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Total sales of ProductA in 2009 are forecast as the sum of ProductA sales in the years 2007 and 2008. Total sales of ProductB in the year 2009 are forecast to be the same as the sales in 2008. Total product sales in 2009 are computed as the sum of the ProductA and ProductB sales in 2009. Here s the output generated by using the preceding SQL statement with the MODEL clause: COUNTRY -------Mexico Mexico Mexico Mexico Mexico Mexico Mexico Mexico Mexico Canada Canada Canada Canada Canada Canada Canada Canada Canada PRODUCT -----------ProductA ProductA ProductA ProductA ProductB ProductB ProductB ProductB All_Products ProductA ProductA ProductA ProductA ProductB ProductB ProductB ProductB All_Products YEAR ----2006 2007 2008 2009 2006 2007 2008 2009 2009 2006 2007 2008 2009 2006 2007 2008 2009 2009 SALES --------2474.78 4333.69 4846.3 9179.99 15215.16 29322.89 81207.55 81207.55 90387.54 2961.3 5133.53 6303.6 11437.13 22161.91 45690.66 89634.83 89634.83 101071.96

The SELECT clause first retrieves the product, year, and sales data for the two countries (Mexico and Canada) and feeds it into the MODEL clause. The MODEL clause takes this raw data and rearranges it into a multidimensional array, based on the values of the PARTITION BY (country) and DIMENSION BY (product and year) clauses. After the MODEL clause creates the array, it applies the three formulas listed under the RULES clause to the data. It finally produces the resulting row data, after ordering it by country, product, and year. Note that the MODEL clause shows the original table or view data, as well as the new data that the MODEL clause has calculated.

Let s look at notifications in more detail. A notification is essentially a signal sent when an event occurs. The signal can be sent in two basic ways: by transferring data or by transferring execution control. When the signal transfers data, the signal is a message written to a resource that is shared by the sender and receiver. The shared resource might be a network connection, shared memory, an OS service, a pipe, a computer, or something else. The message can be anything from a single value to a formatted message with fields describing the event. The fields might include a sender identifier, a message identifier, a time stamp, a priority value, or other information related to the event. In order for the notification to have an effect, the receiver must monitor the shared resource and be able to detect any new data written to it. When the signal transfers execution control, the signal is sent as a procedure call. Depending on the relative locations of the sender and receiver, the procedure call might be local or remote. The signal is the call itself, with optional data passed as parameters or returned values. Figure 2-1 shows the steps involved in the production of a notification:

As companies grow, it becomes important to be able to share information among multiple databases and applications. Disparate information-sharing technologies add to the burden of effectively replicating data. The Oracle Streams feature provides a single unified solution for information sharing across the enterprise.

When you use Oracle Streams, each unit of information is called an event, and you share these events in a stream A stream routes specified information to specified destinations The Oracle Streams feature captures changes occurring in the database, using both the active and archived redo logs Streams capture these changes and store them in queues, after proper formatting Streams then propagate these changes to other databases and apply them to the target databases Using the Oracle Streams feature, you can capture, propagate, and apply information within an Oracle database, between two Oracle databases, among multiple Oracle databases, or between an Oracle database and a nonOracle database Using Streams, you can transform the streams of data at any of the three points: during capture of data, during propagation to the target, and during application at the destination site.