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In this chapter, we have taken a somewhat anecdotal look at why you need to know the database. The examples I presented are not isolated they happen every day, day in and day out. I observe a continuous cycle of such issues happening, over and over. Let s quickly recap the key points. If you are developing with Oracle: You need to understand the Oracle architecture. You don t have to know it so well that you are able to rewrite the server, but you should know it well enough that you are aware of the implications of using a particular feature. You need to understand locking and concurrency control and that every database implements these features differently. If you don t, your database will give wrong answers and you will have large contention issues, leading to poor performance. Do not treat the database as a black box something you need not understand. The database is the most critical piece of most applications. Trying to ignore it would be fatal. Do not reinvent the wheel. I ve seen more than one development team get into trouble, not only technically but on a personal level, due to a lack of awareness as to what Oracle provides for free. This happens when someone points out that the feature they just spent the last couple of months implementing was actually a core feature of the database all along. Read the Oracle Database Concepts Guide the New Features guide the documentation that comes free with the software!

Following the selection of the NTP time source(s), the next major decision in the NTP design process is to determine the NTP topology at the deployment site. Any decision that involves topology will be driven by the size of the network, specifically the number of clients participating in the NTP exchanges, the need for redundancy in offering the NTP service, and the actual physical layout of the network.

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Solve problems as simply as possible, using as much of Oracle s built-in functionality as possible. You paid a lot for it. Software projects come and go, as do programming languages and frameworks. We developers are expected to have systems up and running in weeks, maybe months, and then move on to the next problem. If you reinvent the wheel over and over, you will never come close to keeping up with the frantic pace of development. Just as you would never build your own hash table class in Java since it comes with one you should use the database functionality you have at your disposal. The first step to being able to do that, of course, is to understand what it is you have at your disposal. Read on.

Private Sub Child_Fetch(ByVal childData As Object) RaiseListChangedEvents = False For Each child In DirectCast(childData, IList(Of Object)) Me.Add(EditableChild.GetEditableChild(child)) Next RaiseListChangedEvents = True End Sub #End Region End Class As you can see, this code is similar to a root collection in structure, though there is no Authorization Rules region. The factory methods are somewhat different, because they are scoped as Friend and call the child data portal methods. Notice that the GetEditableChildList() method requires that the parent provide a preloaded object containing the data for the list s child objects. It is less efficient, but possible, for the child list to go directly to the database in its Child_Fetch() method and load its own data, but typically the parent object provides this data, as mocked up here. The Data Access region contains a Child_Fetch() method, which is responsible for creating all child objects by calling their factory methods, and adding those objects to the collection. As with any collection, the RaiseListChangedEvents property is set to False first and then to True when complete to prevent a flood of unnecessary ListChanged events during the data-retrieval process. The BusinessListBase class contains a default implementation for Child_Update() that automatically calls the right Child_XYZ method on all child objects of the list when the list is saved. Normally this implementation is sufficient, but you can override Child_Update() to customize that behavior if required for some unusual edge case. As with an editable root collection, you can set AllowNew to True and override AddNewCore() if you want data binding to add new items to the collection automatically.

And building on that last point, software projects and programming languages may come and go but the data is here forever. We build applications that use data, and that data will be used by many applications over time. It is not about the application it is about the data. Use techniques and implementations that permit the data to be used and reused. If you use the database as a bit bucket, making it so that all access to any data must come through your application, you have missed the point. You can t ad hoc query your application. You can t build a new application on top of your old application. But if you use the database, you ll find adding new applications, reports, or whatever to be much easier over time.

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