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Oracle 8 Tips  

by Burleson Consulting

The Data Warehouse Development Life Cycle

SQL*Net For Oracle Distributed Data Warehouses

SQL*Net can establish database communications in three ways: remote connection, remote request, or distributed request. A remote connection is the easiest way to make a database connection. The sending database simply makes a request by specifying a table name suffixed by @. SQL*Net takes it from there, seamlessly accessing the remote database and returning the data to the initiating system. Communication is established by making a distributed request to a remote database. Within Oracle, @ specifies the remote database name, but the functionality of the @ operator depends upon where it is used. Here’s an example:

sqlplus scott/tiger@london



In this request, Scott is using Oracle SQL*Plus SQL command line interface to connect to the London database, and @london is the service name, as defined in the tnsnames.ora file. SQL*Net recognizes this as a remote connection and determines the appropriate linkage to establish communications with London. Internally, Oracle will check the tnsnames.ora file to ensure that london is a valid destination.

This is an excerpt from "High Performance Data Warehousing", copyright 1997. To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:



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