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The ancient medical admonition primum non nocere (first, do no harm) could also serve for us DBAs, when we are confronted with a database that needs recovery or some such critical operation. In critical situations, it s better to gather vital facts and clarify the conceptual basis of your impending changes before actually typing commands in a hurry. Your goal is to resolve the issue at hand, of course, but at a minimum, you shouldn t do any further harm! Slow down, make sure you really understand what s at stake, and then proceed further or call for additional help.

side from dealing with tables and the queries that are based on them, many DBAs don t have a detailed understanding of database topics, such as normalization, functional dependency, and entity-relationship modeling However, a good database is the bedrock on which you can create a good application The ability to design a database is particularly useful to DBAs working in smaller organizations, where they ll need to know how to do everything from working with the UNIX file system to resolving networking issues Even if designing databases isn t a part of your job description, however, understanding database design will help you when performance tuning the database Because the needs of organizations differ, you can t take a one size fits all approach to databases.

Private Function coordinatorOrderEntry_OnGetStyles(ByVal theModel As String) _ As String() Dim styles As String() = New String() {"Style 1", "Style 2", "Style 3"} Return styles End Function Private Sub coordinatorOrderEntry_OnSubmit(ByVal theModel As String, _ ByVal theStyle As String, _ ByVal theColor As Color, _ ByVal theOptions As PricedItem() ) Dim s As String = String.Format("Model=[{0}] Style=[{1}] Color=[{2}]", _ theModel, theStyle, theColor) For i As Integer = 0 To theOptions.Length - 1 s += String.Format(" Option[{0}]=[{1}]", i, theOptions(i).Name) Next MessageBox.Show(s, "Order submitted") End Sub End Class

This makes database design one of the most interesting and challenging areas available to you when working with databases, and large corporate database systems in particular Someone in the organization needs to first model the needs of the organization on a conceptual level and then use this conceptual design to physically design and build the database Even though it s not absolutely necessary that you, as a DBA, be an expert in database design, your knowledge as a competent Oracle DBA isn t complete until you learn at least the rudiments of database modeling and design In this chapter, you ll first learn the conceptual basis of a relational database, which is what an Oracle Database 11g database is After you explore the basic elements of the relational database life cycle, you ll learn how to perform conceptual or logical data modeling.

Data normalization is very important when dealing with relational databases, and this chapter discusses this topic in detail Finally, you ll learn how to translate the logical data model into a design you can physically implement Oracle Corporation refers to its databases as object-relational databases, so the chapter concludes with a brief discussion of object-relational databases..

The server side of the system consists of four main components, as shown in the coupling diagram back in Figure 13-3. I distributed the logic across four different components, because a real system might run each component on a different computer in a LAN or WAN environment. The only server component that the client accesses directly is called Order Processing. It contains a class called OrderSystem that is called from the client side over a .NET remoting TCP/IP connection. The other server components are hidden from the client. Each component is associated with its own MSMQ queue. Figure 13-10 shows the queues related to each server component.

DRCP uses a connection broker that assigns each new client session to an available pooled server Once the client connection s request is served by the database, the connection releases the pooled server back to the server pool Thus, the sessions use memory and other resources only while the database is actually performing tasks for the sessions and release those resources when they release the pooled server back to the pool of servers As long as the database doesn t reach the maximum number of pooled servers, the connection broker will create a pooled server to assign to a new client connection, if it can t find a free pooled server Once the maximum number of pooled servers is reached, the connection broker can t create a new pooled server It sends the client connections to a wait queue until some pooled servers are freed up.