a database. Only the owner of a private database link can use it.</p> </li> <li> <p>A public database link for a database. All users in the database can use it.</p> </li> </ul> <p>For mores information about creating private and public database links, see <em>Oracle10i Database Administrator's Guide</em>.</p> <h2>Related Topics</h2> <p><a href="n8ahelpnet8_overview.htm">Oracle Net Services 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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