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In this approach Constraint C12 is explicitly declared to the DBMS and the DBMS takes the responsibility for enforcing it. Maintaining the derived data is still the user s responsibility, though. What s more, if the user carries out this task reliably and correctly, the constraint checking will never fail, and it will thus, in effect, constitute pure overhead on the user s updates. But we can t dispense with the constraint, of course, precisely because we need the system to check that the user is carrying out the maintenance task reliably and correctly. By the way, proper support for this approach will require the system to support, and the user to use, multiple assignment in the maintenance task (see 11).

This allows you to quickly enable or disable outgoing and incoming traffic for the ports you will most commonly need to access For another computer to connect to yours, you ll need to know your IP address or the computer name that corresponds to your IP address, and the user will need to know which address to use To find the IP address of your machine, look at the bottom portion of the Sharing pane (Figure 11 1) where the computer name is also displayed Usually when you connect to resources on another computer, you can browse to them using various programs, such as the Finder or Bonjour Browser, and you will see the computer referenced by name This makes things easier for users wanting to connect to your computer from your local network.

Clearly it would be better if, instead of simply declaring the constraint, we could actually inform the system of the rule by which the derived data is defined and have the system perform the derivation process automatically. And we can; that s exactly what the view mechanism does. To be specific, we can replace the base relvar TOTALS by a view of the same name, thus: VAR TOTALS VIRTUAL ( SUMMARIZE PAYMENTS BY { CUST# } ADD ( SUM ( AMT ) AS TOTAL ) ) ; Now the user no longer has to worry about maintaining the derived data; moreover, there s now no way that Constraint C12 can possibly be violated, and there s no need even to state it any more, except perhaps informally (as a means of telling the user the semantics of the view, perhaps). Note, however, that the user does have to be explicitly told not to try to maintain the totals! This fact doesn t mean the user has to be told that relvar TOTALS is a view, though; it just means the user has to be told that the maintenance task will effectively be performed by the system.

Source: /website/ROOT/ajaxrecipes/javascript/makingdecisionsinitialization.html function ClassicalManipulateObject( obj) { info( "ClassicalManipulateObject", "Starting"); if( !didInitialize) { DoInitialization( obj); } else { info( "ClassicalManipulateObject", "no initialization necessary"); } assertEquals( 3, obj.value); info( "ClassicalManipulateObject", "Ending"); } In the example, the bold code relates to the initialization functionality. didInitialize is a flag variable that can be either true or false. If the didInitialize variable is false, then initialization did not take place; if the didInitialize variable is true, then initialization did take place. If initialization did not take place, the DoInitialization function is called. Notice that in the logic is a variable that represents whether initialization has taken place and a function to do initialization. This code is problematic because the variable has to be

However, you might need the IP address when connecting over the Internet or when the name does not appear on its own..

The drawback to the view solution, however, is that the derivation process is performed every time the view is referenced. Thus, if the object of the exercise is (in effect) to do that work at update time in order to improve subsequent query performance, the view solution is clearly inadequate. In that case, we should use a snapshot instead of a view: VAR TOTALS SNAPSHOT ( SUMMARIZE PAYMENTS BY { CUST# } ADD ( SUM ( AMT ) AS TOTAL ) ) REFRESH ON EVERY UPDATE ; The snapshot concept has its origins in a paper by Michel Adiba ( Derived Relations: A Unified Mechanism for Views, Snapshots, and Distributed Data, Proc. 1981 Int. Conf. on Very Large Data Bases, Cannes, France, September 1981; see also the earlier version Database Snapshots, by Michel E. Adiba and Bruce G. Lindsay, IBM Research Report RJ2772, March 7th, 1980). Basically, snapshots, like views, are derived relvars; unlike views, however, they re real, not virtual that is, they re represented not just by their definition in terms of other relvars, but also (at least conceptually) by their own separately materialized copy of the data.24 In other words, defining a snapshot is much like executing a query, except that: a. The result of the query is kept in the database under the specified name (TOTALS in the example) as a read-only relvar (read-only, that is, apart from the periodic refresh see point b. immediately following). b. Periodically (ON EVERY UPDATE in the example) the snapshot is refreshed that is, its current value is discarded, the query is executed again, and the result of that new execution becomes the new snapshot value.